X-ray imaging device and control method thereof

Abstract

An X-ray imaging apparatus and a control method thereof set various types of parameters related to X-ray imaging including an X-ray radiation region using a camera image and automatically controls X-ray imaging. An X-ray imaging apparatus includes a capturing unit that captures a camera image, an X-ray source on which a collimator that adjusts an X-ray radiation region is mounted, a storage unit that maps and stores an X-ray imaging region for each of a plurality of X-ray imaging protocols, an input unit that receives a selection of one of the plurality of X-ray imaging protocols, and a control unit that extracts an X-ray imaging region mapped with the selected X-ray imaging protocol from the camera image and controls the collimator so that the X-ray radiation region corresponds to the extracted X-ray imaging region.

Description

[0001] This application is a divisional application of the patent application filed on August 25, 2016, with application number 201610728357.0 and entitled "X-ray Imaging Equipment and Control Method Thereof". Technical Field

[0002] Embodiments of this disclosure relate to X-ray imaging equipment and control methods thereof. Background Technology

[0003] X-ray imaging equipment is used to irradiate an object with X-rays and analyze the X-rays that have passed through the object to identify its internal structure. Because X-ray transmittance varies depending on the tissue that forms the object, the attenuation coefficient (i.e., the numerical value of X-ray transmittance) can be used to image the internal structure of the object.

[0004] Since the X-ray radiation area can be adjusted using a collimator, the X-ray radiation area should be set accurately, taking into account the X-ray imaging section, the characteristics of the object, etc., to prevent the object from being unnecessarily exposed to X-rays and unnecessarily irradiated by X-rays.

[0005] In some cases, due to various reasons (including situations where the X-ray radiation area is smaller than the part to be imaged and situations where the X-ray detection area is smaller than the part to be imaged), it is not possible to completely capture the part to be imaged in a single imaging session.

[0006] In these cases, an X-ray image of the desired portion can be obtained by dividing the area to be imaged into multiple regions, taking X-ray images of each of the multiple regions, and stitching the acquired X-ray images together. Summary of the Invention

[0007] Therefore, one aspect of this disclosure is to provide an X-ray imaging apparatus and a control method thereof, which uses camera images to set various types of parameters related to X-ray imaging, including the X-ray radiation area, and automatically controls the X-ray imaging.

[0008] Other aspects of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of this disclosure.

[0009] According to an embodiment, an X-ray imaging apparatus includes: a capture unit for capturing camera images; an X-ray source on which a collimator is mounted to adjust the X-ray radiation area; a storage unit for mapping and storing X-ray imaging areas for each of a plurality of X-ray imaging protocols; an input unit for receiving selection of one of the plurality of X-ray imaging protocols; and a control unit for extracting the X-ray imaging area mapped to the selected X-ray imaging protocol from the camera image and controlling the collimator such that the X-ray radiation area corresponds to the extracted X-ray imaging area.

[0010] The input unit can receive from the user selections associated with the X-ray imaging region mapped for each of the plurality of X-ray imaging protocols.

[0011] The X-ray imaging apparatus may also include a display unit that displays a graphic object having an object shape for receiving selections associated with an X-ray imaging area, and displays an imaging window by overlaying an imaging window of the specified X-ray imaging area onto the graphic object.

[0012] When at least one of the position and size of the imaging window is adjusted via the input unit, the control unit can store the region corresponding to at least one of the adjusted position and size of the imaging window as an X-ray imaging region in the storage unit.

[0013] The X-ray imaging apparatus may also include a display unit that displays the camera image and displays the extracted X-ray imaging area by overlaying it onto the camera image.

[0014] The display unit can display a list of protocols for receiving selection of one of the plurality of X-ray imaging protocols, and display a camera image when a camera image display command is input through the input unit.

[0015] The input unit can receive X-ray radiation conditions for each of the plurality of X-ray imaging protocols, and the storage unit can map and store the X-ray radiation conditions for each of the plurality of X-ray imaging protocols.

[0016] When one of the plurality of X-ray imaging protocols is selected, the control unit can perform X-ray imaging by applying X-ray radiation conditions mapped to the selected X-ray imaging protocol.

[0017] According to another embodiment, an X-ray imaging apparatus includes: a display unit that displays a graphical user interface (GUI) for receiving settings for X-ray radiation conditions for each of a plurality of object sizes; a storage unit that maps and stores X-ray radiation conditions for each of the plurality of object sizes based on input; a capture unit that captures camera images; and a control unit that identifies the size of an object shown in the camera image and performs X-ray imaging by applying X-ray radiation conditions mapped to the identified object size.

[0018] The display unit can show the size of the identified object.

[0019] The storage unit can map and store X-ray radiation conditions for each of multiple object sizes and each of the X-ray imaging protocols.

[0020] When one of the plurality of X-ray imaging protocols is selected, the control unit can perform X-ray imaging by applying X-ray radiation conditions that are mapped to the selected X-ray imaging protocol and the size of the identified object.

[0021] According to yet another embodiment, an X-ray imaging apparatus includes: a capture unit for capturing camera images; an X-ray source on which a light source is mounted to radiate an X-ray radiation region with visible light; a control unit for calculating the position of the X-ray radiation region in the camera image based on the coordinate information of the X-ray source, extracting the light radiation region displayed in the camera image that is illuminated by visible light, calculating the position of the extracted light radiation region in the camera image, and determining that calibration is required when the position of the X-ray radiation region and the position of the light radiation region do not match each other; and a display unit for displaying calibration-related information when calibration is required.

[0022] The display unit can display a first X-ray radiation window corresponding to the calculated position of the X-ray radiation area and a second X-ray radiation window corresponding to the calculated position of the light radiation area.

[0023] The control unit can determine that calibration is required when at least one of the positions, shapes, and sizes of the first and second X-ray radiation windows does not match each other.

[0024] When calibration is required, the control unit can calculate calibration parameters based on the difference between the first X-ray radiation window and the second X-ray radiation window.

[0025] The display unit can show the calculated calibration parameters.

[0026] The control unit can automatically perform calibration based on the calculated calibration parameters.

[0027] The control unit can extract the boundary of the X-ray detector shown in the camera image or the mounting unit on which the X-ray detector is mounted to extract the detector boundary line, and can determine whether the X-ray detector and the X-ray source are aligned with each other based on the X-ray radiation window displayed at the location of the calculated X-ray radiation area or the location of the calculated light radiation area.

[0028] When the distances between the multiple vertices forming the X-ray radiation window and the multiple vertices forming the detector boundary line are perfectly matched, the control unit can determine that the X-ray detector and the X-ray source are aligned with each other.

[0029] When the center of the X-ray radiation window and the center of the detector boundary line match each other, the control unit can determine that the X-ray detector and the X-ray source are aligned with each other.

[0030] The display unit can display the detector boundary line and the radiation window by overlaying them onto the camera image.

[0031] The control unit can calculate the moving distance or direction of the X-ray source or X-ray detector used to align the X-ray source and X-ray detector with each other.

[0032] The control unit can move the X-ray source or X-ray detector based on the calculated moving distance or moving direction.

[0033] The display unit can show the calculated moving distance or moving direction.

[0034] The display unit can display the X-ray radiation window at the calculated location of the X-ray radiation area or the calculated location of the light radiation area, and the X-ray imaging device may also include an input unit that receives adjustment commands from the user for adjusting the position or size of the X-ray radiation window.

[0035] When the X-ray radiation window deviates from the boundary of the X-ray detector shown in the camera image or the mounting unit on which the X-ray detector is mounted due to an input adjustment command, the display unit can display the area that deviates from the boundary.

[0036] According to yet another embodiment, an X-ray imaging apparatus generates a single X-ray image by stitching together multiple X-ray images of multiple divided regions. The X-ray imaging apparatus includes: a capture unit for acquiring camera images; an X-ray source equipped with a collimator for adjusting the X-ray radiation region; a display unit for displaying multiple divided windows overlaid on the camera image, the multiple divided windows representing the size and position of the multiple divided regions; and a control unit for controlling the collimator to adjust the width of the X-ray radiation region of at least one of the multiple divided regions.

[0037] The X-ray imaging apparatus may also include an input unit that receives commands for controlling the width of the X-ray radiation area, and the control unit can control the collimator according to the input commands.

[0038] The control unit controls the collimator so that the width of the X-ray radiation area matches the width of the object shown in the camera image.

[0039] The control unit can extract the outline of the object from the camera image and determine the width of the X-ray radiation area based on the boundary between the extracted outline and the background.

[0040] X-ray imaging equipment may also include multiple automatic exposure control (AEC) sensors that control the amount of X-rays radiated from the X-ray source, and the control unit may select one of the multiple AEC sensors based on the width of the adjusted X-ray radiation area.

[0041] According to yet another embodiment, an X-ray imaging device generates a single X-ray image by stitching together multiple X-ray images from multiple divided regions, and includes: a capture unit for capturing camera images; a display unit for displaying camera images; and a control unit for determining whether the overlapping area of ​​the multiple divided regions and the camera images is within a preset portion.

[0042] The control unit can move the overlapping area so that the overlapping area is not in the preset part.

[0043] The display unit can display the overlapping area by overlaying it onto the camera image, and can output a warning to the user when the overlapping area is within a preset portion.

[0044] X-ray imaging equipment may also include an input unit that receives user commands for moving overlapping areas.

[0045] According to an embodiment, a method for controlling an X-ray imaging device includes: mapping and storing an X-ray imaging region for each of a plurality of X-ray imaging protocols; receiving an X-ray imaging protocol selected from the plurality of X-ray imaging protocols; extracting an X-ray imaging region mapped to the selected X-ray imaging protocol from a camera image; and controlling a collimator such that an X-ray radiation region corresponds to the extracted X-ray imaging region.

[0046] Mapping and storing X-ray imaging regions may include: receiving selections from a user associated with the X-ray imaging region for each of the plurality of X-ray imaging protocols; and, based on the input, mapping and storing the X-ray imaging region for each of the plurality of X-ray imaging protocols.

[0047] According to another embodiment, a method for controlling an X-ray imaging apparatus includes: displaying a GUI for receiving X-ray radiation conditions for each of a plurality of object sizes; mapping and storing the X-ray radiation conditions for each of the plurality of object sizes based on input; capturing a camera image; identifying the size of an object shown in the camera image; and performing X-ray imaging by applying X-ray radiation conditions mapped to the identified object size.

[0048] The method may also include displaying the size of the identified object.

[0049] According to yet another embodiment, a method for controlling an X-ray imaging device includes: irradiating an X-ray irradiation area with visible light; calculating the position of the X-ray irradiation area in a camera image based on coordinate information of the X-ray source; extracting a light irradiation area displayed in the camera image that is illuminated by visible light; calculating the position of the extracted light irradiation area in the camera image; and determining that calibration is required when the position of the X-ray irradiation area and the position of the light irradiation area do not match each other; and displaying calibration-related information when calibration is required.

[0050] The method may further include: extracting the boundary of the X-ray detector shown in the camera image or the mounting unit on which the X-ray detector is mounted to extract the detector boundary line, and determining whether the X-ray detector and the X-ray source are aligned with each other based on the calculated position of the X-ray radiation area or the X-ray radiation window displayed at the calculated position of the light radiation area and the extracted detector boundary line.

[0051] The method may further include: displaying an X-ray radiation window at the location of a calculated X-ray radiation region or a calculated optical radiation region, and receiving from a user an adjustment command for adjusting the position or size of the X-ray radiation window.

[0052] The method may further include displaying the area deviating from the boundary of the X-ray detector or the mounting unit on which the X-ray detector is mounted, as shown in the camera image due to an input adjustment command.

[0053] According to yet another embodiment, a method for controlling an X-ray imaging apparatus includes: capturing a camera image; displaying the plurality of segmented windows by overlaying them onto the camera image, the plurality of segmented windows representing the size and position of the plurality of segmented regions; and controlling a collimator to adjust the width of an X-ray radiation region of at least one of the plurality of segmented regions.

[0054] The method may further include an input unit for receiving commands for controlling the width of the X-ray radiation region, and controlling the collimator may include controlling the collimator according to the input commands.

[0055] The collimator control may include: a collimator control that makes the width of the X-ray radiation region match the width of the object shown in the camera image. The method may further include: selecting at least one of a plurality of AEC sensors for each of the plurality of segmented regions based on the width of the adjusted X-ray radiation region.

[0056] According to another embodiment, a method for controlling an X-ray imaging device includes: capturing a camera image; displaying the camera image; displaying the plurality of segmented regions by overlaying the plurality of segmented regions, in which stitching imaging will be performed, onto the camera image; and determining whether the overlapping area of ​​the plurality of segmented regions and the camera image is within a preset portion.

[0057] The method may further include: moving the overlapping area when the overlapping area is in a preset portion. Attached Figure Description

[0058] These and / or other aspects of this disclosure will become clearer and more readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a control block diagram of an X-ray imaging apparatus according to an embodiment; Figure 2A This is an external view showing the construction of an X-ray imaging apparatus according to an embodiment; Figure 2B This is an external view showing the sub-display device mounted on the X-ray source; Figure 3A This is a view showing the construction of the collimator; Figure 3B It is along Figure 3A A transverse sectional view of the blade taken by line A-A' in the diagram; Figure 4Showing the X-ray source as viewed from the front; Figure 5A and Figure 5B These are all views illustrating examples of automatic exposure control (AEC) sensors that can be used in X-ray imaging apparatus according to embodiments; Figure 6 and Figure 7 These are all views showing examples of images displayed on the display unit of an X-ray imaging apparatus according to an embodiment; Figure 8A It is a conceptual view showing the light radiating from an X-ray source, representing the region of X-ray radiation; Figure 8B This is a view showing an example of a camera image displayed on a display unit that includes a region of light radiation; Figure 9 This is a view showing an example of an X-ray radiation window displayed based on the area of ​​light radiation; Figure 10 This is a view showing the X-ray radiation window generated using coordinate information and the X-ray radiation window generated through image processing; Figure 11 , Figure 12 , Figure 13 , Figure 14 and Figure 15 This is a view illustrating a method of aligning the X-ray source and X-ray detector of an X-ray imaging apparatus according to an embodiment with each other; Figure 16 This is a view showing an example of an X-ray radiation window displayed on a display unit of an X-ray imaging apparatus according to an embodiment being offset from the boundary of an X-ray detector; Figure 17 , Figure 18 and Figure 19 This is a view showing an example of a pre-defined imaging area according to an imaging protocol; Figure 20 It is a view that shows the information stored in the storage unit; Figure 21 This is a view showing the process of extracting the imaging region corresponding to the imaging protocol from the image of an object; Figure 22 It is a view showing the camera image displayed in the extracted imaging area; Figure 23 It is a view that displays preset information related to the object size; Figure 24 It is a view that displays pre-stored information related to the object's size; Figure 25 It is a view showing the screen through which X-ray radiation conditions can be set for each of the multiple dimensions of the object; Figure 26 This is a view showing the operation of automatically determining the size of an object based on camera images; Figure 27 This is a view showing an example of images stitched together; Figure 28 This is a view showing an example of dividing the imaging region to perform stitched imaging; Figure 29 It is a view showing the overlapping areas between each of the multiple divided regions; Figure 30 and Figure 31 This is a view showing the operation of automatically adjusting overlapping areas; Figure 32 and Figure 33 This is a view related to the case where the user directly specifies the splicing area; Figure 34A , Figure 34B , Figure 35 and Figure 36 It is a view showing a screen that allows a user to set the width of the X-ray radiation area of ​​each of a plurality of divided regions in an X-ray imaging apparatus according to an embodiment; Figure 37 and Figure 38 This is a view showing a screen that allows a user to select an AEC sensor in an X-ray imaging apparatus according to an embodiment; Figure 39A , Figure 39B and Figure 39C This is a view relating to the case where stitched imaging is performed by controlling the tilt angle of an X-ray source in an X-ray imaging apparatus according to an embodiment; Figure 40 This is a view showing the operation of using camera images to determine the movement of an object; Figure 41 and Figure 42 This is a view showing the control measures in the case where stitching is stopped after partial completion of the segmentation imaging and then re-imaging is performed; Figure 43 This is a flowchart illustrating an example of a method for verifying an X-ray radiation region in a method for controlling an X-ray imaging apparatus according to an embodiment; Figure 44 This is a flowchart illustrating an example of a method for aligning an X-ray source and an X-ray detector with each other in a method for controlling an X-ray imaging apparatus according to an embodiment; Figure 45 This is a flowchart related to the method of setting an imaging protocol in a method for controlling an X-ray imaging apparatus according to an embodiment; Figure 46This is a flowchart related to a method for determining whether segmentation imaging has stopped based on the motion of an object in a method for controlling an X-ray imaging apparatus according to an embodiment; Figure 47 This is a flowchart relating to the restart of stitching imaging in a method for controlling an X-ray imaging apparatus according to an embodiment; Figure 48 This is a flowchart related to a method for controlling an overlapping region in a method for controlling an X-ray imaging apparatus according to an embodiment; and Figure 49 This is a flowchart related to a method for controlling a preset object size in an X-ray imaging apparatus according to an embodiment. Detailed Implementation

[0059] Hereinafter, embodiments relating to an X-ray imaging apparatus and its control method according to one aspect will be described in detail with reference to the accompanying drawings.

[0060] In the following description, the same reference numerals are used for the same elements, even in different figures. The matters defined in the description (such as specific constructions and elements) are provided to aid in a comprehensive understanding of the exemplary embodiments. However, it will be apparent that exemplary embodiments may be implemented without these defined matters. Furthermore, known functions or constructions will not be described in unnecessary detail, as they would obscure the description.

[0061] Figure 1 This is a control block diagram of an X-ray imaging apparatus according to an embodiment. Figure 2A This is an external view showing the construction of an X-ray imaging apparatus according to an embodiment. Figure 2B This is an external view showing the sub-display device mounted on the X-ray source. Figure 2A The exterior shown is an example of an X-ray imaging device and relates to a roof-mounted X-ray imaging device in which the X-ray source is connected to the roof of the examination room.

[0062] Reference Figure 1According to an embodiment, the X-ray imaging apparatus 100 includes: an X-ray source 110 that generates and radiates X-rays; a display unit 150 (e.g., a display, display device, monitor, or screen) that displays a screen for setting object size, a screen for setting an imaging protocol, an image captured by a capture unit 120 (e.g., an imaging device, camera, etc.), a screen for setting X-ray radiation conditions, etc.; an input unit 160 that receives control commands from a user, wherein the control commands include commands for setting object size, commands for setting an imaging protocol, commands for setting X-ray radiation conditions, etc.; a storage unit 170 that stores information related to object size, imaging protocol, and X-ray radiation conditions, etc.; and a control unit 140 (i.e., a controller) that controls the overall operation of the X-ray imaging apparatus 100.

[0063] In addition, the X-ray imaging device 100 may also include a communication unit 130 for communicating with external devices.

[0064] The control unit 140 can control the timing of X-ray radiation from the X-ray source 110, X-ray radiation conditions, etc., according to commands input by the user, and can use data received from the X-ray detector 200 to generate medical images.

[0065] In addition, the control unit 140 can also control the position or orientation of the mounting units 14 and 24 on which the X-ray source 110 or X-ray detector 200 is mounted, according to the imaging protocol and the position of the object P.

[0066] The control unit 140 may include a memory and a processor, wherein the memory stores a program for performing the operations described above and below, and the processor executes the stored program. The control unit 140 may include a single processor or microprocessor, or multiple processors or microprocessors. In the latter case, the multiple processors or microprocessors may be integrated on a single chip or physically separated from each other.

[0067] When the control unit 140 includes multiple processors and multiple memories, some of these memories and processors may be located in a workstation (180) and the remaining memories and processors may be located in a sub-display device (80, see below). Figure 2A ) or mobile bracket (40, see Figure 2A In other devices, for example, a processor located in workstation 180 may perform controls such as image processing to generate medical images, and a processor located in a sub-display device or a movable bracket may perform controls related to the movement of X-ray source 110 or X-ray detector 200.

[0068] X-ray imaging equipment 100 can be connected to external devices (e.g., external server 310, medical device 320, portable terminal 330 (such as smartphone, tablet PC and wearable device)) via communication unit 130 and send or receive data with them.

[0069] The communication unit 130 may include one or more elements capable of communicating with external devices. For example, the communication unit 130 may include at least one of a short-range communication module, a wired communication module, and a wireless communication module. In addition, the communication unit 130 may also include an internal communication module that enables communication between X-ray imaging devices 100.

[0070] In addition, the communication unit 130 can receive control signals from external devices and send the received control signals to the control unit 140, so that the control unit 140 can control the X-ray imaging device 100 according to the received control signals.

[0071] Additionally, the control unit 140 can also send control signals to an external device via the communication unit 130, and control the external device based on the control signals received from the control unit 140. For example, the external device can process data based on the control signals received from the control unit 140 via the communication unit 130. Since a program capable of controlling the X-ray imaging equipment 100 can be installed in the external device, the program can include instructions to perform some or all of the operations of the control unit 140.

[0072] The program can be pre-installed on the portable terminal 330, or it can be downloaded from a server that provides the application and installed by the user of the portable terminal 330. The server that provides the application may include a recording medium storing the corresponding program.

[0073] Reference Figure 2A A guide rail 30 can be installed on the roof of the examination room where the X-ray imaging equipment 100 is located. The X-ray source 110 can be connected to a movable bracket 40. The movable bracket 40 moves along the guide rail 30 to move the X-ray source 110 to a position corresponding to the object P. The movable bracket 40 and the X-ray source 110 can be connected by a column frame 50 to adjust the height of the X-ray source 110.

[0074] Since the X-ray source 110 can be moved automatically or manually, the X-ray imaging apparatus 100 may also include a drive unit such as a motor, which provides power to allow the X-ray source 110 to move when it moves automatically.

[0075] The workstation 180 can be located in a space separated from the space where the X-ray source 110 is located by a protective curtain B. The workstation 180 may include an input unit 181 for receiving commands from the user and a display unit 182 for displaying information.

[0076] The input unit 181 can receive commands for controlling imaging protocols, X-ray radiation conditions, the time point of X-ray radiation, the position of the X-ray source 110, etc. The input unit 181 may include a keyboard, mouse, touch screen, voice recognition device, etc.

[0077] The display unit 182 can display screens to guide the user in input, X-ray images, screens showing the status of the X-ray imaging device 100, etc.

[0078] At the same time, refer to Figure 1 The described display unit 150 and input unit 1600 can be implemented as display unit 182 and input unit 181 respectively provided in workstation 180, or as sub-display unit 81 and sub-input unit 82 respectively provided in sub-display device 80, or as display unit and input unit provided in mobile device such as tablet PC and smartphone.

[0079] The X-ray detector 200 can be implemented as a fixed X-ray detector fixed to the bracket 20 or the stage 10, which can be detachably mounted on the mounting units 14 and 24, or it can be implemented as a portable X-ray detector that can be used in any location. The portable X-ray detector can be implemented as a wired or wireless type depending on the method of data transmission and power supply.

[0080] Since the X-ray detector 200 can also be moved automatically or manually, the X-ray imaging apparatus 100 may also include a drive unit such as a motor, which provides power to allow the X-ray detector 200 to move when it moves automatically.

[0081] The X-ray detector 200 may or may not be included as a component of the X-ray imaging device 100. In the latter case, the user may register the X-ray detector 200 with the X-ray imaging device 100. Additionally, in both cases, the X-ray detector 200 may be connected to the control unit 140 via the communication unit 130 to receive control signals or transmit image data.

[0082] A sub-display device 80 that provides information to the user and receives commands from the user may be located on one side of the X-ray source 110, and some or all of the functions performed by the input unit 181 and the display unit 182 of the workstation 180 may be performed by the sub-display device 80.

[0083] When all or some of the components of the control unit 140 and communication unit 130 are set separately from the workstation 180, the components may be included in the sub-display device 80 located at the X-ray source 110.

[0084] Users can manipulate Figure 2B The sub-input unit 82 or touch shown in the figure Figure 2B The sub-display 81 shown in the figure allows input of various types of information or commands related to X-ray imaging.

[0085] For example, a user can input the location to be moved by the X-ray source 110 through the sub-input unit 82 and the sub-display 81.

[0086] although Figure 2A A fixed X-ray imaging device connected to the roof of the examination room is shown, but the X-ray imaging device 100 may include X-ray imaging devices with various structures (such as C-arm X-ray imaging devices and mobile X-ray imaging devices) within the range that will be obvious to a person skilled in the art.

[0087] Meanwhile, the X-ray source 110 may include: an X-ray tube for generating X-rays; a collimator for adjusting the area to be irradiated by the X-rays generated by the X-ray tube; and a capture unit 120 for capturing camera images. This will be described in detail below with reference to the accompanying drawings.

[0088] Figure 3A This is a view showing the construction of the collimator. Figure 3B It is along Figure 3A The transverse cross-sectional view of the blade taken by line A-A'.

[0089] Reference Figure 3A The collimator 113 may include one or more movable blades 113a, 113b, 113c, and 113d, which are capable of absorbing X-rays due to being formed of a material with a high band gap. The radiation range of the X-rays can be adjusted by moving the one or more blades, and the collimator 113 may also include a motor that supplies power to each of the one or more blades.

[0090] The control unit 140 calculates the amount of movement of each of the one or more blades corresponding to the set X-ray radiation area, and sends a control signal for moving the one or more blades to the collimator 113 by the calculated amount of movement.

[0091] For example, the collimator 113 may include four blades 113a, 113b, 113c and 113d, each having a quadrilateral shape. The first blade 113a and the third blade 113c may move in two directions along the x-axis, and the second blade 113b and the fourth blade 113d may move in two directions along the y-axis.

[0092] In addition, each of the four blades 113a, 113b, 113c and 113d can move independently, or the first blade 113a and the third blade 113c can move together as a group, and the second blade 113b and the fourth blade 113d can move together as a group.

[0093] X-rays can be radiated through the slit R formed by the four blades, and collimation can be performed by passing the X-rays through the slit R. Therefore, in this embodiment, the slit R is referred to as the collimation region, and the X-ray radiation region refers to the area where X-rays that have passed through the collimation region R are incident on the object 1 or the X-ray detector 200.

[0094] Reference Figure 3B Collimator 113 is positioned in front of X-ray tube 111. Here, the direction facing in front of X-ray tube 111 indicates the radiation direction of X-rays. The X-ray radiation region E of X-rays radiated from the focal point 2 of X-ray tube 111 is limited by collimator 113, and X-ray scattering is reduced.

[0095] Of the X-rays radiated from X-ray tube 111, those incident on blades 113a, 113b, 113c, and 113d are absorbed into the blades, while the X-rays that have passed through the collimation zone R are incident on X-ray detector 200. Here, the description will assume that no object exists.

[0096] When X-rays are scattered in the form of a cone beam, the X-ray radiation region E is larger than the collimation region R. The collimation region R can be adjusted by the control unit 140 based on the relationship between the X-ray radiation region E and the collimation region R, so that the X-rays can irradiate the desired range of the X-ray radiation region E.

[0097] Although the collimator 113 has been described in the above example as having four blades in a quadrilateral shape, this is only an example applicable to the X-ray imaging device 100, and the number or shape of the blades included in the collimator 113 is not limited thereto.

[0098] Figure 4 The X-ray source is shown as viewed from the front.

[0099] Reference Figure 4 The collimator 113 can be arranged in front of the X-ray source 110, and the capture unit 120 can be built into the area adjacent to the collimator 113.

[0100] The capture unit 120 can capture video using a camera implemented as a charge-coupled device (CCD) camera or a complementary metal-oxide-semiconductor (CMOS) camera. Alternatively, the capture unit 120 can also capture still images at short intervals.

[0101] While the X-ray source 110 captures an X-ray image of the object, the capture unit 120 captures a real image of the object (e.g., the target). In the embodiments described below, the image captured by the X-ray source 110 will be referred to as an X-ray image, and the image captured by the capture unit 120 will be referred to as a camera image. The captured image may or may not include the object. That is, a camera image can be captured when the object 1 is positioned in front of the X-ray detector 200, and it can also be captured when the object 1 is not present.

[0102] The capture unit 120 can be arranged at a location where it can capture a portion of the object to be imaged using X-rays. For example, the capture unit 120 can be mounted on the X-ray source 110 in the same direction as the direction from which X-rays are radiated from the X-ray source 110. When the capture unit 120 is mounted on the X-ray source 110, the user can more easily set settings related to the X-ray image while viewing the camera image because the deviation between the area shown in the X-ray image and the area shown in the camera image is reduced. The mounting position of the capture unit 120 can be suitably determined within a range that minimizes the deviation between the area shown in the X-ray image and the area shown in the camera image without affecting X-ray imaging.

[0103] Since the housing 110a can be formed in front of the collimator 113, the housing 110a can be made of a material such as transparent resin or glass to minimize its influence on the X-rays radiated from the X-ray tube 111.

[0104] Additionally, a cross-shaped guide line GL can be displayed on the housing 110a formed in front of the collimator 130. When the X-ray radiation region E is irradiated with visible light by the collimator lamp built into the X-ray source 110, the shadow of the guide line GL can be displayed at the center of the X-ray radiation region E, and the user can visually identify the position of the X-ray radiation region E by viewing the shadow of the guide line GL.

[0105] The capture unit 120 can be installed on the internal portion of the housing 110a, such as Figure 4 As shown in the diagram. Alternatively, the capture unit 120 may also be mounted on an external portion of the housing 110a. Here, the capture unit 120 may be mounted on a frame located at the periphery of the housing 110a. However, since embodiments of the X-ray imaging device 100 are not limited to this, the capture unit 120 may be mounted in any location, as long as an image of the object can be captured at that location.

[0106] Alternatively, the capture unit 120 can also be implemented as a stereo camera. In this case, the camera can be positioned both to the left and right of the X-ray source 110. When the capture unit 120 is implemented as a stereo camera, depth information about the camera image can be captured, and this depth information can be used to improve the accuracy of image recognition calculated based on the camera image and the reliability of various types of information.

[0107] Figure 5A and Figure 5B These are views illustrating examples of automatic exposure control (AEC) sensors that can be used in X-ray imaging apparatus according to embodiments.

[0108] To prevent excessive X-ray radiation to the object, the X-ray imaging device 100 can perform AEC (Adjustable Extent Control). For this purpose, an AEC sensor module 26 for detecting X-ray dose can be installed in the mounting unit 24, such as... Figure 5A As shown in the figure. Although the mounting unit 24 of the bracket 20 is used to describe the AEC sensor module 26 in this example, the AEC sensor module may also be located at the mounting unit 14 of the platform 10.

[0109] Figure 5A The mounting unit 24 is shown as viewed from the front. An AEC sensor module 26 may be disposed within the mounting unit 24 and may include multiple AEC sensors 26a, 26b, and 26c that independently detect X-ray dose. For example, each of the AEC sensors may be implemented as an ionization chamber.

[0110] The most accurate AEC can be performed when the AEC sensor is positioned at the center of the X-ray imaging section. Markers Ma, Mb, and Mc, indicating the positions of multiple AEC sensors 26a, 26b, and 26 respectively, can be provided on the surface of the mounting unit 24 to locate the center of the X-ray imaging section at the position corresponding to the AEC sensor or to select the AEC sensor positioned at the center of the X-ray imaging section.

[0111] Despite Figure 5A The provided map shows a total of three AEC sensors (two on top and one on the bottom), but this is just an example. It is possible to set up fewer or more than three AEC sensors, and the AEC sensors can also be arranged in different ways.

[0112] Reference Figure 5B The AEC sensor module 26 can also be positioned in front of the X-ray detector 200. The direction facing in front of the X-ray detector 200 indicates the incident direction of the X-rays. Figure 5B The AEC sensor module 26 is shown positioned in front of the X-ray detector 200 when viewed from the side.

[0113] When X-rays are incident on the AEC sensor, an electric current is generated, and the AEC sensor can send a signal corresponding to the generated current to the control unit 140. The signal sent to the control unit 140 can be an amplified digital signal.

[0114] Based on the transmitted signal, the control unit 140 determines whether the dose of the currently incident X-rays exceeds the critical dose. When the dose of X-rays exceeds the critical dose, a circuit breaker signal can be sent to the high voltage generator 101 (which supplies high voltage to the X-ray tube 111) to stop the generation of X-rays.

[0115] Additionally, a grating can be arranged in front of the AEC sensor module 26 to prevent X-ray scattering. Some of the X-rays radiated from the X-ray source 110 may deviate from their original path by colliding with dust particles in the air or matter forming the object before reaching the X-ray detector 200, resulting in scattering. When the scattered X-rays are incident on the X-ray detector 200, they negatively affect the X-ray image (e.g., reducing the contrast of the X-ray image).

[0116] The grating has a structure in which a protective material (such as lead (Pb) is arranged to absorb X-rays. Among the radiated X-rays, the X-rays that travel in their original direction (i.e., forward-moving X-rays) pass through the portions between the protective materials and are incident on the X-ray detector 200. The scattered X-rays collide with the protective material and are absorbed into the protective material.

[0117] The protective material can be arranged in a linear or cross-shaped structure. Furthermore, the protective material can be tilted in a direction approximating the X-ray radiation direction and can be arranged densely or in parallel.

[0118] Although not shown in the accompanying drawings, a drive unit, including a motor capable of mechanically moving the grating, can be installed within the mounting unit 24. Therefore, the angle or center position of the grating can be adjusted by sending control signals from the outside to the drive unit.

[0119] Meanwhile, although the AEC sensor module 26 is described in the example as being mounted on the mounting unit 24, the AEC sensor module 26 can also be integrated with the X-ray detector 200.

[0120] Figure 6 and Figure 7 These are all views showing examples of images displayed on the display unit of an X-ray imaging apparatus according to an embodiment.

[0121] like Figure 6 As shown, a settings window 151 and a work list 155 for setting X-ray radiation conditions can be displayed on the screen 150a of the display unit 150.

[0122] The work list 155 may include a learning list 155a and a protocol list 155b, from which a learning can be selected and an imaging protocol can be selected from the protocol list 155b. A learning may refer to a set of X-ray images that are related to each other. When any learning is selected from the learning list 155a, the protocol list 155b, from which an imaging protocol can be selected to be applied to the selected learning, is displayed.

[0123] The X-ray imaging area can be modified for each imaging protocol, and appropriate X-ray radiation conditions can be varied for each X-ray imaging area. The imaging protocol can be determined based on the X-ray imaging portion, the object's posture, etc. For example, imaging protocols may include overall anteroposterior (AP), overall posteroanterior (PA), and overall lateral (LAT) views; they may also include chest AP, chest PA, and chest LAT views; and may include long bone AP, long bone PA, and long bone LAT views for long bones (such as leg bones). Additionally, imaging protocols may include upright abdominal imaging.

[0124] A graphical user interface (GUI) in which X-ray radiation conditions can be set can be displayed on the settings window 151. The GUI may include multiple graphical objects that can be used to set various X-ray radiation conditions. In this embodiment, objects displayed on the display unit 150 for providing information or receiving control commands from the user (such as buttons and icons) may all be referred to as graphical objects.

[0125] Since the graphical objects displayed on the settings window 151 are used to receive commands from the user for setting X-ray radiation conditions, the graphical objects can be implemented as buttons corresponding to various X-ray radiation conditions.

[0126] For example, the following buttons may be displayed: tube voltage setting button 151a for receiving tube voltage settings; tube current setting button 151b for receiving tube current settings; and exposure time setting button 151c for receiving X-ray exposure time settings. The user can select each button to set the X-ray radiation conditions to the desired value. Buttons can be selected by clicking or touching, depending on the type of input unit 160.

[0127] According to the embodiment, the tube voltage setting button 151a may include a button for increasing the tube voltage and a button for decreasing the tube voltage, the tube current setting button 151b may include a button for increasing the tube current and a button for decreasing the tube current, and the exposure time setting button 151c may include a button for increasing the exposure time and a button for decreasing the exposure time.

[0128] Additionally, the following buttons may be displayed: a capture position setting button 151d for receiving settings related to whether X-ray imaging will be performed at the support 20 or the stage 10; an object size selection button 151e for receiving selections related to patient size; a collimator setting button 151f for receiving settings related to the size of the collimator 113; an AEC selection button 151g for receiving selections related to the AEC sensor; a sensitivity receiving button 151h for receiving settings related to sensitivity; a button 151i for receiving settings related to density; a grating selection button 151j for receiving selections related to the grating; a filter selection button 151k for receiving selections related to the filter; and a focus selection button 151r for receiving selections related to the focus size.

[0129] These buttons can be implemented as shapes formed by images, letters, symbols, etc. Users can select any shape by moving the cursor and clicking the corresponding shape, or by touching and manipulating the shape. Therefore, the settings corresponding to the selected shape can be changed.

[0130] Simultaneously, when a selection related to patient size is entered, X-ray radiation conditions can be set as default values ​​for the corresponding size. For example, storage unit 170 can store a database to which X-ray radiation conditions for each of multiple patient sizes are mapped.

[0131] When the user selects a patient size, the settings window 151 displays the X-ray radiation conditions (such as tube voltage, tube current, and exposure time) mapped as default values ​​for the corresponding size. The mapped X-ray radiation conditions can be applied without modification, or the user can select the button corresponding to each of the X-ray radiation conditions and reconfigure each of the X-ray radiation conditions as described above. Here, the user can refer to the default X-ray radiation conditions displayed in settings window 151 and reconfigure each of the X-ray radiation conditions.

[0132] Furthermore, the X-ray imaging area can be changed for each imaging protocol, and the appropriate X-ray radiation conditions can be changed for each X-ray imaging area. Therefore, the X-ray radiation conditions can be set differently depending on the imaging protocol selected from the work list 155 and the size of the object selected from the settings window 151.

[0133] The types and arrangement of the graphic objects displayed in the settings window 151 above are illustrative. Depending on the designer's choice, some of the above graphic objects can be omitted, and graphic objects other than those above can be provided for changing the settings. Furthermore, the above graphic objects can be provided in a different arrangement than that shown in the example above.

[0134] Once the X-ray radiation conditions are set, the user can select the Exposure button 151l to perform X-ray imaging and can select the Reset button 151n when attempting to initialize the settings.

[0135] Simultaneously, in order to obtain the information required for performing X-ray imaging, the capture unit 120 can capture camera images while the X-ray source 110 is facing the X-ray detector 200. In this case, the X-ray detector 200, or the mounting units 14 and 24 on which the X-ray detector 200 is mounted, may be covered by the object 1 and are not shown in the camera image. Conversely, when a camera image is captured while the object 1 is not positioned in front of the X-ray detector 200, the X-ray detector 200, or the mounting units 14 and 24 on which the X-ray detector 200 is mounted, can be shown in the camera image. The captured camera image 152 can be displayed on one side of the setting window 151, as shown. Figure 7 As shown in the image.

[0136] Figure 6 The work list 155 and shown in the image Figure 7 The camera images 152 shown can be switched between each other. When the camera image button I is selected while the work list 155 is displayed, the work list 155 can switch to camera image 152, and when the close button 152b is selected while the camera image 152 is displayed, the camera image 152 can switch back to work list 155. Alternatively, when the selected imaging protocol requires stitching, the work list 155 can automatically switch to camera image 152, and then a screen showing the stitched imaging can be displayed.

[0137] Reference Figure 7 The X-ray radiation window B1 can be displayed by overlaying the X-ray detector 200 or the mounting unit 24 shown in the camera image 152. In this example, the X-ray detector 200 is mounted in the mounting unit 24, and the mounting unit 24 is shown in the camera image.

[0138] The X-ray radiation window B1 is a tool used to identify the area of ​​the X-ray detector 200 reached by X-rays radiated from the X-ray source 110 (i.e., the X-ray radiation region E). The control unit 140 can calculate the X-ray radiation region E according to an algorithm described below, and display the X-ray radiation window B1, representing the size and position of the calculated X-ray radiation region E, in the camera image 152 to provide the user with information about the size and position of the calculated X-ray radiation region E. Here, the size and position of the X-ray radiation window B1 are relative to the mounting unit 24 shown in the camera image 152.

[0139] Users can adjust the position, size, or form of the X-ray radiation window B1 displayed on the display unit 150 by inputting predetermined operation commands through the input unit 160, and the control unit 140 can control the collimator 113 to adjust the X-ray radiation area E according to the input operation commands.

[0140] Due to various equipment errors, the X-ray radiation window B1 displayed on the display unit 150 may differ from the actual X-ray radiation area E. In other words, in some cases, the X-ray radiation window B1 may not accurately reflect the position or size of the actual X-ray radiation area E. Therefore, the X-ray imaging device 100 may be subject to verification. Figure 7 Does the X-ray radiation window B1 shown accurately reflect the actual X-ray radiation region E?

[0141] First, the method of displaying the X-ray radiation window B1 on the display unit 150 will be described.

[0142] The control unit 140 can use pre-stored coordinate information of the X-ray imaging device 100 to display the X-ray radiation window B1 on the display unit 150. The control unit 140 may include pre-stored information related to the distance between the X-ray source 110 and the X-ray detector 200, the shape and area of ​​the slit R formed by the collimator 113, the distance from the X-ray tube 111 to the slit R of the collimator 113, or may calculate the above information from pre-stored information.

[0143] The control unit 140 can use the above information to calculate the three-dimensional coordinates of the X-ray radiation region E formed on the surface of the mounting unit 24. The three-dimensional coordinates of the X-ray radiation region E calculated by the control unit 140 correspond to the coordinates in the global coordinate system of the space where the X-ray imaging device 100 is located. The coordinate information of the X-ray radiation region E calculated by the control unit 140 may include at least the coordinates of the vertices of the X-ray radiation region E.

[0144] An X-ray radiation window B1, representing the X-ray radiation region, is displayed by overlaying it onto the camera image 152. Since the X-ray radiation window B1, displayed by overlaying it onto the camera image 152, is based on a two-dimensional coordinate system, the control unit 140 converts the calculated three-dimensional coordinates of the X-ray radiation region E into coordinates based on the two-dimensional image coordinate system.

[0145] in addition, Figure 7The camera image 152 shown is an image acquired by the capture unit 120, whose coordinate system differs from the global coordinate system. Therefore, in order to convert information about the three-dimensional coordinates of the X-ray radiation region E into coordinates based on the two-dimensional image coordinate system described above, the global coordinate system should be converted into the camera coordinate system. That is, the global coordinate system should be converted into the camera coordinate system, and information about the three-dimensional coordinates converted to camera-based coordinates should be converted into coordinates based on the two-dimensional image coordinate system.

[0146] The equation for converting coordinates (X, Y, Z) based on a global coordinate system into coordinates (x, y) based on a two-dimensional coordinate system can be expressed as Equation 1. The control unit 140 can use the relationship between the global and two-dimensional coordinate systems expressed in Equation 1 to convert the three-dimensional coordinates of the X-ray radiation region formed at the X-ray detector 200 into the two-dimensional coordinates of the X-ray radiation window B1 to be displayed on the display unit 150. The control unit 140 can use the two-dimensional coordinates obtained as above to display the X-ray radiation window B1 by overlaying it onto the camera image displayed on the display unit 150.

[0147] Equation 1

[0148] In Equation 1, x and y represent the coordinates of the two-dimensional image sensor (i.e., the coordinates of the image coordinate system), and X, Y, and Z represent the coordinates of the global coordinate system.

[0149] In Equation 1 above, the first matrix on the left includes the internal parameters of the capture unit 120 (such as the focal length and principal point of the capture unit 120) as matrix elements. In Equation 1, fx and fy represent the focal length of the capture unit 120, and cx and cy represent the principal point of the capture unit 120.

[0150] In Equation 1, the second matrix on the right is a matrix that allows the global coordinate system to match the camera coordinate system and includes external parameters of the capture unit 120 (such as the mounting orientation of the capture unit 120) as matrix elements.

[0151] In Equation 1, A represents the rotation angle (roll angle) about the z-axis of the camera coordinate system, B represents the rotation angle (pitch angle) about the x-axis of the camera coordinate system, and C represents the rotation angle (yaw angle) about the y-axis of the camera coordinate system. Additionally, t1, t2, and t3 all represent the translation distance between the camera coordinate system and the global coordinate system.

[0152] Figure 8A This is a conceptual view showing light radiating from an X-ray source, representing the region of X-ray radiation. Figure 8BThis is a view showing an example of a camera image displayed on a display unit that includes a region of light radiation. Figure 9 This is a view showing an example of an X-ray radiation window displayed based on the area of ​​light radiation. Figure 10 This is a view showing the X-ray radiation window generated using coordinate information and the X-ray radiation window generated through image processing.

[0153] Reference Figure 8A The region that matches the X-ray radiation region E can be irradiated with visible light VL by a light source (e.g., a collimator lamp) included in X-ray source 110.

[0154] like Figure 8B As shown, the camera image 152 also shows a light radiation region L generated on the surface of the mounting unit 24 by visible light VL. The control unit 140 can extract the boundary of the light radiation region L from the camera image 152 through image processing and can generate an X-ray radiation window B2 based on the extracted boundary of the light radiation region L, as shown. Figure 9 As shown in the diagram, the resulting X-ray radiation window B2 can be displayed by overlaying it onto the camera image 152. To distinguish the two X-ray radiation windows B1 and B2 from each other, in the embodiments described below, the X-ray radiation window B1 generated using coordinate information may be referred to as the first X-ray radiation window B1, and the X-ray radiation window B2 generated through image processing may be referred to as the second X-ray radiation window B2.

[0155] According to the embodiment, the X-ray imaging apparatus 100 undergoes a calibration process that matches the light radiation area L formed by the collimator lamp with the actual X-ray radiation area E and determines the camera parameters of the capture unit 120 (such as principal point, focal length, and mounting angle) so that the X-ray radiation windows B1 and B2 displayed on the display unit 150 can accurately represent the actual X-ray radiation area E.

[0156] When no errors occur during calibration, the X-ray radiation window B1 generated using coordinate information and the X-ray radiation window B2 generated through image processing are matched to each other, such as... Figure 10 As shown in the diagram. Therefore, when the first X-ray radiation window B1 and the second X-ray radiation window B2 do not match each other, it can be determined that an error has occurred in the above calibration process. Therefore, the control unit 140 performs the following process: by performing a process of comparing the first X-ray radiation window B1 with the second X-ray radiation window B2, it verifies whether an error has occurred in the above calibration process.

[0157] Since the differences in position, shape, and size between the X-ray radiation windows B1 and B2 generated using the two methods described above indicate an error in the calibration process, the control unit 140 can display a message requesting calibration via the display unit 150. Alternatively, the first X-ray radiation window B1 and the second X-ray radiation window B2 can be displayed by overlaying them onto the camera image 152, thus visually representing the mismatch between the two X-ray radiation windows B1 and B2. The user can view this message and re-perform the calibration process described above.

[0158] Additionally, the control unit 140 can calculate the degree of inconsistency when the X-ray radiation windows generated by the two methods described above do not match, and calculate calibration parameters to resolve the inconsistency, instead of displaying a message requesting calibration. Calibration can be performed automatically based on the calculated calibration parameters, and the calibration parameters can be displayed on the display unit 150 to guide the user in performing the calibration.

[0159] The control unit 140 can calculate the focal length and principal point of the capture unit 120 required to resolve the inconsistency based on the inconsistency information, and can also calculate the variables required to transform the global coordinate system into the camera coordinate system.

[0160] Furthermore, in the disclosed embodiments, a deviation occurs due to the difference between the focal point of the capture unit 120 and the focal point of the X-ray tube 111. The control unit 140 can use the inconsistency information to calculate the parameters required to compensate for this deviation. The control unit 140 can use the parameters calculated above to automatically perform calibration or can display the calculated parameters through the display unit 150 to assist the user in performing calibration.

[0161] Simultaneously, before performing X-ray imaging, the X-ray imaging apparatus according to the embodiment can perform a process of aligning the X-ray source 110 and the X-ray detector 200 with each other. This alignment can be achieved by matching the center of the X-ray radiation zone with the center of the X-ray detector 200. Hereinafter, reference will be made to... Figures 11 to 15 This will be described in detail.

[0162] Figures 11 to 15 This is a view illustrating a method of aligning the X-ray source and X-ray detector of an X-ray imaging apparatus according to an embodiment with each other.

[0163] like Figure 11As shown, the control unit 140 generates the X-ray radiation window B3 by using the coordinate information method described above or by extracting the boundary of the X-ray radiation region through image processing, and displays the generated X-ray radiation window B3 by overlaying it onto the camera image 152 captured by the capture unit 120.

[0164] In addition, such as Figure 12 As shown, the control unit 140 generates a detector boundary line B4 representing the boundary of the X-ray detector 200 by using the coordinate information method described above or by extracting the boundary of the X-ray radiation detector 200 shown in the camera image 152 through image processing, and displays the generated detector boundary line B4 by overlaying it onto the camera image 152 captured by the capture unit 120. When the X-ray detector 200 is mounted inside the mounting unit 24 as in this example, the mounting unit 24 shown in the camera image 152 can be used instead of the X-ray detector 200.

[0165] The X-ray radiation window B3 and the detector boundary line B4, displayed by overlaying on camera image 152, can be distinguished from each other by being displayed in different colors. Figures 11 to 15 In the image, the X-ray radiation window B3 is shown as a solid line and the detector boundary line B4 is shown as a dashed line.

[0166] exist Figure 13 and Figure 14 The image shows an example of the detector boundary line B4 and the X-ray radiation window B3 being displayed together on the display unit 150.

[0167] When the interval g between the four vertices of the X-ray radiation window B3 and the four vertices of the detector boundary line B4 corresponding to these four vertices is equal to... Figure 13 As shown in the diagram, the control unit 140 can determine that the X-ray detector 200 and the X-ray source 110 are aligned with each other.

[0168] Available options, when such Figure 4 When the center c1 of the X-ray radiation window B3 and the center c2 of the detector boundary line B4 are aligned with each other, the control unit 140 can determine that the X-ray detector 200 and the X-ray source 110 are aligned with each other.

[0169] When the intervals g2, g3, g4, and g5 between the four vertices of the X-ray radiation window B3 and the four vertices of the detector boundary line B4 corresponding to these four vertices are all different, or as follows: Figure 15When the center c1 of the X-ray radiation window B3 and the center c2 of the detector boundary line B4 do not match each other, the control unit 140 can determine that the X-ray detector 200 and the X-ray source 110 are misaligned. In this case, the control unit 140 can calculate the intervals g2, g3, g4, and g5 between the four vertices of the X-ray radiation window B3 and the four vertices of the detector boundary line B4 corresponding to these four vertices, and calculate the moving distance and direction of the X-ray source 110 or the X-ray detector 200 to match the calculated intervals.

[0170] The control unit 140 can match the interval by moving the X-ray source 110 or the X-ray detector 200 according to the moving distance and moving direction of the X-ray source 110 or the X-ray detector 200 calculated above.

[0171] Alternatively, the control unit 140 may also display the calculated moving distance and direction of the X-ray source 110 or X-ray detector 200 via the display unit 150 to guide the user in moving the X-ray source 110 or X-ray detector 200.

[0172] Alternatively, the control unit 140 can calculate the interval g1 between the center c1 of the X-ray radiation window and the center c2 of the detector boundary line, and based on the calculated interval, can calculate the direction and distance of movement of the X-ray source 110 or X-ray detector 200 to match the center of the X-ray radiation window and the center of the detector boundary line. The control unit 140 can match the center of the X-ray radiation window and the center of the detector boundary line by moving the X-ray source 110 or X-ray detector 200 according to the movement distance of the X-ray source 110 or X-ray detector 200 as calculated above.

[0173] Alternatively, the control unit 140 may also display the calculated direction or distance of movement of the X-ray source 110 or the X-ray detector 200 via the display unit 150 to guide the user in moving the X-ray source 110 or the X-ray detector 200.

[0174] As shown in Figure 15, the moving distance and direction of the X-ray source 110 or the X-ray detector 200 can also be displayed as text, and the X-ray radiation window B3, the detector boundary line B4, the interval between mismatched vertices, the interval between the center c1 of the X-ray radiation window and the center c2 of the detector boundary line can also be displayed as images.

[0175] Meanwhile, when the X-ray source 110 and the X-ray detector 200 are aligned with each other, the user can input a predetermined operation command through the input unit 160 to adjust the position, size, or form of the X-ray radiation window B3 displayed on the display unit 150. For example, the position, size, or form of the X-ray radiation window B3 can be adjusted by dragging its boundaries.

[0176] When the user adjusts the X-ray radiation window B3, the X-ray radiation window B3 will deviate from the boundary of the X-ray detector 200.

[0177] Figure 16 This is a view showing an example of an X-ray radiation window offset from the boundary of an X-ray detector, displayed on a display unit of an X-ray imaging apparatus according to an embodiment.

[0178] like Figure 16 As shown, the X-ray radiation window B3 displayed on the display unit 150 may be partially offset from the boundary of the X-ray detector 200 shown in the camera image 152. Additionally, in this example, the X-ray detector 200 is mounted inside the mounting unit 24, and only the mounting unit 24 is shown in the camera image 152. In this case, whether the X-ray radiation window B3 is offset from the boundary of the mounting unit 24 can be determined.

[0179] Despite Figure 16 The diagram shows a case where the X-ray radiation window B3 is partially off the boundary of the X-ray detector 200, but the X-ray radiation window B3 may also be completely off the boundary of the X-ray detector 200.

[0180] Unnecessary excessive exposure to X-rays occurs when X-ray radiation deviates from the boundary of the X-ray detector 200. When the X-ray radiation window B3 deviates from the boundary of the X-ray detector 200 shown in camera image 152, the control unit 140 can, as shown in the image, [control the device]. Figure 16 The regions B3-2 that deviate from the boundary of the X-ray detector 200 and B3-1 that exist within the boundary of the X-ray detector 200 are shown in different colors to inform the user to prevent excessive exposure to X-rays.

[0181] For example, the control unit 140 may display region B3-1, which exists within the boundary of the X-ray detector 200, in green and region B3-2, which deviates from the boundary of the X-ray detector 200, in red, to inform the user that the X-ray radiation window B3 deviates from the boundary of the X-ray detector 200. For reference, in Figure 15In the example shown, the boundary of the X-ray radiation window B3 that appears within the boundary of the X-ray detector 200 is shown by a solid line, and the boundary of the X-ray radiation window B3 that deviates from the boundary of the X-ray detector 200 is shown by a dashed line to distinguish the two from each other.

[0182] Using different colors or dashed and solid lines to indicate that the X-ray radiation window has deviated from the boundary of the X-ray detector 200 is just an example; sound or vibration from the input unit 160 can also be used. That is, the X-ray imaging device 100 can use various methods based on visual, auditory, or tactile stimuli to inform the user that the X-ray radiation window displayed on the display unit 150 has deviated from the boundary of the X-ray detector 200.

[0183] Meanwhile, in order to determine whether the X-ray radiation window B3 deviates from the boundary of the X-ray detector 200 shown in the camera image 152, the control unit 140 can compare the relationship between the position of the detector boundary line B4 and the position of the X-ray radiation window B3.

[0184] Since X-ray imaging is performed on the X-ray radiation region E, the X-ray radiation region can correspond to the X-ray imaging region. When the X-ray imaging region is specified, the control unit 140 can control the collimator 113 to match the X-ray radiation region E with the specified X-ray imaging region.

[0185] The X-ray imaging area can be directly specified by the user when performing X-ray imaging, but it can also be automatically specified by presetting each of multiple imaging protocols and then selecting one of the imaging protocols when performing X-ray imaging subsequently. This will be described in detail below with reference to the accompanying drawings.

[0186] Figures 17 to 19 This is a view showing an example of a pre-defined imaging area according to an imaging protocol. Figure 20 It is a view that shows the information stored in the storage unit.

[0187] like Figure 17 As shown, this can be applied to each preset imaging region in multiple imaging protocols. The descriptions related to the imaging protocols are the same as those described above.

[0188] For each preset imaging region in multiple imaging protocols, the display unit 150 may display an imaging protocol setting window 154. The imaging protocol setting window 154 may include a protocol list 154c.

[0189] Users can use input unit 160 to select from protocol list 154c the imaging protocol that they wish to set for their imaging area.

[0190] To receive settings for the imaging region, an object model 154b with a shape approximating that of an object (e.g., a target to be imaged) can be displayed on the display unit 150. The user can adjust the position and size of the imaging window 154a displayed on the object model 154b to set the imaging region for the selected imaging protocol. In this embodiment, the object is a human body, and the object model 154b has the shape of a human body. It is sufficient that the object model 154b shows the general outline of the object; it does not necessarily need to show the detailed structure of the object.

[0191] For example, the size and position of the imaging window 154a can be adjusted by placing the cursor C on the edge or vertex of the imaging window 154a and selecting and dragging the imaging window 154a.

[0192] Although the shape of the imaging window 154a in this example can be a quadrilateral, the shape is not limited to this. The imaging window 154a can have shapes other than quadrilateral shapes, including polygonal shapes, circular shapes and elliptical shapes.

[0193] In a specific example of setting the imaging region for each of the multiple imaging protocols, such as Figure 18 The area from the face to above the knees of the object shown can be set as the entire AP, such as... Figure 19 The area from the neck to the waist of the object shown can be set as the chest AP.

[0194] like Figure 20 As shown, the defined imaging area can be mapped to the corresponding imaging protocol and stored in the protocol database (DB), which can be stored in the storage unit 170.

[0195] Additionally, X-ray radiation conditions can be stored along with the imaging area for each of multiple imaging protocols. In this case, preset radiation conditions can be applied to each of the multiple imaging protocols, or the X-ray radiation conditions can be set by the user.

[0196] When performing X-ray imaging and selecting one of multiple imaging protocols, the control unit 140 can search the storage unit 170 for an imaging region that is mapped to the selected imaging protocol and perform X-ray imaging on the found imaging region.

[0197] In addition, when the imaging region is mapped and the X-ray radiation conditions are stored, X-ray imaging can be performed by applying the stored X-ray radiation conditions.

[0198] Figure 21 This is a view showing the process of extracting the imaging region corresponding to the imaging protocol from an image of an object. Figure 22 This is a view showing the camera image of the extracted imaging area.

[0199] The user can select the imaging protocol before performing X-ray imaging, and the capture unit 120 can capture camera images 152 while the object is positioned in front of the X-ray detector 200.

[0200] The control unit 140 can search the storage unit 170 for the imaging region mapped to the selected imaging protocol and extract the imaging region from the camera image 152.

[0201] Control unit 140 can extract imaging regions from camera image 152 by applying image processing, such as object recognition algorithms, to camera image 152. For example, edge detection can be applied to camera image 152 to extract the contour or shape of an object and detect some features needed to identify the imaging region (such as the length (height) from head to toes, the width of the head or shoulders, and the length of the legs). In this example, when identifying approximate height, width, etc., the required features can be detected based on approximate height, width, etc., even if not all detailed features of the object are identified.

[0202] In another example, the form of an object can be extracted by analyzing the differences between camera images with and without the object, and various image processing techniques such as object pattern detection and face recognition can be applied to improve the efficiency and accuracy of extracting the imaging region.

[0203] When the imaging region is extracted from the camera image 152 via the control unit 140, the control unit 140 can control the collimator 113 so that the X-ray radiation region E corresponds to the imaging region. That is, the control unit 140 can control the collimator 113 so that the imaging region is irradiated with X-rays. Here, when it is necessary to move the X-ray source 110 or the X-ray detector 200, the X-ray source 110 or the X-ray detector 200 can be moved to a position corresponding to the imaging region. Furthermore, when the area of ​​the imaging region cannot be covered by performing a single X-ray imaging, the imaging region can be divided and stitched imaging can be performed.

[0204] Additionally, the display unit 150 can be accessed via, for example... Figure 22 The extracted imaging region is overlaid on the camera image 152 to display the extracted imaging region, so as to provide the user with information related to the region of the object 1 to be captured.

[0205] Figure 23 This is a view that displays preset information related to the object's size. Figure 24 It is a view that displays pre-stored information related to the size of the object.

[0206] The X-ray radiation conditions for obtaining optimal X-ray images can vary depending on the object size, and the permissible X-ray exposure can also vary depending on the object size. Therefore, the X-ray imaging apparatus 100 according to the embodiment can preset X-ray radiation conditions corresponding to each of a plurality of object sizes, and the user can directly classify the object sizes.

[0207] Reference Figure 23 In the example shown, display unit 150 can display an object size setting screen 155. Specifically, display unit 150 can display an object model 154b and use input unit 160 to categorize object sizes. In a specific example, height, shoulder height, and leg length can be specified and mapped to specific dimensions. Height, shoulder height, and leg length can also be specified as specific values ​​and can also be specified as a predetermined range.

[0208] To specify the height, shoulder height, and leg length, the user can directly input values, drag the edges of the object model 154b displayed on the display unit 150 vertically and horizontally, and also drag the line L corresponding to the head height vertically. H The line L corresponding to shoulder height S And the line L corresponding to the length of the leg. L。 The size of objects categorized by the user can be stored in, for example... Figure 24 The object size DB shown is in the storage unit 170.

[0209] Although the size of the object can be classified as large, medium, small, child, infant, etc., the embodiments of the X-ray imaging device 100 are not limited to this and can be further subdivided or categorized.

[0210] Figure 25 It is a view showing the X-ray radiation conditions that can be set for each of the multiple dimensions of the object.

[0211] Reference Figure 25 A settings window 151, through which X-ray radiation conditions can be set, can be displayed on the screen 150a of the display unit 150. The user can set the X-ray radiation conditions for each of the multiple dimensions of the object.

[0212] A GUI can be displayed on the settings window 151, through which X-ray radiation conditions can be set for each of the multiple sizes of the object. For example, identification labels (large, medium, small, child, and infant) that can identify pre-classified objects can be displayed in the upper part of the settings window 151, and a menu can be enabled when the user manipulates the input unit 160 to select one of the identification labels, through which X-ray radiation conditions can be set for the selected object size.

[0213] When the user moves the cursor C to select the identification label corresponding to the medium size (medium), the result of the interactive operation is that the medium-sized object model 154b can be displayed on the right side of the settings window 151.

[0214] When an object size for which you wish to set X-ray radiation conditions is selected, a GUI that allows you to select X-ray radiation conditions for the selected object size can be enabled.

[0215] When the GUI is enabled, various types of graphical objects can be displayed to set the X-ray radiation conditions for the selected object size. For example, a tube voltage setting button 151a for setting the receiver tube voltage, a tube current setting button 151b for setting the receiver tube current, and an exposure time setting button 151c for setting the X-ray exposure time can be displayed in the settings window 151. The user can select each of these buttons to set the X-ray radiation conditions to the desired value.

[0216] Additionally, the setting window 151 may display a capture position setting button 151d for receiving settings related to whether X-ray imaging will be performed at the support 20 or the stage 10, a collimator setting button 151f for receiving settings related to the size of the collimator 113, an AEC selection button 151g for receiving selections related to the AEC sensor, a sensitivity setting button 151h for receiving settings related to sensitivity, a button 151i for receiving settings related to density, a grating selection button 151j for receiving selections related to the grating, a filter selection button 151k for receiving selections related to the filter, and a focus selection button 151r for receiving selections related to the focus size. The object size selection button 151e can interact with the selection of identification labels. For example, when the user selects an identification label corresponding to medium size (medium), the icon of a medium-sized person included in the object size selection button 151e can be highlighted.

[0217] When setting X-ray radiation conditions for each of the multiple dimensions of the object, the user can select the preset button 151l to complete the settings and can select the reset button 151n when attempting to initialize the settings.

[0218] Figure 25 The GUI shown is merely an example applicable to X-ray imaging device 100. It should be noted that the GUI may have different features than those shown in the image. Figure 25 The different constructions shown are as follows.

[0219] In addition to object size, imaging protocols are also considered when setting X-ray radiation conditions. In this case, X-ray radiation conditions can be set for each of multiple object sizes by dividing the object size into segments according to the imaging protocol. For example, large-size X-ray radiation conditions can be set by dividing the large size into segments: overall PA, overall AP, overall LAT, chest PA, chest AP, chest LAT, leg PA, leg AP, and leg LAT. Similarly, the remaining sizes can also be set.

[0220] In addition, when stitching imaging is required due to the characteristics of the imaging protocol, the stitching area can be divided into multiple regions based on the object model, and X-ray radiation conditions can be set for each of the divided regions.

[0221] The X-ray radiation conditions for each of the multiple dimensions of the object can also be stored in storage unit 170 or, for example, in object size DB together with the object size.

[0222] Figure 26 This is a view showing the operation of automatically determining the size of an object based on camera images.

[0223] When the capture unit 120 captures a camera image, the control unit 140 can analyze the camera image to automatically determine the object size.

[0224] For example, the control unit 140 may apply image processing such as object recognition algorithms to identify the starting point of the leg, toes, shoulders, head, etc. of the object 1 from the camera image 152 and may calculate the leg length, shoulder height, and height in consideration of the recognition results, source-image distance (ID), or source-object distance (OD).

[0225] Alternatively, the control unit 140 may apply edge detection to the camera image to extract the outline of the object, and may also estimate the approximate size of the object by taking into account the object outline size, SID, or SOD shown in the camera image.

[0226] For example, the relationship between the camera coordinate system based on the capture unit 120, the global coordinate system of the space where the X-ray imaging device 100 is arranged, and the two-dimensional coordinate system of the camera image can be stored in advance, and the transformation between the coordinate systems can be used to calculate the outline size of the object displayed in the camera image in the actual space.

[0227] The control unit 140 can search for X-ray radiation conditions corresponding to the estimated object size in the storage unit 170, and can control the X-ray source 110, etc., according to the found X-ray radiation conditions.

[0228] Simultaneously, when the control unit 140 determines the size of the object, the X-ray radiation conditions mapped as the default values ​​for the corresponding size can be displayed on the setting window 151. The mapped X-ray radiation conditions can be applied without modification, or the user can select the button corresponding to each of the X-ray radiation conditions and reset each of the X-ray radiation conditions. Here, the user can refer to the default X-ray radiation conditions displayed in the setting window 151 to reset each of the X-ray radiation conditions.

[0229] As mentioned above, when the X-ray imaging portion of the object is larger than the X-ray radiation region E or the detection region in which the X-ray detector 200 can detect X-rays, the X-ray imaging portion can be divided into multiple regions, and X-ray imaging can be performed separately for each of the multiple divided regions.

[0230] Meanwhile, obtaining a single overall X-ray image by dividing an X-ray imaging portion into multiple regions, imaging each of the multiple divided regions, and stitching together the X-ray images of each of the multiple divided regions can be represented by various terms such as panoramic imaging, stitched imaging, and segmented imaging. For ease of description, in the embodiments described herein, this imaging (panoramic imaging, stitched imaging, segmented imaging, etc.) will be referred to as stitched imaging. Furthermore, each X-ray image within each of the X-ray images in the divided regions will be referred to as a segmented X-ray image, and each X-ray image within each of the X-ray imaging in the divided regions will be referred to as a segmented imaging. Additionally, an image generated by stitching together multiple segmented X-ray images will be referred to as a stitched image. Hereinafter, embodiments related to stitched imaging will be described in detail with reference to the accompanying drawings.

[0231] Figure 27 This is a view showing an example of images stitched together. Figure 28 This is a view showing an example of dividing the imaging region to perform stitched imaging. Figure 29 It is a view showing the overlapping areas between each of the multiple divided regions.

[0232] like Figure 27 As shown, the X-ray imaging device 100 can divide the X-ray imaging portion into multiple regions and can perform X-ray imaging individually on each of the multiple divided regions.

[0233] The control unit 140 can stitch together the segmented X-ray images (i.e., segmented X-ray images X1, X2, and X3) to produce a stitched image X showing the entire X-ray imaging portion. 123 In this embodiment, the entire area in which stitching imaging will be performed will be referred to as the stitching region.

[0234] As described above, when the selected imaging protocol corresponds to stitched imaging, work list 155 can be switched to... Figure 28 The image 152 shown is a camera image. Additionally, the imaging region corresponding to the selected imaging protocol can be automatically designated as the stitching region. The control unit 140 can automatically divide the stitching region. For example, the control unit 140 can divide the stitching region into uniform sizes based on the smaller of the height of the detection region and the maximum height of the X-ray radiation region.

[0235] In a specific example, when the height of the splicing region S (i.e., the top line L representing the starting point of the splicing region) is increased... T And the bottom line L indicating the end point of the splicing area B When the value obtained by dividing the distance between the X-ray detector 200 and the height of the area to be detected by the X-ray detector 200 is an integer, the solution can be transformed into the number of partitioned regions used in the stitched imaging (i.e., the number of X-ray image partitions). On the other hand, when the value is not an integer, the number of partitioned regions is 1 greater than the solution, and the height of each partitioned region is less than the height of the area to be detected by the X-ray detector 200.

[0236] For example, such as Figure 28 As shown, when the stitching region S is divided into three sub-regions S1, S2 and S3, three sub-region X-ray images corresponding to the sub-regions can be captured. These three sub-region X-ray images can then be stitched together to produce a stitched X-ray image.

[0237] The boundary portions between each segmented X-ray image can be matched to stitch the segmented X-ray images together, and X-rays can be radiated such that predetermined regions between the segmented X-ray images overlap each other for matching. When the segmented regions are designated, the control unit 140 can control the collimator 113 to radiate X-rays into the segmented regions such that the X-rays are radiated over a range extending a predetermined size from the segmented region to adjacent segmented regions.

[0238] like Figure 29 In the example shown, X-rays can be emitted such that a first-second overlapping region O is arranged between the first partitioned region S1 and the second partitioned region S2. 12 Furthermore, a second-third overlapping region O is arranged between the second division region S2 and the third division region S3. 23 .

[0239] Due to redundant X-ray irradiation of the overlapping region O 12 and O 23 Therefore, when the radiation-sensitive parts of the genitals or heart are in the overlapping area, the control unit 140 can move the overlapping area to other parts to avoid redundant radiation of X-rays to the radiation-sensitive parts, or it can output a warning to the user.

[0240] It is also possible to determine whether a radiation-sensitive part is in an overlapping area by applying image processing (such as object recognition algorithms) to the camera image 152. For example, the part located in the middle of the length from the head to the toes and as part of the thigh can be identified as the part where the genitals are located, and the part located 20 cm or less below the armpit or shoulder can be identified as the part where the heart is located.

[0241] Information related to radiation-sensitive parts (e.g., information about their location or form) may be pre-stored in storage unit 70 or may be added or modified by the user.

[0242] When a warning is issued, it can be visually output through the display unit 150 or audibly output through a speaker in the X-ray imaging device 100. When a warning is visually issued, the overlapping area can be directly displayed on the display unit 150, such as... Figure 29 As shown, text indicating that the overlapping area is located in a radiation-sensitive region can be displayed on the display unit 150. Since only information needs to be transmitted, the method of outputting the warning is not limited.

[0243] Overlapping regions can be distorted in stitched images, and the quality of overlapping regions in stitched images can be degraded. Therefore, users can determine whether the overlapping portion is an important part of the X-ray image that needs to be protected from image quality degradation based on the information provided related to the overlapping region.

[0244] Figure 30 and Figure 31 This is a view showing the operation of automatically adjusting overlapping areas.

[0245] Referring to the above Figure 29 Assume the following: the first and second overlapping regions O 12 Located in the heart region and the second-third overlapping area O 23 Located in the genital area.

[0246] like Figure 30 As shown, the control unit 140 can move the lower boundary of the first division region S1 downwards, so that the first-second overlapping region O 12 Located below the heart (①) ①'), and the lower boundary of the second division region S2 can be moved downwards, so that the second-third overlapping region O 23 Located below the genitals (②) ②').

[0247] Since the start and end points of the splicing region S remain unchanged, the splicing region S remains unchanged. Therefore, when the size of the first segmented region S1 exceeds the size of the area to be detected by the X-ray detector 200 or the maximum height of the X-ray radiation area due to the movement of the lower boundary of the first segmented region S1, or when the size of the second segmented region S2 exceeds the size of the area to be detected by the X-ray detector 200 or the maximum X-ray radiation area due to the movement of the lower boundary of the second segmented region S2, the first segmented region S1 or the second segmented region S2 can be further subdivided, or the entire splicing region S can be further subdivided into smaller regions, and then the overlapping region can be re-controlled.

[0248] Alternatively, when the overlapping area is visually or audibly output as described above, and the overlapping area is located in a radiation-sensitive region, the user can also adjust the overlapping area. In this case, it can be done as follows: Figure 31 The image shows a radiation-sensitive region 152d on the camera image 152 to guide the user in resetting the overlapping area by avoiding the radiation-sensitive region. For example, the user can move the overlapping area displayed on the display unit 150 or move the boundary lines of multiple dividing regions to reset the overlapping area.

[0249] Figure 32 and Figure 33 This is the view related to cases where the user directly specifies the splicing area.

[0250] In the example above, the pre-mapped imaging area is designated as the stitching region S based on the chosen imaging protocol. However, the stitching region can also be specified directly by the user.

[0251] like Figure 32 and Figure 33 As shown, the camera image 152 captured by the capture unit 120 can be displayed on the display unit 150. On the display unit 150, the top line L indicating the starting point of the stitching area is... T And the bottom line L indicating the end point of the splicing area B It can be displayed by overlaying it onto camera image 152. By viewing camera image 152, the user can intuitively identify the number of segmentation imaging operations necessary to acquire the stitched area of ​​the imaging region. In this respect, display unit 150 is configured to allow the user to intuitively and conveniently identify the optimal number of segmentation imaging operations, thereby preventing excessive X-ray radiation. Top line L T and bottom line L B It can be initially displayed at any position on the camera image 152, or, when an imaging protocol is selected, at a position corresponding to the selected imaging protocol.

[0252] When the top line L T and bottom line L BWhen displayed anywhere on the camera image 152, the bottom line L B It can be located at the lower part of the camera image 152. Since the object's feet are always located at the lower part of the camera image 152 regardless of the object's size, when the bottom line L... B When positioned at the lower end of the camera image 152, the user does not need to manipulate the input unit to move the bottom line L. B Therefore, the user's workload can be reduced.

[0253] When the top line L T and bottom line L B When displayed at a location corresponding to the imaging protocol, the control unit 140 can perform image processing (such as applying an object recognition algorithm to the camera image 152) and identify a portion corresponding to the imaging protocol.

[0254] Alternatively, only the top line L can be displayed. T and bottom line L B One of them can be determined by specifying the number of divisions in the image, and the other can be determined by specifying the number of divisions in the image.

[0255] The user can manipulate the input unit 160 to adjust the top line L. T and bottom line L B The position of the cursor. To guide the user's operation, the display unit 150 may display a cursor C, which can move on the screen displayed on the display unit 150 according to the user's operation on the input unit 160.

[0256] When the input unit 160 is a mouse, trackball, or keyboard, the user inputs existing moving top line L by manipulating the mouse, trackball, or keyboard. T and bottom line L B When a control command is given, the cursor C moves according to the direction and amount of movement corresponding to the operation. When the input unit 160 is a touchpad, the cursor C moves according to the direction and amount of movement of the user's finger.

[0257] For example, users can drag the top line L T Or bottom line L B To make the top line L T Or bottom line L B Move to the desired position, such as Figure 32 and Figure 33 As shown. Top line L T and bottom line L B It can be moved vertically or longitudinally. As mentioned above, it can be moved via the top line L. T and bottom line L B Define the splicing area S. That is, the top line L... T and bottom line L BThe area between them can be the splicing area S.

[0258] Alternatively, when the top line L T and bottom line L B When moving to the position corresponding to the selected imaging protocol, the user can also refer to the top line L after the movement. T and bottom line L B The location is used to redefine the splicing area.

[0259] When a splicing region S is specified, the control unit 140 can automatically divide the splicing region S. The description related to the automatic division of the splicing region S is the same as in the example above.

[0260] Control unit 140 can be activated whenever top line L T and bottom line L B Perform real-time uniform partitioning during movement and display the results. For example, when... Figure 32 When the splicing area S shown is divided into four areas S1, S2, S3 and S4, guide lines such as dashed lines can be used to divide the areas. The guide lines for dividing the areas can be numbered 1 to 4 to provide information about the total number of areas and the number of areas assigned to each corresponding area.

[0261] The first guideline ① can be the lower limit of the maximum area of ​​the X-ray image obtained by performing a single X-ray imaging. The second guideline ② can be the lower limit of the maximum area of ​​the X-ray image obtained by performing two X-ray imaging. The third guideline ③ can be the lower limit of the maximum area of ​​the X-ray image obtained by performing three X-ray imaging. The fourth guideline ④ can be the lower limit of the maximum area of ​​the X-ray image obtained by performing four X-ray imaging.

[0262] In addition, when Figure 33 The user shown has already added the bottom line L B Towards the top line L T During dragging, the control unit 140 can re-execute real-time uniform division. When the splicing area S decreases and is divided into three areas S1, S2, and S3, the guide lines for the division areas can be numbered 1 to 3 to indicate that the splicing area is divided into a total of three areas.

[0263] Additionally, to emphasize that the number of image segments has changed, the display unit 150 may display a fourth guide line ④ to distinguish it from the remaining first guide line ①, second guide line ②, and third guide line ③. The fourth guide line ④ may be displayed as a dashed line, blurred, or displayed in a different color. However, the exemplary embodiment is not limited to this; the fourth guide line ④ may be displayed in different ways to distinguish it from the remaining first guide line ①, second guide line ②, and third guide line ③.

[0264] When the stitching area is specified, the user can select the application button 152a. When the application button 152a is selected, the display unit 150 can display the division windows W1, W2, and W3 on the camera image 152 below.

[0265] Additionally, when displaying the divider window, enter the value L for moving the top line. T Or bottom line L B When using control commands, the current screen, including the divided window, can be switched to the previous screen, including the guide lines, so that the splicing area or the divided area can be reassigned.

[0266] Additionally, when the user directly specifies the stitching region S as described above, it can be determined whether the overlapping region is located in a radiation-sensitive area. If a radiation-sensitive region is detected, a warning can be output or the overlapping region can be automatically controlled. Alternatively, the user can directly define the stitching region S. In this case, as described above, it can be determined whether the overlapping region is located in a radiation-sensitive area. If a radiation-sensitive region is detected, a warning can be output or the overlapping region can be automatically controlled. Furthermore, when the user inputs the division of the stitching region S, the radiation-sensitive region can be displayed on the camera image 152 to guide the user so that the overlapping region is not located in the corresponding radiation-sensitive region.

[0267] Although the control unit 140 has been described in the above embodiments as dividing the stitching region S into uniformly sized sections, embodiments of the X-ray imaging device 100 are not limited thereto. The size of each section can be adjusted to be different from the others, and the size of each section can also be directly set by the user. The user can specify the start and end points of each section. If it is desired to divide the entire stitching region S into three sections, the start and end points of the first section S1, the second section S2, and the third section S3 can be specified.

[0268] Specifying the stitching area by directly moving a large X-ray source makes it difficult for users to accurately specify the stitching area and causes serious user fatigue.

[0269] According to the above embodiments, the X-ray imaging equipment can accurately specify the stitching area and reduce user fatigue.

[0270] In addition, the overlapping area can be adjusted automatically or manually to prevent repeated X-ray irradiation of vital body parts.

[0271] Figures 34A to 36 This is a view showing a screen that allows a user to set the width of the X-ray radiation area of ​​each of a plurality of divided regions in an X-ray imaging apparatus according to an embodiment.

[0272] Traditionally, the width of the division zone is fixed based on the X-ray radiation area determined by the collimator. However, since the area occupied by each object in the division zone is different even relative to a single object, applying an X-ray radiation zone of the same width to all division zones can result in unnecessary exposure to excessive X-rays.

[0273] Therefore, the X-ray imaging apparatus 100 according to the embodiment can adjust the width of the X-ray radiation region for each of the plurality of divided regions. Since the X-ray radiation region is determined by the collimation region, adjusting the X-ray radiation region means adjusting the collimation region.

[0274] like Figure 34A As shown, segmentation windows W1, W2, and W3, corresponding to multiple segmented regions, can be displayed on camera image 152. The first segmentation window W1 corresponds to the first segmented region, the second segmentation window W2 corresponds to the second segmented region, and the third segmentation window W3 corresponds to the third segmented region.

[0275] Available options, such as Figure 34B As shown, the display unit 150 can display partitioned windows W1, W2, and W3, with adjacent windows in W1, W2, and W3 partially overlapping each other above the camera image 152. The first partitioned window W1 and the second partitioned window W2 can overlap each other to represent the overlapping area O between the first partitioned region S1 and the second partitioned region S2. 12 Furthermore, the second partitioning window W2 and the third partitioning window W3 can overlap each other to represent the overlapping area O between the second partitioning region S2 and the third partitioning region S3. 23 .

[0276] Since the dimensions of the dividing windows correspond to the dimensions of the dividing regions, the width of the dividing regions corresponds to the width of the X-ray radiation region E adjusted by the collimator 113. The height of the dividing regions can be determined according to the division performed by the control unit 140 or the user, and the collimator 113 can be automatically adjusted according to the determined height of the dividing regions.

[0277] In this embodiment, the width and height of the divided regions are adjustable. Users can input control commands to adjust the width of the divided regions by horizontally dragging the left and right boundaries of the divided windows W1, W2, and W3.

[0278] For example, such as Figure 35 As shown, the left boundary of the second dividing window W2 can be dragged to the left and its right boundary can be dragged to the right to extend the width of the X-ray radiation area, so that the entire body is included in the X-ray radiation area corresponding to the dividing area of ​​the body part of the object.

[0279] Available options, such as Figure 36 As shown, the left boundary of the third partition window W3 can be dragged to the right and its right boundary can be dragged to the left to reduce the width of the X-ray radiation area, so that the background without legs is removed from the X-ray radiation area corresponding to the partition area of ​​the object's legs.

[0280] When the width of the X-ray radiation area for each of the multiple partitioned regions has been set, the user can select the Apply button 152a, and the storage unit 170 can store information about the set X-ray radiation area width when the Apply button 152a is selected.

[0281] A GUI can be displayed on the settings window 151, through which X-ray radiation conditions can be set for each of the multiple partitioned regions. For example, identification labels 151p that can be used to identify partitioned regions can be displayed at the top of the settings window 151, and identification labels #1, #2, and #3 corresponding to partitioned regions can be displayed on identification labels 151p-1, 151p-2, and 151p-3, respectively. When the user manipulates the input unit 160 and selects one of the identification labels, the GUI for setting X-ray radiation conditions for the selected partitioned region can be enabled.

[0282] The descriptions associated with the various types of buttons displayed in the enabled GUI are the same as in the examples above, and therefore will be omitted.

[0283] The size of the collimator for each of the multiple division regions, i.e., the size of the X-ray radiation region, can also be adjusted using the collimator setting button 151f displayed on the settings window 151. Here, when the size of the collimator is adjusted by selecting the collimator setting button 151f, the camera image 152 displayed on the right can be interacted with, and the width of the division windows W1, W2, and W3 can be adjusted in conjunction with it.

[0284] Conversely, when the width of the X-ray radiation region is adjusted by horizontally dragging the boundaries of the dividing windows W1, W2, and W3 as described above, the collimator setting button 151f can be interacted with and changed. For example, when the size of the collimator relative to the first dividing region S1 is reduced to 14×17 by dragging the boundary of the dividing window W1, the collimator setting button 151f displayed on the setting window 151 can also display a size of 14×17.

[0285] Simultaneously, the width of the X-ray radiation area can be automatically controlled by the control unit 140. In this case, the control unit 140 can apply image processing (such as edge detection) to the camera image to extract the contour of the object, and can control the width of the X-ray radiation area based on the boundary between the object contour and the background.

[0286] For example, the control unit 140 can prevent unnecessary excessive X-ray exposure by reducing the width of the X-ray radiation area when the boundary between the object outline and the background is within the currently shown X-ray radiation area, and can acquire the required information by expanding the width of the X-ray radiation area when the boundary between the object outline and the background is outside the currently shown X-ray radiation area.

[0287] Once the size of the X-ray radiation area and the X-ray radiation conditions for all the multiple divided regions are set, the user can select the exposure button 151l to perform X-ray imaging and can select the reset button 151n while attempting to initialize the settings.

[0288] Figure 37 and Figure 38 This is a view showing a screen that allows a user to select an AEC sensor in an X-ray imaging apparatus according to an embodiment.

[0289] As described above, the X-ray dose can be automatically controlled using multiple AEC sensors 26a, 26b, and 26c. Depending on the X-ray imaging section, all or some of the multiple AEC sensors 26a, 26b, and 26c can be used. Therefore, AEC sensor selection can also be performed for each of the multiple segmented regions.

[0290] like Figure 37 As shown, multiple graphic objects corresponding to multiple AEC sensors 26a, 26b, and 26c can be displayed within partitioned windows W1, W2, and W3, respectively. The control unit 140 performs geometric registration of the camera image 152 by matching points in the camera image 152 with their positions in actual space. For example, the control unit 140 can use the relationship between the camera coordinate system, the global coordinate system, and the image coordinate system.

[0291] The control unit 140 can acquire the positions of AEC sensors 26a, 26b, and 26c corresponding to the positions of the X-ray detector 200 and coordinate the AEC sensors 26a, 26b, and 26c with the camera image 152. The control unit 140 can perform image processing, thereby coordinating the AEC sensors 26a, 26b, and 26c with the camera image 152 and overlaying graphic objects corresponding to the AEC sensors onto the camera image 152.

[0292] For example, a graphical object may include multiple AEC sensor buttons 153a-1, 153b-1, and 153c-1 corresponding to multiple AEC sensors 26a, 26b, and 26c, respectively; multiple AEC sensor buttons 153a-2, 153b-2, and 153c-2; and multiple AEC sensor buttons 153a-3, 153b-3, and 153c-3. Each of the AEC sensor buttons may be displayed at the location corresponding to its AEC sensor.

[0293] Users can select the AEC sensor to be used in each of the multiple partitioned areas. When the button corresponding to the AEC sensor to be used among the multiple AEC sensor buttons 153a-1, 153b-1 and 153c-1 in the first partition window W1 is selected, the AEC selection button 151g interacts with it, and the selection is also reflected and displayed on the AEC selection button 151g in the settings window 151.

[0294] Conversely, when Figure 38 When the AEC selection button 151g on the settings window 151 is used to input the selection of the AEC sensor, multiple AEC sensor buttons 153a-1, 153b-1 and 153c-1 interact with it, and the selection is also reflected and displayed on multiple AEC sensor buttons 153a-2, 153b-2 and 153c-2.

[0295] When selecting an AEC sensor, the button can be highlighted by changing its color, darkening or brightening its edges, or making it flash, thus indicating that the selected AEC sensor has been chosen. Alternatively, selected and unselected AEC sensors can be distinguished using solid and dashed lines. Optionally, the text "On / Off" can be displayed on the AEC sensor button, changing from "On" to "Off" when an "On" button is selected, and vice versa.

[0296] Additionally, selecting the checkbox above the AEC selection button 151g will turn these multiple AEC sensors on or off.

[0297] When performing X-ray imaging, the selected AEC sensor can be turned on, and the unselected AEC sensor can be turned off. However, it is possible to reverse this process.

[0298] When the AEC sensor button displayed on camera image 152 and the AEC rotary button 151g displayed on settings window 151 interact with each other as described above, the user can more intuitively identify the position of the AEC sensor he or she has selected.

[0299] Furthermore, since the X-ray detector 200 is obstructed by the object 1 during X-ray imaging, the user cannot directly identify the position of the AEC sensor. According to the exemplary embodiment described above, the display unit 150 can display the AEC sensor button above the camera image 152, thereby enabling the user to intuitively and conveniently identify the relationship between the actual object and the position of the AEC sensor.

[0300] Furthermore, when the width of the X-ray radiation region is adjusted as described above, the AEC sensor can be selected taking into account the adjusted width of the X-ray radiation region. For example, when the width of the X-ray radiation region is narrowed, only some of the AEC sensors can be selected.

[0301] Alternatively, the control unit 140 may automatically select an AEC sensor based on the size of each of the multiple partitioned regions or the size of the X-ray radiation area of ​​each partitioned region. For example, the control unit 140 may avoid selecting AEC sensors located outside the X-ray radiation area or that are unnecessary. Even if the control unit 140 selects an AEC sensor, it may display which AEC sensor has been selected on the AEC selection button 151g displayed on the setting window 151 and the AEC sensor button in the camera image 152. For example, the control unit 140 may use image processing (such as contour detection or edge detection) to detect the contour or edge of object 1 in the camera image 152 and disable AEC sensors outside object 1.

[0302] If the AEC sensor outside object 1 is not turned off, it can directly receive X-rays that have not penetrated object 1. This causes the amount of X-rays received by the AEC sensor to rapidly exceed the predetermined amount. In this case, the quality of the X-ray image may be degraded due to insufficient X-ray dose radiated onto object 1.

[0303] Therefore, the control unit 140 can prevent the quality of the X-ray image from being degraded by turning off the AEC sensor located outside the object 1.

[0304] Once the X-ray radiation area and conditions for each of the multiple segmented regions are set and the exposure button 151l is selected, the X-ray imaging device 100 can automatically control the positions of the X-ray source 110 and the X-ray detector 200 to perform mosaic imaging. In the following text, reference will be made to... Figures 39A to 39C This will be described.

[0305] Figures 39A to 39C This is a view relating to the case where stitched imaging is performed by controlling the tilt angle of the X-ray source in the X-ray imaging apparatus according to an embodiment. In this embodiment, the case where capture is performed by mounting the X-ray detector 200 on the support 20 is given as an example.

[0306] Before operating the X-ray imaging device 100, calibration can be performed to calculate the positional relationship between the camera image and the X-ray image obtained through the capture unit 120.

[0307] For example, when the splicing region S is divided into three regions S1, S2 and S3, the control unit 140 calculates, based on the previous calibration result, the first position or first tilt angle corresponding to the first divided region S1 irradiated with X-rays, the second position or second tilt angle corresponding to the second divided region S2 irradiated with X-rays, and the third position or third tilt angle corresponding to the third divided region S3 irradiated with X-rays.

[0308] Before performing stitched imaging, it can be assumed that the X-ray source 100 has been moved to the position corresponding to the X-ray detector 200. For example, when both the support 20 and the stage 10 are present in the examination room and the user has selected the support 20, the control unit 140 can move the X-ray source 110 to the position corresponding to the support 20. The position of the X-ray source 110 corresponding to the support 20 can be pre-stored.

[0309] Alternatively, the user can manually move the X-ray source 100 to the position corresponding to the support 20.

[0310] The tilt angle of the X-ray source 110 can be adjusted to, for example... Figure 39A The angle corresponding to the first segmented region S1 shown is used to capture the first segmented X-ray image. The tilt angle of the X-ray source 110 can be adjusted as follows: Figure 39B The angle shown corresponds to the second segmented region S2 to capture the second segmented X-ray image, and the tilt angle of the X-ray source 110 can be adjusted as follows: Figure 39C The angle shown corresponds to the third division region S3 to capture the third division X-ray image. Here, the height of the X-ray source 110 above the ground can be fixed.

[0311] The control unit 140 can send control signals to a motor that adjusts the tilt angle of the X-ray source 110 to adjust the tilt angle of the X-ray source 110 to an angle corresponding to each of the divided regions.

[0312] Additionally, the control unit 140 can control the collimator 113 to correspond to the size of the X-ray radiation area of ​​the first, second, and third division regions. For example, when the splicing region is divided into uniform sizes and the height of the division regions is the same, the positions of the second blade 113b and the fourth blade 113d can be fixed, and when the width of the division region or the width of the X-ray radiation area is set to be different, the positions of the first blade 113a and the third blade 113c can also be controlled.

[0313] When the width of the X-ray radiation region extends beyond the default value, the first blade 113a can move in the +x-axis direction, and the third blade 113c can move in the -x-axis direction.

[0314] In addition, when the X-ray radiation conditions of the first, second, and third division regions are set to be different, the X-ray source 110 or the X-ray detector 200 can be controlled to correspond to the radiation conditions set when capturing each division region.

[0315] In another example, the height of the X-ray source 110 can also be adjusted to correspond to the height of the first division region S1 to capture a first division X-ray image, to correspond to the height of the second division region S2 to capture a second division X-ray image, and to correspond to the height of the third division region S3 to capture a third division X-ray image. Here, the tilt angle of the X-ray source 110 can be fixed.

[0316] In yet another example, the height and tilt angle of the X-ray source 110 can also be adjusted simultaneously.

[0317] In both examples, the X-ray detector 200 is moved to a position corresponding to each divided region. To move the X-ray detector 200, the control unit 140 can move the mounting unit 24 on which the X-ray detector 200 is mounted to a position corresponding to each divided region.

[0318] When each segmented region is specified, the control unit 140 can calculate the actual position of the X-ray detector 200 to match the center of the specified segmented region with the center of the X-ray detector 200. Additionally, as per [reference to...] Figures 11 to 15 The described configuration includes an alignment X-ray source 110 and an X-ray detector 200.

[0319] Furthermore, in the case of stitched imaging, since multiple X-ray images are captured separately and stitched together into a single image, the image quality of the X-ray images deteriorates as the object moves between each of the time points in which the stitching is performed. Therefore, when performing stitched imaging, the orientation of the object must be controlled between each of the time points in which the stitching is performed. This will be described in detail below.

[0320] Figure 40 This is a view showing the operation of using camera images to determine the movement of an object. Figure 41 and Figure 42 This is a view showing the control performed when re-imaging is performed after stitching imaging has stopped, while partially completing the segmentation imaging.

[0321] Even while performing segmentation imaging, the capture unit 120 can capture camera images, and the captured camera images can be sent to the control unit 140 in real time. In addition, the captured camera images can be displayed on the display unit 150 in real time.

[0322] Additionally, the captured camera images can be stored in the storage unit 170. In this case, the stored camera images can be stored indefinitely until the user inputs a deletion command, and the oldest images can be automatically deleted when a preset amount of time has elapsed or a preset storage capacity has been exceeded.

[0323] like Figure 40 As shown, the control unit 140 can compare the camera image 152' corresponding to the time point at which the previous segmented X-ray image was captured with the current camera image 152 to detect movement of the object shown in the two images. In this example, the previous segmented X-ray image is the second segmented X-ray image, and the current image to be captured is the third segmented X-ray image.

[0324] For example, object movement can be detected by analyzing the distance d between the two images. Movement can also be detected by comparing the orientation of the object shown in the camera image when the second segmentation imaging is performed with the orientation of the object shown in the current camera image.

[0325] When the detected movement has a value equal to or greater than a preset reference value, it can be determined that the first and second segmented X-ray images cannot be matched, even when capturing the third segmented X-ray image. Therefore, the control unit 140 can visually or audibly warn of the mismatch or automatically stop the stitching imaging.

[0326] When the movement of the object, as described above, has a value equal to or greater than the reference value, or when the object's condition is unstable or at a critical point, imaging can be stopped while the partial division imaging is completed.

[0327] For example, such as Figure 41As shown, after capturing the first segmented X-ray image X1 and the second segmented X-ray image X2, imaging can be stopped before performing X-ray imaging on the third segmented region S3. Although this example shows the first segmented X-ray image X1 and the second segmented X-ray image X2 pre-stitched together to produce an image X of the first and second segmented regions stitched together. 12 However, after obtaining the third segmented X-ray image, the first segmented X-ray image X1, the second segmented X-ray image X2, and the third segmented region S3 can be stitched together at once.

[0328] The first segmented X-ray image X1 and the second segmented X-ray image X2, along with camera images captured during the first or second segmented imaging process, can be stored together in storage unit 170. Information about the segmented regions of the stitched imaging can also be stored in the camera images. Identification tags can be stored together so that when stitched imaging is subsequently restarted, the stored segmented X-ray images or camera images can be loaded, and the identification tags may include information capable of classifying the learned data. The information capable of classifying the learned data may be one of the following: object name, date / capture time, imaging protocol and its combination, or user-set information unrelated to the above.

[0329] When resuming the same stitching imaging after a pause, the control unit 140 can search for and load camera images stored in the storage unit 170. For this purpose, the user can input an identification tag corresponding to the stitching imaging that will now resume.

[0330] like Figure 42 As shown, the current camera image can be displayed on the display unit 150, and the camera image loaded from the storage unit 170 (i.e., the camera image captured at the time point of the previous segmentation imaging) can be displayed by overlaying it on the current camera image.

[0331] According to this example, the camera image 152' captured during the second segmentation imaging can be displayed by overlaying it onto the current camera image, allowing the user to refer to the overlaid camera image to guide the orientation of the object. Because the two images overlap, the user can accurately identify the differences in the orientation of the object shown in the two images and guide the current orientation of the object to match the object orientation during the second segmentation imaging.

[0332] When the object's orientation is matched to that of the object during the previous imaging segmentation, as instructed by the user—that is, when the object's current orientation matches that of the object during the second imaging segmentation—a third imaging segmentation can be performed. Here, the user can visually determine whether the object's orientation matches, or the control unit 140 can determine whether the object's orientation matches based on the aforementioned movement detection criteria. For example, if the object's outline in the previous camera image 152' matches the object's outline in the current camera image 152, the orientation can be determined to be matched. Furthermore, the fact that the orientation during the previous imaging segmentation matches the current orientation can be visually or audibly output, allowing the user to select the exposure button, or the control unit 140 can automatically perform the orientation segmentation.

[0333] When performing third-division imaging, a third-division X-ray image X3 can be acquired. The control unit 140 can load the first-division X-ray image X1 and the second-division X-ray image X2, or a stitched image X3 formed by combining these two X-ray images, stored in the storage unit 170. 12 To perform stitching with the third segmented X-ray image X3, an image X is produced by stitching the entire stitched region S together. 123 .

[0334] Alternatively, even in cases other than stopping and restarting stitching imaging, the orientation of an object can be guided by overlaying a camera image acquired during the previous segmentation imaging onto the current camera image.

[0335] For example, when subsequent segmentation imaging cannot be performed due to the large amount of patient movement as described above, the orientation of the subject can be guided by overlaying the camera image 152' acquired during the previous segmentation imaging onto the current camera image 152.

[0336] The following describes a method for controlling an X-ray imaging apparatus according to an embodiment.

[0337] The X-ray imaging device 100 described above can be used in a method for controlling an X-ray imaging device according to an embodiment. Therefore, the description given above can also be equally applied to methods for controlling X-ray imaging devices.

[0338] Figure 43 This is a flowchart illustrating an example of a method for verifying an X-ray radiation region in a method for controlling an X-ray imaging apparatus according to an embodiment.

[0339] Reference Figure 43The control unit 140 uses the coordinate information of the X-ray imaging device 100 to generate an X-ray radiation window (410) to be displayed on the display unit 150. The control unit 140 can use the pre-stored coordinate information of the X-ray imaging device 100 to obtain information about the position and size of the X-ray radiation window.

[0340] The control unit 140 may include pre-stored information such as the distance between the X-ray source 110 and the X-ray detector 200, the shape and area of ​​the slit R to be irradiated by X-rays formed by the collimator 113, and the distance from the X-ray tube 111 to the slit R, or may use the pre-stored information to calculate the above information.

[0341] The control unit 140 can use the above information to calculate the three-dimensional coordinates of the X-ray radiation region E formed at the X-ray detector 200. The three-dimensional coordinates of the X-ray radiation region E calculated by the control unit 140 correspond to the coordinates on the global coordinate system of the space where the X-ray imaging device 100 is located.

[0342] Since the X-ray radiation window B1 is displayed overlaid on the camera image acquired by the capture unit 120 and the X-ray radiation window B1 displayed overlaid on the camera image is based on a two-dimensional coordinate system, the control unit 140 must convert information about the three-dimensional coordinates of the calculated X-ray radiation region E into coordinates based on the two-dimensional image coordinate system.

[0343] Furthermore, since the capture unit 120 and the global coordinate system have different coordinates, the global coordinate system must be transformed into the camera coordinate system. This involves converting the information about the three-dimensional coordinates of the X-ray radiation region E into coordinates based on the two-dimensional image coordinate system. In other words, the global coordinate system must be transformed into the camera coordinate system, and the information about the three-dimensional coordinates that have been transformed into coordinates based on the camera coordinate system must be transformed into coordinates based on the two-dimensional image coordinate system.

[0344] The control unit 140 can use the two-dimensional coordinates obtained above to display the X-ray radiation window B1 by overlaying it onto the camera image on the display unit 150.

[0345] In addition, the control unit 140 performs image processing on the image of the light radiation region L of the collimator 113 acquired by the capture unit 120 to generate the X-ray radiation window B2 (411) displayed on the display unit 150.

[0346] As described above, the X-ray radiation window B1 can be displayed on the display unit 150 using coordinate information, or the boundary of the light radiation region L shown in the camera image acquired by the capture unit 120 can be extracted through image processing to display the X-ray radiation window B2.

[0347] When the X-ray radiation window B1 generated using coordinate information and the X-ray radiation window B2 generated by image processing do not match ("No" in 412), the control unit 140 performs calibration (413).

[0348] According to the disclosed embodiment, the X-ray imaging apparatus 100 undergoes a calibration process that matches the light radiation area with the actual X-ray radiation area by adjusting the lamps and reflectors of the collimator and determining the camera parameters of the capture unit 120 (such as principal point, focal length, mounting angle, etc.) so that the X-ray radiation window displayed on the display unit 150 can accurately represent the actual X-ray radiation area E.

[0349] When no errors occur during the calibration process, the X-ray radiation window generated using coordinate information and the X-ray radiation window generated through image processing match each other. Therefore, when the X-ray radiation windows do not match each other, it can be determined that an error has occurred in the aforementioned calibration process.

[0350] Therefore, the control unit 140 performs the following process: by performing a process of comparing the X-ray radiation window B1 generated using coordinate information with the X-ray radiation window B2 generated by image processing to determine whether the two match, it verifies whether an error occurred in the above calibration process.

[0351] Since the inconsistency between the X-ray radiation windows generated by the two methods described above indicates an error in the calibration process, the control unit 140 can display a message requesting calibration via the display unit 150. The user can view this message and re-perform the calibration process described above.

[0352] Furthermore, when the X-ray radiation windows generated using the two methods described above do not match, the control unit 140 can calculate the degree of inconsistency to determine the calibration parameters needed to resolve the inconsistency, instead of displaying a message requesting calibration. The control unit 140 can calculate the focal length and principal point of the capture unit 120 required to resolve the inconsistency based on the inconsistency information, and can also calculate the variables required to transform the global coordinate system into the camera coordinate system. Additionally, in the disclosed embodiments, a deviation occurs due to the difference between the focal point of the capture unit 120 and the focal point of the X-ray tube 111. The control unit 140 can use the inconsistency information to calculate the parameters required to compensate for this deviation. The control unit 140 can use the parameters calculated above to automatically perform calibration or display the calculated parameters via the display unit 150 to assist the user in performing calibration.

[0353] Figure 44 This is a flowchart illustrating an example of a method for aligning an X-ray source and an X-ray detector with each other in a method for controlling an X-ray imaging apparatus according to an embodiment.

[0354] like Figure 44 As shown, the control unit 140 displays the boundary of the X-ray detector 200 and the X-ray radiation area (421) on the display unit 150.

[0355] The control unit 140 generates the X-ray radiation window B3 by using the coordinate information method described above or by extracting the boundary of the X-ray radiation region through image processing to display the X-ray radiation region, and displays the generated X-ray radiation window B3 by overlaying it onto the camera image 152.

[0356] Additionally, the control unit 140 can generate a detector boundary line B4 representing the boundary of the X-ray detector 200 by using coordinate information as described above or by extracting the boundary of the X-ray detector 200 through image processing. The generated detector boundary line B4 can be displayed by overlaying the generated detector boundary line B4 onto the camera image 152 captured by the capture unit 120.

[0357] The X-ray radiation window B3 and the detector boundary line B4, which are displayed by overlaying on the camera image 152, can be distinguished from each other by using different colors or by using dashed and solid lines.

[0358] Control unit 140 determines whether the center of detector boundary line B4 and the center of X-ray radiation window B3 match (422), and when they do not match ("no" in 422), calculates the moving distance of X-ray source 110 and X-ray detector 200 based on the degree of inconsistency between the center of detector boundary line B4 and the center of X-ray radiation window B3 (423). Additionally, the moving distance can be calculated together, and control unit 140 moves and aligns X-ray source 110 and X-ray detector 200 according to the calculated moving distance and moving direction (424).

[0359] When the intervals between the four vertices forming the X-ray radiation window B3 and the four vertices forming the detector boundary line B4 are perfectly matched, the control unit 140 can determine that the X-ray detector 200 and the X-ray source 110 are aligned with each other.

[0360] Alternatively, when the center of the detector boundary line B4 matches the center of the X-ray radiation window B3 ("Yes" in 422), the control unit 140 can determine that the X-ray detector 200 and the X-ray source 110 are aligned with each other.

[0361] When the intervals between the four vertices forming the X-ray radiation window B3 and the four vertices forming the detector boundary line B4 are not the same, or when the center of the X-ray radiation window B3 and the center of the detector boundary line B4 do not match, the control unit 140 can determine that the X-ray detector 200 and the X-ray source 110 are misaligned. In this case, the control unit 140 can calculate the intervals g2, g3, g4, and g5 between the four vertices of the X-ray radiation window B3 and the four vertices of the detector boundary line corresponding to these four vertices, and calculate the moving distance and direction of the X-ray source 110 or X-ray detector 200 that make the calculated intervals match each other. The control unit 140 can match the intervals by moving the X-ray source 110 or X-ray detector 200 based on the moving distance and direction of the X-ray source 110 or X-ray detector 200 calculated above. Alternatively, the control unit 140 can also display the calculated moving distance and direction of the X-ray source 110 or X-ray detector 200 through the display unit 150 to guide the user in moving the X-ray source 110 or X-ray detector 200.

[0362] Alternatively, the control unit 140 can calculate the interval g1 between the center of the X-ray radiation window B3 and the center of the detector boundary line B4, and based on the calculated interval, calculate the moving direction and moving distance of the X-ray source 110 or X-ray detector 200 to match the center of the X-ray radiation window B3 and the center of the detector boundary line B4. The control unit 140 can match the center of the X-ray radiation window B3 and the center of the detector boundary line B4 by moving the X-ray source 110 or X-ray detector 200 based on the moving direction and moving distance of the X-ray source 110 or X-ray detector 200 as calculated above. Accordingly, the control unit 140 can match the center of the actual X-ray radiation area with the center of the X-ray detector 200. Alternatively, the control unit 140 can also display the calculated moving direction and moving distance of the X-ray source 110 or X-ray detector 200 via the display unit 150 to guide the user in moving the X-ray source 110 or X-ray detector 200.

[0363] When the center of the detector boundary line B4 matches the center of the X-ray radiation window B3, the control unit 140 receives an adjustment command (425) to adjust the X-ray radiation area, and when a portion deviating from the detector boundary line B4 appears within the X-ray radiation window B3 displayed on the display unit 150 ("Yes" in 426), the control unit 140 displays this portion deviating from the detector boundary line B4 (427).

[0364] When the X-ray source 110 and the X-ray detector 200 are aligned with each other, the user can input a predetermined operation command through the input unit 160 to adjust the position, size, or form of the X-ray radiation window B3.

[0365] When the user adjusts the X-ray radiation window B3, the X-ray radiation window B3 may deviate from the detector boundary line B4. Unnecessary excessive X-ray exposure can occur when areas deviating from the boundary of the X-ray detector 200 are also irradiated with X-rays. Therefore, when the X-ray radiation window B3 deviates from the detector boundary line B4, the control unit 140 can inform the user by displaying the area B3-2 deviating from the detector boundary line B4 and the area B3-1 existing within the detector boundary line B4 using different colors to prevent excessive X-ray exposure. For example, the control unit 140 can display the area within the detector boundary line B4 in green and the area deviating from the detector boundary line B4 in red to inform the user that the X-ray radiation window has deviated from the boundary of the X-ray detector 200. Alternatively, dashed and solid lines can be used instead of different colors to provide notification about areas deviating from the boundary of the X-ray detector 200.

[0366] Using different colors or dashed and solid lines to indicate that the X-ray radiation window has deviated from the boundary of the X-ray detector 200 is merely an example; sound or vibration from the input unit 160 can also be used. That is, according to the disclosed X-ray imaging device 100, various methods based on visual, auditory, or tactile stimuli can be used to inform the user that the X-ray radiation window displayed on the display unit 150 has deviated from the boundary of the X-ray detector 200.

[0367] Figure 45 This is a flowchart related to the method of setting an imaging protocol in a method for controlling an X-ray imaging apparatus according to an embodiment.

[0368] Reference Figure 45 For each preset imaging region (430) in multiple imaging protocols, the imaging region can be set according to user input. For this purpose, the display unit 150 can display an imaging protocol setting window 154. The imaging protocol setting window 154 may include a protocol list 154c.

[0369] The user can use input unit 160 to select an imaging protocol from protocol list 154c from which the user wishes to set the imaging area. To receive the imaging area settings, an object model 154b with a shape approximating the object shape can be displayed on display unit 150, and the user can adjust the position and size of the imaging window 154a displayed on object model 154b to set the imaging area for the selected imaging protocol. The imaging area for each setting in the imaging protocol is stored in storage unit 170.

[0370] Then, before performing X-ray imaging, camera images (431) are captured using capture unit 120. For each of the imaging protocols, there is a time difference between X-ray imaging and the imaging area.

[0371] Select imaging protocol (432). The imaging protocol can be selected by user input.

[0372] Search for imaging regions that are mapped to the selected imaging protocol (433). The imaging region can be searched via control unit 140. For example, when the selected imaging protocol is chest PA, search for imaging regions that are mapped and stored in chest PA.

[0373] Extract the imaging region from the camera image (434). For example, the control unit 140 can extract the imaging region from the camera image 152 by applying image processing such as an object recognition algorithm. For example, edge detection can be applied to the camera image 152 to extract the outline or shape of the object and detect some features required to identify the imaging region (such as the length (height) from head to toe, the width of the head or shoulders, and the length of the legs).

[0374] The imaging area is irradiated with X-rays to perform X-ray imaging (435). When the imaging area is extracted from the camera image 152 via the control unit 140, the control unit 140 can control the collimator 113 so that the X-ray radiation area E corresponds to the imaging area. When the X-ray source 110 or X-ray detector 200 should be moved, the X-ray source 110 or X-ray detector 200 can be moved to the position corresponding to the imaging area. In addition, when the imaging area has a range that cannot be covered by performing a single X-ray imaging, the imaging area can be divided and stitched imaging can be performed.

[0375] Figure 46 This is a flowchart related to a method for determining whether segmented imaging stops due to object movement in a method for controlling an X-ray imaging apparatus according to an embodiment. In this example, stitched imaging is performed, and the stitched area is divided into a first segmented region, a second segmented region, and a third segmented region.

[0376] Reference Figure 46 The camera image (440) is captured using the capture unit 120. The capture unit 120 can capture video in real time or continuously capture video until the X-ray imaging is complete.

[0377] Perform first segmentation imaging (441). For this purpose, the position or tilt angle of the X-ray source 110 can be controlled to correspond to the position or angle of the first segmentation region, and the position of the X-ray detector 200 can be controlled to correspond to the position of the first segmentation region.

[0378] Detecting movement of the object (442). Specifically, the control unit 140 can compare the orientation of the object shown in the current camera image with the orientation of the object shown in the camera image during the first segmentation imaging to detect movement.

[0379] When the detected movement has a value equal to or greater than a preset reference value ("Yes" in 443), it can be determined that even if segmentation imaging is performed, the first segmentation X-ray image and the second segmentation X-ray image cannot be matched, and imaging can be stopped.

[0380] When the detected movement is not equal to or greater than the preset reference value ("No" in 443), the second segmentation imaging is performed (444).

[0381] Movement of the object is detected (445). The control unit 140 can compare the orientation of the object shown in the current camera image with the orientation of the object shown in the camera image during the second segmentation imaging to detect movement.

[0382] When the detected movement has a value equal to or greater than the preset reference value ("Yes" in 446), it can be determined that the second and third segmented X-ray images cannot be matched even if segmented imaging is performed, and imaging can be stopped.

[0383] When the detected movement is not equal to or greater than the preset reference value ("No" in 446), the third segmentation imaging is performed (447).

[0384] Alternatively, warnings can be displayed to the user to guide the user toward the intended object, rather than stopping the capture.

[0385] When the third segmentation imaging is completed, the first segmentation X-ray image, the second segmentation X-ray image, and the third segmentation X-ray image can be stitched together to produce a stitched image.

[0386] Figure 47 This is a flowchart relating to the case of restarting stitching imaging in a method for controlling an X-ray imaging apparatus according to an embodiment.

[0387] As described above, when the movement of an object has a value equal to or greater than the reference value, or when the condition of the object is unstable or at a critical point, imaging can be stopped while the partial division imaging is completed.

[0388] When stitching imaging stops, the captured segmented X-ray images and the camera images captured during the segmentation imaging process can be stored in storage unit 170. Information about the segmented regions of the stitched imaging can also be stored in the camera images.

[0389] Additionally, when stitching imaging resumes (450), the control unit 140 can search for and load the camera images that were mapped and stored in the storage unit 170 for resuming stitching imaging.

[0390] Display unit 150 can display a previous camera image (451) by allowing the previous camera image to overlap with the current camera image. The user can refer to the overlapping camera image to guide the orientation of the object. Since the two images overlap each other, the user can accurately identify the differences between the orientations of the objects shown in the two images and guide the current orientation of the object to match the object orientation during the second segmentation imaging.

[0391] Figure 48 This is a flowchart related to a method for controlling an overlapping region in a method for controlling an X-ray imaging apparatus according to an embodiment.

[0392] Reference Figure 48 Specify the stitching region (460) where the stitching imaging will be performed. The stitching region can be specified by direct user input or automatically by selecting an imaging protocol. That is, the imaging region corresponding to the selected imaging protocol can be specified as the stitching region.

[0393] Divide the splicing region (461). For example, the splicing region can be divided into uniform sizes, taking into account the size of the splicing region and the size of the area to be detected by the X-ray detector 200.

[0394] Determine whether the overlapping area is within a radiation-sensitive region (462). This can also be determined by applying an object recognition algorithm. For example, a region located at the midpoint of the length from head to toes and forming part of the thigh can be identified as the genital area, while a region separated from the armpit or shoulder by 20 cm or less can be identified as the heart area. Information related to radiation-sensitive regions can be pre-stored in storage unit 70 or can be added or modified by the user.

[0395] When the overlapping area is within a radiation-sensitive region ("Yes" in 462), the overlapping area can be adjusted (463). The overlapping area can be adjusted automatically by the control unit 140 or based on user input. In the former case, the control unit 140 can adjust the boundary of the corresponding division area so that the overlapping area avoids the radiation-sensitive region. In the latter case, the position of the radiation-sensitive region can be displayed on the display unit 150 to guide the user's input.

[0396] Figure 49 This is a flowchart related to a method for controlling a preset object size in an X-ray imaging apparatus according to an embodiment.

[0397] Reference Figure 49The dimensions of the object are set and stored (470). For example, display unit 150 may display an object size setting window 156. Specifically, display unit 150 may display an object model 154b, and the user may use input unit 160 to categorize the object dimensions. In a specific example, height, shoulder height, and leg length may be specified and mapped to specific dimensions. Height, shoulder height, and leg length may also be specified as specific values ​​and may also be specified as a predetermined range. The object dimensions categorized by the user may be stored in an object size DB, and the object size DB may be stored in storage unit 170. Although the dimensions of the object may be categorized as large, medium, small, child, infant, etc., embodiments of the X-ray imaging device 100 are not limited to this, and the dimensions may be further subdivided or categorized.

[0398] X-ray radiation conditions are set and stored for each of the multiple object sizes (471). For example, a settings window 151 through which X-ray radiation conditions can be set can be displayed on the display unit 150. The user can set X-ray radiation conditions for each of the object sizes. The settable X-ray radiation conditions may include tube voltage, tube current, and exposure time, and may also include the location for performing X-ray imaging (the support and stage for performing X-ray imaging), collimator size, AEC sensor location, sensitivity, density, and grating. The X-ray radiation conditions set for each of the object sizes can be stored in the storage unit 170.

[0399] After setting the object size and X-ray radiation conditions, the capture unit 120 can capture a camera image when the object is positioned in front of the X-ray detector 200 for X-ray imaging. Additionally, the control unit 140 analyzes the camera image to determine the object's size (472). For example, the control unit 140 can apply edge detection to the camera image to extract the object's outline and can also estimate the approximate size of the object by taking into account the dimensions of the object's outline shown in the camera image, its SID, or SOD.

[0400] Search for X-ray radiation conditions corresponding to the object size (473). Then, control the X-ray source based on the found X-ray radiation conditions (474). In addition, when the X-ray radiation conditions stored corresponding to the object size include conditions related to the X-ray detector 200, the X-ray detector 200 can also be controlled.

[0401] Some of the operations in the aforementioned X-ray imaging equipment and its control methods can be stored as programs on a computer-readable recording medium. The recording medium can be a magnetic recording medium such as a read-only memory (ROM), floppy disk, or hard disk, or an optical recording medium such as a CD-ROM or digital versatile disc (DVD). However, the type of recording medium is not limited to the examples above.

[0402] The recording medium may be included in the server that provides the application or program, and the workstation, sub-display device, or mobile device may access the server via a communication protocol such as the Internet to download the corresponding program.

[0403] For example, when the display unit 150 and the input unit 160 are included in a mobile device, the above-mentioned screen can be displayed on the display unit 150 after the mobile device downloads, installs and executes the program.

[0404] Some of the steps involved in performing the operations of the control unit 140 described above can be included in the program. In this case, the mobile device can generate control commands and send the control commands to the X-ray imaging device 100.

[0405] Alternatively, the mobile device may send information related to control commands input by the user to the X-ray imaging device 100, and the control unit 140 may control the X-ray imaging device 100 according to the control commands input by the user.

[0406] According to one aspect of the X-ray imaging equipment and its control method, various types of parameters related to X-ray imaging, including the X-ray radiation area, can be set using camera images, and X-ray imaging can be automatically controlled.

[0407] The above description is merely illustrative of the technical spirit of this disclosure. Those skilled in the art should be able to make various modifications, alterations, and substitutions without departing from the essential characteristics of this disclosure. Therefore, the above-disclosed embodiments and drawings are for describing, not limiting, the technical spirit of this disclosure, and the scope of the technical spirit is not limited by the embodiments and drawings. This scope should be interpreted through the following claims, and all technical spirit within the equivalent scope of the claims should be interpreted as falling within the scope of this disclosure.

Claims

1. An X-ray imaging device, comprising: The camera is configured to capture live camera images of the target; An X-ray source is configured to generate X-rays; The collimator is configured to adjust the X-ray radiation area being irradiated by X-rays; The touchscreen is configured to display the live camera image of the target, a top line indicating the start of the stitching area and a bottom line indicating the end of the stitching area, which are superimposed on the live camera image. as well as The controller is configured to: control the tilt angle of the X-ray source according to each of the positions of a plurality of segmented regions constituting the X-ray radiation region, to capture a plurality of X-ray images corresponding to the plurality of segmented regions; and automatically stitch the plurality of X-ray images to generate a single X-ray image corresponding to the X-ray radiation region. The touchscreen is configured to receive commands from the user for moving at least one of the top and bottom lines to specify the stitching area. The controller is configured to automatically divide the splicing area into the plurality of partitioned areas based on the height of the splicing area defined by the top line and the bottom line. The controller is configured to control the tilt angle of the X-ray source to a corresponding angle corresponding to each of the plurality of segmented regions, so as to sequentially capture the plurality of X-ray images and automatically stitch the plurality of X-ray images to generate the X-ray image corresponding to the stitched region.

2. The X-ray imaging device according to claim 1, wherein, The controller is configured to perform real-time division of the splicing area whenever the top line or the bottom line is moved, and the touchscreen is configured to display guide lines for dividing the plurality of division areas and a number assigned to each of the plurality of division areas.

3. The X-ray imaging device according to claim 2, wherein, When the splicing area is reduced by moving at least one of the top line and the bottom line, the controller is configured to reduce the number of the plurality of partitioned areas.

4. The X-ray imaging device according to claim 1, wherein, The bottom line is initially displayed at the lower end of the live camera image.

5. The X-ray imaging apparatus according to claim 1, wherein, The touchscreen is configured to display the overlapping region by overlaying the overlapping region onto the live camera image, wherein adjacent subdivision regions among the plurality of subdivision regions overlap each other in the overlapping region.

6. The X-ray imaging apparatus according to claim 5, wherein, The touchscreen is configured to receive commands from the user for moving the overlapping area.

7. The X-ray imaging apparatus according to claim 1, wherein, The controller is configured to compare the camera image captured at the previous imaging time point with the current camera image to detect the movement of the target, and to stop stitching the image when the detected movement is equal to or greater than a preset reference value.

8. The X-ray imaging apparatus according to claim 7, wherein, When the stitched image is restored, the touchscreen is configured to display the camera image by overlaying the camera image captured during the previous segmentation imaging onto the current camera image to guide the orientation of the target.

9. The X-ray imaging apparatus according to claim 1, wherein, The touchscreen is configured to display a plurality of segmented windows corresponding to the plurality of segmented regions superimposed on the live camera image, and the touchscreen is configured to receive from the user a command for adjusting the width of at least one of the plurality of segmented windows.

10. The X-ray imaging apparatus according to claim 9, wherein, The controller is configured to extract the contour of the target from the live camera image and determine the width of the X-ray radiation area of ​​at least one of the plurality of segmented regions based on the boundary between the extracted contour and the background.

11. The X-ray imaging apparatus according to claim 1, further comprising: The memory is configured to map and store the stitching region for each of a plurality of X-ray imaging protocols, wherein when one of the plurality of X-ray imaging protocols is selected, the controller is configured to set the top line and the bottom line at the position corresponding to the selected X-ray imaging protocol.

12. The X-ray imaging apparatus according to claim 1, further comprising: A memory is configured to store X-ray radiation conditions for each of a plurality of sizes of the target, wherein a controller is configured to identify the size of the target based on the live camera images and to perform X-ray imaging by applying X-ray radiation conditions mapped to the identified size of the target.

13. The X-ray imaging apparatus according to claim 12, wherein, The touchscreen is configured to display X-ray radiation conditions for the selected size of the target among the plurality of sizes in response to the selection of the target size.

14. The X-ray imaging apparatus according to claim 1, wherein, The controller is configured to identify the boundaries of the X-ray detector from the live camera image and determine whether at least one of the plurality of segmented regions is within the boundaries of the X-ray detector.

15. The X-ray imaging apparatus according to claim 14, wherein, The touchscreen is configured to use different colors to display areas within the boundaries of the X-ray detector and areas outside the boundaries of the X-ray detector.

Images