Digital tomographic image acquisition device and control method therefor

Abstract

A digital tomographic image acquisition device is proposed according to an embodiment of the present invention, which may include a generator configured to generate X-rays in a plurality of irradiation regions; a detector configured to detect a plurality of pieces of reading data corresponding to the X-rays generated in the plurality of irradiation regions; and a processor configured to obtain an input for a region of interest among detection regions of the detector and determine an irradiation region corresponding to the region of interest among the plurality of irradiation regions.

Description

Digital tomography image acquisition device and method for controlling the same

[0001] The present invention relates to a digital tomographic image acquisition device and a method for controlling the same, and more specifically, to a rotation-free tomographic image acquisition device and a method for controlling the same.

[0002] Digital tomosynthesis is an imaging diagnostic technology that combines the advantages of conventional X-ray technology and tomography. It is a method that reconstructs 3D images using X-ray images taken from multiple angles.

[0003] Digital tomography can be configured as follows.

[0004] X-ray imaging: The X-ray device captures multiple images from various angles centered on the area being examined. In this case, the radiation exposure is similar to that of standard 2D X-ray imaging.

[0005] Image reconstruction: Multiple captured images are processed by a processor or computer to reconstruct them in 3D. This allows cross-sections to be viewed layer by layer, making it possible to see even minute lesions that were not visible in conventional 2D X-ray images more clearly.

[0006] Tomographic image analysis: 3D images can be analyzed by slice at a specific depth, which increases diagnostic accuracy by separating tissues that appear to overlap.

[0007] As mentioned earlier, digital tomography can more accurately detect small lesions or abnormalities that are easily missed in 2D X-ray images, making it advantageous for the early diagnosis of various diseases. Furthermore, it can provide 3D images similar to or equivalent to computed tomography (CT) while having lower radiation exposure. Additionally, by resolving the problem of tissue overlapping, it allows for clearer visualization of lesions, thereby increasing diagnostic accuracy.

[0008] Meanwhile, Scout View is a function used in computed tomography (CT) scanners, and it is a low-dose X-ray scan performed to confirm the patient's exact imaging position in advance of the standard scan (CT scan). Although Scout View is a low-dose scan with low radiation exposure, the target object is still exposed to radiation, so a method to avoid this is required.

[0009] The present invention aims to provide a digital tomography image acquisition device for faster and lower radiation exposure digital tomography in the digital tomography technology described above, and a control method for the same.

[0010] According to one embodiment of the present invention, a digital tomography image acquisition device is proposed, wherein the device may be configured to include: a generator configured to generate X-rays in a plurality of irradiation areas; a detector configured to detect a plurality of readout data corresponding to the X-rays generated in the plurality of irradiation areas; a camera configured to acquire an image of the detection area of ​​the detector; and a processor configured to acquire an input for a region of interest in the image of the detection area of ​​the detector and to determine an irradiation area corresponding to the region of interest in the plurality of irradiation areas.

[0011] Additionally or alternatively, the processor may be configured to control the irradiation field area of ​​the generator according to the determined irradiation area.

[0012] Additionally or alternatively, the processor may enable the detector to acquire read data in a detection area corresponding to the determined investigation area within the entire detection area of ​​the detector.

[0013] Additionally or alternatively, the processor may be configured to use the reading data obtained from the detection area corresponding to the determined investigation area within the entire detection area of ​​the detector for the reconstruction of a three-dimensional reading image.

[0014] Additionally or alternatively, the input for the region of interest may include a selection of at least some regions within the image for the detection region.

[0015] Additionally or alternatively, the processor may be configured to determine an investigation area corresponding to the area of ​​interest using the deformation ratio between the shape of the detection area included in the detection area image and the reference shape of the detection area.

[0016] Additionally or alternatively, the processor may be configured to acquire the coordinates of the detection area corresponding to at least some area and to determine an investigation area corresponding to the acquired coordinates of the detection area.

[0017] Additionally or alternatively, the processor may determine a movement path of the generator corresponding to the determined irradiation area, and control the generator to generate X-rays at one or more irradiation points corresponding to the determined irradiation area while moving along the determined movement path, and control the detector to detect read data in a detection area corresponding to the determined irradiation area.

[0018] Additionally or alternatively, the processor may control the generator to move along a preset path of the generator to generate X-rays at one or more irradiation points corresponding to the determined irradiation area, and the detector to detect read data in a detection area corresponding to the determined irradiation area.

[0019] Additionally or alternatively, the processor can control the size of the generator's irradiation area to a different size at the first irradiation point and the second irradiation point of the determined irradiation area.

[0020] Additionally or alternatively, the camera may be configured to include an RGB camera or an infrared camera.

[0021] Additionally or alternatively, the device may be configured to further include an illumination that emits light to indicate the center or a specific part of the detection area of ​​the detector.

[0022] Additionally or alternatively, the device may be configured to further include a depth camera for measuring the distance to the object to be photographed. The processor may be configured to obtain thickness information of the object to be photographed using the distance to the object to be photographed, and to obtain a three-dimensional reading image from the reading data by reflecting the obtained thickness information of the object to be photographed in a reconstruction parameter.

[0023] Additionally or alternatively, if the processor cannot obtain the thickness information using the distance to the object to be photographed, it may be configured to obtain a three-dimensional reading image from the reading data by reflecting the thickness information entered by a lookup table or a user into a reconstruction parameter.

[0024] Additionally or alternatively, the processor may be configured to correct the distance value obtained by the depth camera using angle information between the viewing direction of the depth camera and the plane as the depth camera is tilted with respect to the plane formed by the detection area.

[0025] Additionally or alternatively, the device may be configured to further include a display configured to output a user interface configured to acquire input for a region of interest among the detection regions of the detector.

[0026] Additionally or alternatively, the user interface may be configured to output the detection area image.

[0027] According to another embodiment of the present invention, a method for acquiring a digital tomographic image is proposed, wherein the method is performed by a digital tomographic image acquisition device comprising a detector and a generator, and may be configured to include the steps of: acquiring an input for a region of interest among the detection regions of the detector; determining an irradiation region corresponding to the region of interest among the plurality of irradiation regions; emitting X-rays in the determined irradiation region; and detecting readout data corresponding to the emitted X-rays.

[0028] Additionally or alternatively, the method may include the step of controlling the irradiation field area of ​​the generator according to the determined irradiation area.

[0029] Additionally or alternatively, the method may include the step of acquiring read data in a detection area corresponding to the determined irradiation area among the entire detection area of ​​the detector.

[0030] Additionally or alternatively, the method may include the step of using the reading data obtained from the detection area corresponding to the determined irradiation area within the entire detection area of ​​the detector to reconstruct a three-dimensional reading image.

[0031] According to another embodiment of the present invention, a computer-readable medium is proposed that stores code configured to execute the digital tomographic image acquisition method described above by a computer or processor.

[0032] The above-mentioned problem-solving methods are merely some of the embodiments of the present invention, and various embodiments reflecting the technical features of the present invention can be derived and understood by those skilled in the art based on the detailed description of the present invention to be described below.

[0033] The present invention has the following technical effects.

[0034] The present invention can provide alignment of the image area of ​​a target object using an optical camera without X-ray irradiation, replacing the scout view which acquires an image by irradiating a small amount of X-rays to align the image area of ​​a recipient, i.e., a target object.

[0035] In addition, the present invention can reduce the amount of radiation exposure by selecting the imaging area of ​​a target object and limiting the irradiation area so that X-rays are irradiated only to the selected area.

[0036] In addition, the present invention can obtain a three-dimensional X-ray image from a two-dimensional X-ray image by obtaining thickness information, height information, etc. of a target object and using reconstruction parameters that reflect the same.

[0037] The effects according to the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the following detailed description of the invention.

[0038] The accompanying drawings, which are included as part of the detailed description to aid in understanding the present invention, provide embodiments of the present invention and explain the technical concept of the present invention together with the detailed description.

[0039] FIG. 1 illustrates a conceptual diagram of non-rotating X-ray imaging according to the present invention.

[0040] FIG. 2 is a diagram illustrating the type of X-ray generator of a digital tomography image acquisition device according to the present invention.

[0041] FIG. 3 illustrates a detection area of ​​a digital tomographic image acquisition device according to the present invention, a target object located thereon, and a region of interest.

[0042] FIGS. 4 and 5 show the relationship between an image of a target object captured according to the present invention, a detection area of ​​a digital tomography image acquisition device, and an irradiation area.

[0043] FIG. 6 illustrates the activation or control of an investigation area according to the present invention.

[0044] FIG. 7 shows an image of a scene in which a mark for guiding the irradiation of an X-ray generator is projected onto a target object according to the present invention.

[0045] FIG. 8 shows a flowchart of a method for obtaining relationship information between an image of a target object captured according to the present invention, a detection area of ​​a digital tomography image acquisition device, and an investigation area.

[0046] FIG. 9 shows a flowchart of a method for controlling an investigation area for an area of ​​interest set through an image of a target object according to the present invention.

[0047] FIGS. 10 and FIGS. 11 are drawings for explaining the acquisition of height (position) or thickness information of a target object according to the present invention.

[0048] FIG. 12 shows a flowchart of a method for obtaining reconstruction parameters using height or thickness information of a target object according to the present invention.

[0049] FIG. 13 illustrates a block diagram of a digital tomographic image acquisition device according to the present invention.

[0050] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components regardless of drawing symbols will be assigned the same reference number, and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the ease of drafting the specification and do not inherently possess distinct meanings or roles. Furthermore, in describing embodiments disclosed in this specification, if it is determined that a detailed description of related prior art could obscure the essence of the embodiments disclosed in this specification, such detailed description will be omitted. Additionally, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification; the technical concept disclosed in this specification is not limited by the attached drawings, and it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and technical scope of the present invention.

[0051] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0052] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0053] A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0054] In this application, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0055]

[0056] FIG. 1 illustrates a conceptual diagram of non-rotating X-ray imaging according to the present invention.

[0057] A device for acquiring a digital tomographic image (or a device for capturing a digital tomographic image, hereinafter referred to as the “digital tomographic image acquisition device”) acquires a plurality of two-dimensional X-ray images and reconstructs the plurality of images to acquire a three-dimensional tomographic image.

[0058] Since multiple images are captured during this process, the capture time required ranges from a few seconds to tens of seconds. In particular, as the resolution of the detector increases, the time required to read the sensing value from each cell of the detector increases.

[0059] According to the present invention, it is possible for an X-ray generator to generate X-rays only in a selected irradiation area without generating X-rays in the entire irradiation area, or for an X-ray generator to generate X-rays in the entire irradiation area but for a collimator of the X-ray generator to control the irradiation field so that X-rays are emitted only in a selected irradiation area.

[0060]

[0061] FIG. 2 is a diagram illustrating the type of X-ray generator of a digital tomography image acquisition device according to the present invention.

[0062] FIG. 2(a) shows the sequential movement of the irradiation area when the generator is configured as a single X-ray source (or generator) unit and the generator is configured to be movable. Referring to FIG. 2(a), the irradiation area is set according to a zigzag pattern from the upper left irradiation area toward the right, and the generator moves accordingly.

[0063] FIG. 2(b) shows an irradiation area when the generator is composed of multiple X-ray source (or generating) units and arranged in a two-dimensional form. Each point in FIG. 2(b) may represent one X-ray source unit.

[0064] In the preceding description, it was explained that only one of the plurality of X-ray source units is activated (i.e., X-ray emission) at a single point in time (X-ray irradiation cycle or reading cycle), but the present invention is not limited thereto. Two or more X-ray source units may be activated simultaneously, and two or more corresponding detection areas may be activated simultaneously. That is, the detector may activate multiple detection areas and read sensing data in parallel.

[0065]

[0066] FIG. 3 illustrates a detection area of ​​a digital tomographic image acquisition device according to the present invention, a target object located thereon, and a region of interest.

[0067] FIG. 3 shows a target object (Obj) placed in the detection area (10) of a detector of a digital tomography image acquisition device. The detection area (10) may be referred to as an active area.

[0068] Conventionally, a target object is positioned in a detection area (10), and a cross-sectional image is obtained by irradiating the entire detection area (10) with X-rays. Additionally, prior to obtaining the cross-sectional image, a small amount of X-rays is irradiated onto the target object to check whether the inspection area is properly aligned with the detection area (10).

[0069] However, in order to reduce the radiation exposure to the target object, the present invention proposes a method to enable setting or selecting a region of interest (A) among the target objects (Obj) in the detection area through an acquired image, and to allow X-rays to be irradiated only to the region of interest (A). However, the region of interest (A) and the actual area where X-rays are irradiated may not be exactly the same. Preferably, a minimum irradiation area including the region of interest (A) is formed.

[0070]

[0071] FIGS. 4 and 5 show the relationship between an image of a target object captured according to the present invention, a detection area of ​​a digital tomography image acquisition device, and an irradiation area.

[0072] The following explanation will be provided with reference to Fig. 4.

[0073] FIG. 4(a) illustrates an image (20) obtained by photographing a target object (Obj) located in the detection area of ​​a detector. The image (20) can be obtained through an RGB camera or an infrared (or thermal imaging) camera (hereinafter referred to as “camera”). It is preferable that the camera be installed so as not to interfere with the X-ray generator of the digital tomography acquisition device. Being installed so as not to interfere means that, as in FIG. 2(a), when the generator emits X-rays while moving sequentially, the installation position of the camera does not interfere with the movement or motion of the generator. Furthermore, even if the generator is not of the type that moves sequentially, it means that the installation position of the camera does not interfere with the position of the generator. Additionally, it is preferable that the camera be installed perpendicular to the plane formed by the detection area of ​​the detector.

[0074] In FIG. 4(a), a user (or inspector) can set or select a region of interest (ROI) on the image (20). As illustrated in FIG. 4(a), a digital tomography image acquisition device may include a display for outputting the image (20). A user interface for selecting a region of interest (ROI) in the image (20) may be provided, and the user may select or set the region of interest (ROI) through the user interface using touch input or peripheral devices such as a keyboard or mouse.

[0075] FIG. 4(b) illustrates a detection area (10) of a detector and a detection area of ​​interest (A) corresponding to a region of interest (ROI). The detection area (10) in FIG. 4(b) is shown to have the same size as the image (20) in FIG. 4(a), and the region of interest (ROI) and the detection area of ​​interest (A) are also shown to have the same size, but this is merely an example and the size does not limit the invention.

[0076] It is necessary to obtain a matching relationship between the region of interest (ROI) of FIG. 4(a) and the area of ​​interest detection (A) of FIG. 4(a). The present invention is intended to replace the conventional scout view, because the area of ​​interest detection (A) corresponding to the selection of the region of interest (ROI) must be selected.

[0077] FIG. 4(c) shows a point (IR_point) where X-rays emitted from an X-ray generator are irradiated onto a detection area (10). The irradiation area (30) is depicted as being identical to the detection area (10), but the present invention is not limited thereto. If the detection area (10) and the irradiation area (30) are identical, there is no need to obtain a matching relationship between the detection area (10) and the irradiation area (30). Conversely, if the detection area (10) and the irradiation area (30) are different, there is a need to obtain a matching relationship between the two. Ultimately, information regarding the irradiation area of ​​interest (IR) corresponding to the region of interest (ROI) or the detection area of ​​interest (A) must be obtained.

[0078] Accordingly, when the region of interest (ROI) is selected, the area of ​​interest detection (A) is determined, and accordingly, the area of ​​interest investigation (IR) and the investigation point (IR_point) are determined.

[0079] An X-ray generator or a processor configured to control the generator can determine the generator's irradiation point based on the region of interest (ROI) selected by the user. Since this exposes only a portion of the target object to X-rays, the exposure amount can be significantly reduced.

[0080]

[0081] Hereinafter, with reference to FIG. 5, the correspondence between the acquired image (21) and the investigation area (30) will be explained.

[0082] The acquired image (21) of FIG. 5 is an image corresponding to the detection area of ​​the detector, representing the part excluding the detection area (10) from the image (20) acquired by photographing the detection area with a camera. For example, if other parts around the detection area (10) are photographed in the acquired image (20), the acquired image (21) can be provided by removing said other parts from the acquired image (20).

[0083] FIG. 5(a) shows the case where the camera for acquiring images (20, 21) is perpendicular to the plane formed by the detection area (10) of the detector. FIG. 5(b) also shows the case where the camera for acquiring images (20, 21) is not perpendicular to the plane formed by the detection area (10) of the detector.

[0084] In both cases, the edges of the acquired image (21) are detected, and additionally, the center of each acquired image (21) is detected, and the coordinates of the edges or the center can be obtained. In addition, a ratio based on the difference between the shape of the acquired image (21) and the shape of the investigation area (30), such as a size ratio or a rotation ratio, is obtained, and accordingly, the correspondence relationship between each edge of the acquired image (21) and each edge of the investigation area (30) can be obtained.

[0085] For example, the relationship between the acquired image (21) and the investigation area (30) can be represented as follows.

[0086]

[0087] Here, R represents a transformation matrix, and the coordinates of the acquired image (21) can be transformed into the coordinates of the investigation area (30) according to the transformation matrix.

[0088] More specifically, the matching relationship between a point in the acquired image (21) and an investigation point (IR_point) can be obtained as a transformation matrix, and accordingly, information about an investigation point (IR_point) corresponding to a selected area, i.e., an ROI, in the acquired image (21) can be obtained.

[0089] Meanwhile, although FIG. 5 describes the correspondence between the acquired image (21) and the investigation area (30), this can be applied equally to the correspondence between the acquired image (21) and the detection area (10). That is, the edges of the acquired image (21) are detected, and additionally, the centers of each acquired image (21) are detected, and the coordinates of the edges or centers can be obtained. In addition, ratios based on the difference between the shape of the acquired image (21) and the shape of the detection area (10), such as size ratios and rotation ratios, are obtained, and accordingly, the correspondence between each edge of the acquired image (21) and each edge of the detection area (10) can be obtained.

[0090]

[0091] FIG. 6 illustrates the activation or control of an investigation area according to the present invention.

[0092] Referring to Fig. 6, the investigation area is divided into a total of 42 sub-investigation areas, and the center or specific location of each sub-investigation area can correspond to the investigation point (IR_point) described earlier.

[0093] Figure 6 (a) shows that the entire irradiation area is activated, and accordingly, the emission of X-rays from all irradiation points can be controlled.

[0094] Figure 6(b) shows that some of the irradiation areas are activated, and accordingly, the emission of X-rays from selected irradiation points can be controlled.

[0095] Meanwhile, the size of the area of ​​interest detection region, that is, the area where X-rays are emitted from an activated irradiation point and reach the detection region, can be varied through the control of the collimator of the X-ray generator. For example, FIG. 6 shows a single irradiation point emitting X-rays in a sub-irradiation region using hatching for the sake of simplicity of illustration, but in reality, X-rays may reach a smaller or larger area through the control of the collimator according to the control of the X-ray generator or processor. To do this, the X-ray generator or processor, etc., must be able to accurately correspond information about the region of interest (ROI) of the acquired image (20, 21) with the irradiation region (30).

[0096]

[0097] FIG. 7 shows an image of a scene in which a mark for guiding the irradiation of an X-ray generator is projected onto a target object according to the present invention.

[0098] In order to capture a mark (M) indicating the center of the detection area (10) on the acquired image (20), a mark (M) is illuminated onto the target object (Obj) using lighting.

[0099] To this end, the digital tomographic image acquisition device according to the present invention may be configured to have a lighting device at an uninterfering location near a generator or optical camera.

[0100] Alternatively, when the acquired image (20) is output on the display, control can be exercised so that a mark (M) indicating the center of the detection area (10) is output on the acquired image (20). To this end, relationship information between the acquired image (20, 21) and the detection area (10), as described in FIGS. 4 and 5, is required.

[0101] This allows the imaging target area of ​​the target object (Obj) to be guided to be positioned in the center of the detector.

[0102] In addition, if the target object cannot be visually identified (e.g., if the target object is covered with a sterile transparent vinyl), an attempt can be made to acquire an image using a thermal imaging (infrared) camera. In this case as well, a mark (M) of the illumination device can be irradiated onto the target object (Obj), and before emitting X-rays, the area of ​​the target object to be photographed can be positioned at the center of the detection area using the mark (M) via a display or the like in real time.

[0103] In addition, it can be configured to display not only the mark (M) but also related additional information.

[0104]

[0105] FIG. 8 shows a flowchart of a method for obtaining relationship information between an image of a target object on a detection area according to the present invention, a detection area of ​​a digital tomography acquisition device, and an investigation area. The method illustrated in FIG. 8 may be performed on a digital tomography acquisition device or its processor according to the present invention, but the present invention is not limited thereto. Hereinafter, the “device (100)” will be described as performing the method of FIG. 8.

[0106] The device (100) may be configured to perform alignment between the camera and the detector (S810). Preferably, alignment may be performed so that the center of the camera and the center of the detection area of ​​the detector coincide. Additionally, the device may be configured so that the image area acquired by the camera, i.e., the image area output to a display, etc., and the detection area of ​​the detector coincide through adjustment of the camera's lens focal length, shooting distance, or zoom / ratio.

[0107] The device (100) can be configured to obtain a matching relationship between an image obtained through a camera, a detection area, and an investigation area (S820).

[0108] To this end, the device (100) may be configured to detect edges of a detection area in an image obtained through a camera, and to obtain the coordinates of the detected edges and the center coordinates of the edges.

[0109] Additionally, the device (100) can acquire mutually corresponding coordinate information between the detection area and the investigation area within the acquired image. That is, as shown in FIG. 5, the device (100) may be configured to acquire coordinate information of the edges of the acquired image (21) and the investigation area (30), or to acquire coordinate information of an area or point within the acquired image (21) and a corresponding area or point within the investigation area (30).

[0110] The matching relationship may include not only mutually corresponding coordinate information between the acquired image and the investigation area, but also the deformation ratio of geometric structures such as size and shape between the acquired image and the investigation area.

[0111] The device (100) may be configured to store the acquired matching relationship in a storage medium such as memory (S830).

[0112]

[0113] FIG. 9 shows a flowchart of a method for controlling an investigation area for a region of interest set through an image of a target object captured according to the present invention. The method illustrated in FIG. 9 may be performed on a digital tomography image acquisition device or its processor according to the present invention, but the present invention is not limited thereto. Hereinafter, the “device (100)” will be described as performing the method of FIG. 9.

[0114] The device (100) can be configured to receive a selection of a region of interest (ROI) in an acquired image output on a display (S910).

[0115] The device (100) may be configured to determine an investigation area corresponding to the selection of an area of ​​interest (S920). At this time, the matching relationship between the acquired image, the detection area, and the investigation area described in FIGS. 4 to 5 and FIG. 8 may be used.

[0116] The device (100) may be configured to control an X-ray generator according to a determined irradiation area (S930). More specifically, the device (100) may be configured to control the collimator of the X-ray generator to adjust the direction, size, and irradiation range of the X-ray beam. Accordingly, since X-rays are irradiated only on a part of the area selected as an area of ​​interest rather than the entire area of ​​the target object, the amount of exposure can be reduced.

[0117] As shown in FIG. 2(a), when an X-ray generator generates X-rays while moving along a path, the determined irradiation area may correspond to some of the points shown in FIG. 2(a), and accordingly, the generator may be controlled to generate X-rays only at some of the points. For convenience of explanation, each of the irradiation areas shown in FIG. 2(a) will be referred to as an “irradiation point.” That is, while the X-ray generator moves along a preset path, it may generate X-rays only at one or more irradiation points corresponding to the determined irradiation area. Additionally, the detector detects reading data in the detection area corresponding to the determined irradiation area.

[0118] Alternatively, instead of a preset movement path as in FIG. 2(a), the device (100) may be configured to determine a movement path corresponding to a determined irradiation area. That is, the generator may move differently from that shown in FIG. 2(a). For example, if the determined irradiation area does not include the right area of ​​FIG. 2(a), the movement path of the generator may be limited to the left area of ​​FIG. 2(b). While moving along the newly determined movement path, the generator may generate X-rays at one or more irradiation points corresponding to the determined irradiation area. Additionally, the detector detects read data in a detection area corresponding to the determined irradiation area.

[0119] Meanwhile, the irradiation field of the generator at each irradiation point can be adjusted differently. This is to form an irradiation area that matches the region of interest as closely as possible. That is, the region of interest (e.g., selected by the user) in the image acquired through the camera may not consist of an irradiation field of the same size at each irradiation point. While a maximum irradiation field may be required at some irradiation points, a smaller irradiation field may be required at others. This implies that irradiation field control is necessary, and as previously explained, the irradiation field at each irradiation point can be adjusted by controlling the collimator of the X-ray generator.

[0120]

[0121] FIG. 10 is a figure for explaining the position or thickness information of a target object according to the relationship between the detection area of ​​a detector and a target object according to the present invention.

[0122] FIG. 10 (a) illustrates a situation in which a target object (Obj) is in contact with the detection area (11) of the detector, and FIG. 10 (b) illustrates a situation in which a target object (Obj) is positioned on the detection area (11) of the detector.

[0123] FIG. 10 illustrates a situation in which a depth camera or generator is installed perpendicular to the plane (XY plane) formed by the detection area of ​​the detector.

[0124] FDD represents the distance from the depth camera or generator to the detector (11), and FOD represents the distance from the camera or generator to the target object (Obj). ODD represents the distance from the target object to the detector. FDD, FOD, ODD, etc. correspond to values ​​that can be known in advance or values ​​that can be obtained through the depth camera.

[0125] Dist_obj_top represents the top height of the target object, and Dist_obj_btm represents the bottom height of the target object. Dist_obj_thickness represents the thickness of the target object.

[0126] In Figures 10 (a) and (b), Dist_obj_thickness can be obtained as Dist_obj_btm - Dist_obj_top.

[0127] In FIG. 10 (b), C_wcz_Dist_off1 represents the Z-axis distance offset between the generator plane (or generator center axis) and the camera plane (or camera center optical axis). C_wcz_Dist_off2 represents the Z-axis distance offset between the detection area plane and the center optical axis plane of the depth camera at the bottom. The camera plane is the Xe, Ye plane based on the center cp_c (a1, b1, c1) of the Xwc, Ywc, and Zwc axes, and the generator plane is the Xe, Ye plane based on the center cp_e (a2, b2, c2) of the Xe, Ye, and Ze axes.

[0128] Dist_obj_top and Dist_obj_btm can be values ​​that can be obtained by a depth camera.

[0129]

[0130] FIG. 11 is a figure for explaining the position or thickness information of a target object according to the relationship between the detection area of ​​the detector and the target object according to the present invention.

[0131] FIG. 11 (a) illustrates a situation where the target object is on a bed and the detection area of ​​the detector is in contact with the bottom surface of the bed, and FIG. 11 (b) illustrates a situation where the target object is on a bed and the bottom surface of the bed and the detection area of ​​the detector are separated.

[0132] FDD represents the distance from the depth camera or generator to the detector (11), and FOD represents the distance from the camera or generator to the target object (Obj). ODD represents the distance from the target object to the detector. FDD, FOD, ODD, etc. correspond to values ​​that can be known in advance or values ​​that can be obtained through the depth camera.

[0133] FIG. 11 illustrates a situation in which a camera or generator is installed perpendicular to the plane (XY plane) formed by the detection area of ​​the detector.

[0134] Unlike in Fig. 10, information on the thickness of the bed (Dist_bed_thickness) is added, and the distance from the bottom surface of the detector's detection area to the top surface of the bed (Dist_bed_top) and the distance from the bottom surface of the detector's detection area to the bottom surface of the bed (Dist_bed_btm) are added.

[0135] In addition, in Fig. 11 (a), C_wcz_Dist_off2 represents the Z-axis distance offset between the bottom of the detector and the detection plane.

[0136] In Fig. 11 (a), the thickness of the target object, Dist_obj_thickness = Dist_obj_btm - Dist_obj_top or Dist_obj_thickness = (FDD-Dist_bed_top) - Dist_obj_top.

[0137] In Fig. 11 (b), the lowest height of the target object, Dist_object_btm = FDD - (Dist_bed_btm + Dist_bed_thickness), can be determined.

[0138] In this way, the thickness of the target object can be obtained through a depth camera. Accordingly, the tomographic imaging device according to the present invention may include a depth camera or obtain thickness information of the target object from the depth camera. The thickness information of the target object may be reflected in reconstruction parameters when obtaining a three-dimensional tomographic image from a two-dimensional tomographic image. For example, the slice interval, illumination angle range, voxel size, artifact correction, etc., may be adjusted according to the thickness of the target object.

[0139]

[0140] FIG. 12 shows a flowchart of a method for configuring reconstruction parameters related to obtaining thickness information of a target object according to the present invention. FIG. 12 can be performed by a tomographic image acquisition device according to the present invention, and the tomographic image acquisition device will be described in detail with reference to FIG. 13. Hereinafter, the method of FIG. 12 will be described as being performed by the device (100).

[0141] The device (100) can obtain height information of a target object using a depth camera. Here, the height information may include the top height of the target object or the bottom height of the target object.

[0142] The device (100) can check whether it has obtained the top height information of the target object and the bottom height information of the target object (S1220).

[0143] As the uppermost height information and lowermost height information of the target object are obtained through the depth camera, the device (100) may be configured to obtain thickness information of the target object (S1230). That is, the thickness information of the target object can be obtained by subtracting the uppermost height of the target object from the lowermost height of the target object. The reference for the height information may be the location where the depth camera or (x-ray) generator is located, rather than the plane forming the detection area of ​​the detector, and thus represents the distance from the location of the depth camera or generator. However, conversely, the reference for the height information may be obtained based on the plane forming the detection area of ​​the detector.

[0144] The device (100) can be configured to acquire a three-dimensional image from a two-dimensional image using reconstruction parameters that reflect the acquired thickness information (S1240).

[0145] If the uppermost height information of the target object and the lowermost height information of the target object are not obtained through the depth camera, the device (100) may be configured to obtain thickness information of the target object from a lookup table that records average values ​​for thickness or width, etc., for each body part (S1250). Alternatively, the device (100) may be configured to obtain thickness information of the target object directly input by the user (S1250). The device (100) may be configured to obtain a three-dimensional image from a two-dimensional image using reconstruction parameters that reflect the obtained thickness information of the target object (S1250).

[0146]

[0147] FIG. 13 illustrates a block diagram of a digital tomographic image acquisition device (100) according to the present invention.

[0148] A digital tomography image acquisition device (100) may include a generator (1100) configured to generate and irradiate X-rays, and a detector (1200) configured to detect X-rays that have passed through a target object or readout data corresponding to X-rays that have passed through a target object. A controller may be embedded in each of the generator (1100) and the detector (1200) to control the operation of the generator and the detector.

[0149] Additionally, the digital tomography image acquisition device (100) may include a processor (1300). This may be the case where there is no controller in either the generator (1100) or the detector (1200). The processor (1300) may control the emission of X-rays or the collimator of the generator (1100), or control the reading of sensor data by the detector (1200). Additionally, the processor (1300) may control a human-machine interface (1500) or a transceiver (not shown) to be described later.

[0150] Additionally, the digital tomography image acquisition device (100) may include a human-machine interface (HMI) (1500) for outputting the acquired tomography image or a three-dimensional tomography image acquired from the tomography image. The human-machine interface (HMI) (1500) may include a display.

[0151] Additionally, the digital tomographic image acquisition device (100) may include a transceiver (not shown) for transmitting the acquired tomographic image or a three-dimensional tomographic image acquired from the tomographic image to another device or system. Additionally, the transceiver (not shown) may be configured to receive information for logic, algorithms, or logic, algorithms, etc., for acquiring or calibrating the tomographic image, or for directing the sequence or method of X-ray emission by the generator (1100) or the source unit of the generator (1100).

[0152] In the following description, the generator (1100) and the detector (1200) are described as performing the operation according to the present invention, but instead, the operation according to the present invention may be performed by a processor (1300).

[0153] The generator (1100) can be configured to emit X-rays in a preset sequence or at preset locations.

[0154] The detector (1200) may be configured to detect read data in a detection area corresponding to the generator or an irradiation area to be irradiated with X-rays generated by the generator.

[0155] The generator (1100) includes a plurality of X-ray source units and can be configured to sequentially irradiate X-rays onto an irradiation area set for each of the plurality of X-ray source units.

[0156] The generator (1100) includes a movable X-ray source unit and is configured to sequentially irradiate X-rays onto a detection area set for the movable X-ray source unit as the movable X-ray source unit moves, and the detection area may be part of the entire area where the generator can emit X-rays.

[0157] The processor (1300) may be configured to acquire an input for a region of interest among the detection regions of the detector. The processor (1300) may be configured to determine an irradiation region corresponding to the region of interest among a plurality of irradiation regions.

[0158] The region of interest can be configured to be selected from a detection area image obtained by capturing the detection area of ​​the detector. Additionally, the input for the region of interest may include a selection of at least a portion of the area within the detection area image.

[0159] The processor (1300) may be configured to control the irradiation field area of ​​the generator according to the determined irradiation area. The irradiation field of the generator may be controlled by controlling the collimator of the generator.

[0160] The processor (1300) can enable the detector to acquire read data in a detection area corresponding to a determined investigation area within the entire detection area of ​​the detector. According to this, an increase in the speed of data reading by the detector can be expected.

[0161] The processor (1300) may be configured to use the reading data obtained from the detection area corresponding to the determined irradiation area within the entire detection area of ​​the detector for the reconstruction of a three-dimensional reading image.

[0162] The processor (1300) may be configured to determine an irradiation area corresponding to an area of ​​interest by using the deformation ratio between the shape of the detection area included in the detection area image and the reference shape of the detection area. Additionally or alternatively, the processor (1300) may be configured to obtain the coordinates of a detection area corresponding to at least a portion of the area within the detection area image and to determine an irradiation area corresponding to the obtained coordinates of the detection area.

[0163] Additionally, the processor (1300) can determine a movement path of the generator (1100) corresponding to a determined irradiation area and control the generator (1100) to generate X-rays at one or more irradiation points corresponding to the determined irradiation area while moving along the determined movement path. Additionally, the processor (1300) can control the detector (1200) to detect read data in a detection area corresponding to the determined irradiation area.

[0164] Additionally, the processor (1300) can control the generator (1100) to generate X-rays at one or more irradiation points corresponding to a determined irradiation area while the generator (1100) moves along a preset movement path. Additionally, the processor (1300) can control the detector (1200) to detect read data in a detection area corresponding to the determined irradiation area.

[0165] Additionally, the processor (1300) can control the size of the irradiation field area of ​​the generator (1100) to be different for multiple irradiation points of the determined irradiation area. That is, the size of the irradiation field area at the first irradiation point and the second irradiation point among the determined irradiation areas can be set or controlled differently from each other.

[0166] The digital tomographic image acquisition device (100) may be configured to further include a camera (1400) configured to acquire an image of a detection area. The camera (1400) may include an RGB camera or an infrared camera. Additionally, the camera (1400) may include a depth camera configured to measure the distance to a target object.

[0167] Additionally, the digital tomographic image acquisition device (100) may be configured to further include a light or guide that emits light to indicate the center or a specific part of the detection area of ​​the detector.

[0168] Additionally, the processor (1300) may be configured to output an image of the detection area and a user interface that allows selecting some of the areas. The user interface may be configured to be displayed on a display (1500). In this case, the display or user interface may be configured to display a mark that guides the center of the detection area.

[0169] The digital tomographic image acquisition device (100) may be configured to further include a depth camera for measuring the distance to the object to be photographed. The processor (1300) may be configured to acquire thickness information of the object to be photographed using the distance to the object to be photographed, and to acquire a three-dimensional reading image from the reading data by reflecting the acquired thickness information of the object to be photographed in a reconstruction parameter. Alternatively, if the processor (1300) cannot acquire the thickness information using the distance to the object to be photographed, it may be configured to acquire a three-dimensional reading image from the reading data by reflecting thickness information input from a lookup table or a user in the reconstruction parameter.

[0170] Additionally, the processor (1300) may be configured to correct the distance value obtained by the depth camera using angle information between the viewing direction of the depth camera and the plane formed by the depth camera as the depth camera is tilted with respect to the plane formed by the detection area.

[0171]

[0172] Even without referring to FIG. 13, the digital tomographic image acquisition device (100) of the present invention may perform the operation according to the present invention as described above in FIG. 2 to 12.

[0173]

[0174] In addition, as another aspect of the present invention, the operation of the above-described proposal or invention may be provided as code that can be implemented, practiced, or executed by a "computer" (a comprehensive concept including a system on chip (SoC) or (micro)processor, etc.), or as a computer-readable storage medium or computer program product that stores or contains said code, and the scope of the present invention may be extended to said code or as a computer-readable storage medium or computer program product that stores or contains said code.

[0175]

[0176] The detailed description of the preferred embodiments of the present invention disclosed above is provided to enable those skilled in the art to implement and practice the present invention. Although the present invention has been described with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention as described in the following claims. Accordingly, the present invention is not intended to be limited to the embodiments shown herein, but to be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. In a digital tomography image acquisition device, A generator configured to generate X-rays in multiple irradiation zones; A detector configured to detect reading data corresponding to X-rays generated in at least one investigation area; A camera configured to acquire an image of the detection area of ​​the above detector; and A device comprising a processor configured to acquire an input for a region of interest in an image of a detection area of ​​the detector and to determine an irradiation area corresponding to the region of interest in a plurality of irradiation areas.

2. In paragraph 1, the processor, A device configured to control the irradiation field area of ​​the generator according to the above-determined irradiation area.

3. In paragraph 1, the processor, A device that enables the detector to acquire read data in a detection area corresponding to the determined investigation area within the entire detection area of ​​the detector.

4. In paragraph 1, the processor, A device configured to use reading data obtained from a detection area corresponding to a determined irradiation area within the entire detection area of ​​the detector for the reconstruction of a three-dimensional reading image.

5. In Paragraph 1, A device in which the input for the region of interest includes a selection of at least some region within an image for the detection region.

6. In paragraph 5, the above processor, A device configured to determine an investigation area corresponding to the area of ​​interest by using the deformation ratio between the shape of the detection area included in the detection area image and the reference shape of the detection area.

7. In paragraph 5, the above processor, Obtaining the coordinates of the detection area corresponding to at least some of the above areas, and A device configured to determine an investigation area corresponding to the coordinates of the above-mentioned acquired detection area.

8. In paragraph 7, the processor, Determining the movement path of the generator corresponding to the above-determined investigation area, and A device that controls the generator to move along the determined movement path, generate X-rays at one or more irradiation points corresponding to the determined irradiation area, and control the detector to detect read data in the detection area corresponding to the determined irradiation area.

9. In paragraph 7, the processor, A device that controls the generator to move along a preset movement path of the generator to generate X-rays at one or more irradiation points corresponding to the determined irradiation area, and controls the detector to detect read data in a detection area corresponding to the determined irradiation area.

10. In either Article 8 or Article 9, the processor A device for controlling the size of the irradiation field area of ​​the generator to a different size at the first irradiation point and the second irradiation point of the above-determined irradiation area.

11. In paragraph 1, the device comprising an RGB camera or an infrared camera.

12. The device according to claim 1, further comprising a light emitting light to indicate the center or a specific part of the detection area of ​​the detector.

13. In Paragraph 1, It further includes a depth camera for measuring the distance to the object to be photographed, and A device configured such that the processor acquires thickness information of the object to be photographed using the distance to the object to be photographed, and acquires a three-dimensional reading image from the reading data by reflecting the acquired thickness information of the object to be photographed in a reconstruction parameter.

14. In Paragraph 13, the above processor, A device configured to obtain a three-dimensional read image from the read data by reflecting thickness information input from a lookup table or a user into reconstruction parameters when the thickness information using the distance to the object to be photographed cannot be obtained.

15. In Paragraph 13, the processor, A device configured to correct a distance value obtained by the depth camera using angle information between the field of view of the depth camera and the plane as the depth camera is tilted with respect to the plane formed by the detection area.

16. In Paragraph 1, A device further comprising a display configured to output a user interface configured to acquire input for a region of interest among the detection regions of the detector.

17. In Paragraph 16, A device configured such that the above user interface outputs the above detection area image.

18. A method for acquiring a digital tomographic image, wherein the method is performed by a digital tomographic image acquisition device comprising a detector and a generator, and A step of acquiring input for a region of interest among the detection regions of the detector; A step of determining an investigation area corresponding to the area of ​​interest in a plurality of investigation areas; A step of emitting X-rays in the determined investigation area; and A method comprising the step of detecting read data corresponding to the emitted X-ray.

19. In Paragraph 18, A method comprising the step of controlling the irradiation field area of ​​the generator according to the determined irradiation area.

20. A computer-readable medium storing code configured to execute a method according to any one of paragraphs 18 to 19 by a computer or processor.

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