Radioactive ray imaging method and device

Abstract

According to the radioactive ray imaging method and device, a projection device is arranged in an X-ray emitting device, a projection image comprising a positioning attention item is projected to a plane assembly of an X-ray receiving device through the projection device to form a projection picture, so that a detected person is guided to perform positioning quickly and accurately, and in addition, the positioning accuracy is improved. When the spatial position relation between the X-ray emitting device and the X-ray receiving device is changed, the projection focal length of the projection device and / or the pixel information of the positioning attention item in the projection image can be adaptively adjusted. Therefore, the definition of the projection picture, the position and / or size of the positioning attention item in the projection picture and the position and / or size of the positioning attention item in the projection picture relative to the plane assembly are not influenced by the change of the spatial position relationship between the X-ray emitting device and the X-ray receiving device.

Description

Technical Field

[0001] The present invention relates to the field of radioactive ray imaging, and in particular to a method and device for radioactive ray imaging. Background Art

[0002] Radiographic imaging equipment, a common imaging system in medical digital imaging, is widely used in physical examinations and routine medical imaging diagnostics. Radiographic imaging equipment uses radioactive rays (such as X-rays) to pass through the subject to create an image.

[0003] Digital radiography (DR) equipment, for example, offers advantages such as fast imaging speed, low radiation dose, clear and detailed images, and the ability to examine the entire body. Positioning is a crucial step in the technician's examination process, with numerous requirements. For example, the subject's imaging area must be placed within the imaging plane and irradiation field to prevent incomplete coverage of the diagnostic area or the risk of excessive radiation. Another example is the need to adjust the subject's overall or partial posture to meet imaging requirements.

[0004] In actual situations, guiding the subject to position is mainly dependent on the radiological technician. Since there are many body positions that need to be guided and there is a lack of objective evaluation and measurement tools, how to quickly and accurately guide the subject to position has become a problem that troubles technicians. Summary of the Invention

[0005] In view of the above problems, the present invention proposes a method and apparatus for radioactive ray imaging, which are described in detail below.

[0006] According to a first aspect, an embodiment provides a radioactive ray imaging device, comprising:

[0007] An X-ray emitting device, used for emitting radioactive rays toward the person being examined;

[0008] An X-ray receiving device includes a detector and a planar component arranged on the transmission path of the radioactive rays, wherein the detector is used to receive the radioactive rays that pass through the subject;

[0009] a projection device, disposed in the X-ray emitting device;

[0010] a position detection device, configured to detect a spatial positional relationship between the X-ray emitting device and the X-ray receiving device;

[0011] Processor for:

[0012] Controlling the projection device to project a projection image onto the planar component of the X-ray receiving device to form a projection screen; the projection screen includes a positioning focus item, and the positioning focus item is used to guide the subject to perform positioning;

[0013] Obtain the spatial position relationship between the X-ray emitting device and the X-ray receiving device detected by the position detection device, and when the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, adjust the projection focal length of the projection device so that the projection focus of the projection device falls on the planar component, and / or adjust the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection picture remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or so that the position and / or size of the positioning focus item in the projection picture relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component.

[0014] In one embodiment, the X-ray emitting device comprises:

[0015] The handpiece, which produces X-rays;

[0016] A beam limiter, wherein the projection device is arranged in the beam limiter, and the beam limiter also includes a reflection device, wherein:

[0017] The projection device is further used to generate visible light to form a visible light irradiation field area on the planar component;

[0018] The reflecting device is used to reflect the visible light generated by the projection device so that the visible light irradiation field area and the ray radiation field area formed by the X-rays generated by the head overlap on the plane component.

[0019] In one embodiment, the beam limiter further includes: a control unit; when the spatial positional relationship between the X-ray emitting device and the X-ray receiving device changes, the processor adjusts the projection focal length in the projection device so that the projection focus of the projection device falls on the planar component, and / or adjusts the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection image remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or so that the position and / or size of the positioning focus item in the projection image relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component, including:

[0020] The processor generates a first adjustment instruction when a spatial position relationship between the X-ray emitting device and the X-ray receiving device changes;

[0021] In response to the first adjustment instruction, the control unit adjusts the projection focal length in the projection device so that the projection focus of the projection device falls on the planar component, and / or adjusts the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection picture remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or so that the position and / or size of the positioning focus item in the projection picture relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component.

[0022] In one embodiment, the control unit adjusting the projection focal length of the projection device in response to the first adjustment instruction so that the projection focus of the projection device falls on the plane component includes:

[0023] The control unit obtains the projection image currently displayed on the plane component;

[0024] The control unit determines whether the clarity of the currently displayed projection image is consistent with a reference clarity; the reference clarity is the clarity of the projection image when the projection focus of the projection device falls on the plane component;

[0025] When it is determined that the clarity is inconsistent with the reference clarity, the control unit controls the adjustment of the projection focal length of the projection device so that the projection focus of the projection device falls on the plane component.

[0026] In one embodiment, the control unit adjusting the projection focal length of the projection device in response to the first adjustment instruction so that the projection focus of the projection device falls on the plane component includes:

[0027] The control unit acquires a current projection distance of the projection device, where the projection distance is the distance between the projection device and a planar component in the X-ray receiving device;

[0028] According to the current projection distance, the control unit controls the projection device to adjust the projection focal length so that the projection focus of the projection device falls on the plane component.

[0029] In one embodiment, the control unit adjusts the pixel information of the projected image in response to the first adjustment instruction so that the position and / or size of the positioning focus item in the projected image remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, and / or so that the position and / or size of the positioning focus item in the projected image relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component, including:

[0030] The control unit obtains a reference position and / or a reference size corresponding to the focus item in the projection image;

[0031] The control unit obtains the current position and parameter information of the projection device;

[0032] The control unit adjusts pixel information of the projected image based on the reference position and / or reference size corresponding to the positioning focus item and the current position and parameter information of the projection device, so that the position and / or size of the positioning focus item in the projection image remains unchanged from the reference position and / or reference size corresponding to the positioning focus item;

[0033] Alternatively, the control unit obtains a reference position and / or a reference size of the placement focus item in the projection image relative to the plane component;

[0034] The control unit obtains the current position and parameter information of the projection device;

[0035] The control unit adjusts the pixel information of the projected image based on the reference position and / or reference size of the positioning focus item relative to the planar component and the current position and parameter information of the projection device, so that the position and / or size of the positioning focus item relative to the planar component in the projection picture remains unchanged from the reference position and / or reference size of the positioning focus item relative to the planar component.

[0036] In one embodiment, when the spatial positional relationship between the X-ray emitting device and the X-ray receiving device changes, the processor adjusts the projection focal length of the projection device so that the projection focus of the projection device falls on the plane component, including:

[0037] The processor acquires a projection image currently displayed on the plane component when a spatial positional relationship between the X-ray emitting device and the X-ray receiving device changes;

[0038] The processor determines whether the clarity of the currently displayed projection image is consistent with a reference clarity; the reference clarity is the clarity of the projection image when the projection focus of the projection device falls on the plane component;

[0039] When it is determined that the clarity is inconsistent with the reference clarity, the processor controls the adjustment of the projection focal length of the projection device so that the projection focus of the projection device falls on the plane component.

[0040] In one embodiment, when the spatial positional relationship between the X-ray emitting device and the X-ray receiving device changes, the processor adjusts the projection focal length of the projection device so that the projection focus of the projection device falls on the plane component, including:

[0041] The processor acquires, when a spatial positional relationship between the X-ray emitting device and the X-ray receiving device changes, a current projection distance of the projection device, where the projection distance is a distance between the projection device and a planar component in the X-ray receiving device;

[0042] According to the current projection distance, the processor controls the projection device to adjust the projection focal length so that the projection focus of the projection device falls on the plane component.

[0043] In one embodiment, when the spatial positional relationship between the X-ray emitting device and the X-ray receiving device changes, the processor adjusts the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection image remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or so that the position and / or size of the positioning focus item in the projection image relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component, including:

[0044] The processor obtains a reference position and / or a reference size corresponding to the focus item in the projection image;

[0045] The processor obtains the current position and parameter information of the projection device;

[0046] The processor adjusts pixel information of the projected image based on a reference position and / or reference size corresponding to the positioning focus item and the current position and parameter information of the projection device, so that the position and / or size of the positioning focus item in the projection image remains unchanged from the reference position and / or reference size corresponding to the positioning focus item;

[0047] Alternatively, the processor obtains a reference position and / or a reference size of the placement focus item in the projection image relative to the plane component;

[0048] The processor obtains the current position and parameter information of the projection device;

[0049] The processor adjusts the pixel information of the projected image based on the reference position and / or reference size of the positioning focus item relative to the planar component and the current position and parameter information of the projection device, so that the position and / or size of the positioning focus item relative to the planar component in the projection image and the reference position and / or reference size of the positioning focus item relative to the planar component remain unchanged.

[0050] In one embodiment, it further includes: a camera device; the camera device is used to obtain the projection image currently displayed on the plane component.

[0051] In one embodiment, it further includes: a distance measuring device; the distance measuring device is used to obtain the current projection distance of the projection device.

[0052] In one embodiment, adjusting the pixel information of the projected image includes at least one or more of the following:

[0053] The projected image can be translated, the projected image can be scaled, the projected image can be rotated, and the projected image can be keystone corrected.

[0054] In one embodiment, the positioning concerns include at least one or more of the imaging surface area of ​​the detector, the detection field area of ​​the ionization chamber, the body position diagram of the subject, and the positioning requirements.

[0055] In one embodiment, the processor is further configured to:

[0056] When the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, the projection brightness of the projection device is adjusted so that the projection brightness matches the distance between the X-ray emitting device and the X-ray receiving device.

[0057] According to a second aspect, an embodiment provides a radioactive ray imaging device, comprising:

[0058] An X-ray emitting device, used for emitting radioactive rays toward the person being examined;

[0059] An X-ray receiving device includes a detector and a planar component arranged on the transmission path of the radioactive rays, wherein the detector is used to receive the radioactive rays that pass through the subject;

[0060] a projection device, disposed in the X-ray emitting device;

[0061] a position detection device, configured to detect a spatial positional relationship between the X-ray emitting device and the X-ray receiving device;

[0062] Processor for:

[0063] Controlling the projection device to project a projection image onto the planar component of the X-ray receiving device to form a projection screen; the projection screen includes a positioning focus item, and the positioning focus item is used to guide the subject to perform positioning;

[0064] Obtain the spatial position relationship between the X-ray emitting device and the X-ray receiving device detected by the position detection device, and when the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, adjust the projection brightness of the projection device so that the projection brightness matches the distance between the X-ray emitting device and the X-ray receiving device.

[0065] In one embodiment, the X-ray emitting device comprises:

[0066] The handpiece, which produces X-rays;

[0067] A beam limiter, wherein the projection device is arranged in the beam limiter, and the beam limiter also includes a reflection device, wherein:

[0068] The projection device is also used to generate visible light to form a visible light irradiation field area on the planar component;

[0069] The reflecting device is used to reflect the visible light generated by the projection device so that the visible light irradiation field area and the ray radiation field area formed by the X-rays generated by the head overlap on the plane component.

[0070] In one embodiment, the beam limiter further includes: a control unit; wherein the processor adjusts the projection brightness of the projection device when the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, so that the projection brightness matches the distance between the X-ray emitting device and the X-ray receiving device, including:

[0071] The processor generates a second adjustment instruction when a spatial position relationship between the X-ray emitting device and the X-ray receiving device changes;

[0072] The control unit adjusts the projection brightness of the projection device in response to the second adjustment instruction so that the projection brightness matches the distance between the X-ray emitting device and the X-ray receiving device.

[0073] According to a third aspect, an embodiment provides a method for radioactive ray imaging, wherein the apparatus for radioactive ray imaging includes an X-ray emitting device and an X-ray receiving device, wherein the X-ray emitting device is provided with a projection device, and the method includes:

[0074] Controlling the projection device to project a projection image onto the planar component of the X-ray receiving device to form a projection screen; the projection screen includes a positioning focus item, and the positioning focus item is used to guide the subject to perform positioning;

[0075] When a change in the spatial position relationship between the X-ray emitting device and the X-ray receiving device is detected, the projection focal length in the projection device is adjusted so that the projection focus of the projection device falls on the planar component, and / or the pixel information of the projected image is adjusted so that the position and / or size of the positioning focus item in the projection screen remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or the position and / or size of the positioning focus item in the projection screen relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component.

[0076] According to a fourth aspect, an embodiment provides a method for radioactive ray imaging, which is applied to a device for radioactive ray imaging, including an X-ray emitting device and an X-ray receiving device, wherein the X-ray emitting device is provided with a projection device, and is characterized in that the method includes:

[0077] Controlling the projection device to project a projection image onto the planar component of the X-ray receiving device to form a projection screen; the projection screen includes a positioning focus item, and the positioning focus item is used to guide the subject to perform positioning;

[0078] Obtain the spatial position relationship between the X-ray emitting device and the X-ray receiving device detected by the position detection device, and when the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, adjust the projection brightness of the projection device so that the projection brightness matches the distance between the X-ray emitting device and the X-ray receiving device.

[0079] According to the radioactive ray imaging method and apparatus of the above-mentioned embodiment, a projection device is provided in the X-ray emitting device, and a projection image including the positioning focus item is projected onto the planar component of the X-ray receiving device by the projection device to form a projection screen, so as to guide the subject to quickly and accurately position. Moreover, when the spatial positional relationship between the X-ray emitting device and the X-ray receiving device changes, the projection focal length of the projection device and / or the pixel information of the positioning focus item in the projected image can be adaptively adjusted, so that the clarity of the projection screen, the position and / or size of the positioning focus item in the projection screen, and the position and / or size of the positioning focus item in the projection screen relative to the planar component are not affected by the change in the spatial positional relationship between the X-ray emitting device and the X-ray receiving device.

[0080] In addition, when the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, the projection brightness of the projection device can also be adaptively adjusted to match the projection brightness with the distance between the X-ray emitting device and the X-ray receiving device, so that the projection brightness is not affected by changes in the position relationship between the X-ray emitting device and the X-ray receiving device. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Figure 1 A schematic structural diagram of a radioactive ray imaging device according to an embodiment;

[0082] Figure 2 Schematic diagram of the structure of an X-ray emitting device according to an embodiment;

[0083] Figure 3 This is a schematic structural diagram of a machine head according to an embodiment;

[0084] Figure 4 Schematic diagram of the structure of an X-ray emitting device according to an embodiment;

[0085] Figure 5 Schematic diagram of the structure of an X-ray emitting device according to an embodiment;

[0086] Figure 6 This is a schematic structural diagram of an X-ray receiving device according to an embodiment;

[0087] Figure 7 A schematic structural diagram of a detector according to an embodiment;

[0088] Figure 8 A schematic structural diagram of a radioactive ray imaging device according to an embodiment;

[0089] Figure 9 A schematic structural diagram of a radioactive ray imaging device according to an embodiment;

[0090] Figure 10 A schematic structural diagram of a radioactive ray imaging device according to an embodiment;

[0091] Figure 11 A schematic structural diagram of a radioactive ray imaging device according to an embodiment;

[0092] Figure 12 A flowchart of a method for radioactive ray imaging according to an embodiment;

[0093] Figure 13 A flowchart of a method for adjusting the projection focal length in a projection device according to an embodiment;

[0094] Figure 14 A flowchart of a method for adjusting the projection focal length in a projection device according to an embodiment;

[0095] Figure 15 Schematic diagram of the relationship between projection distance and the number of motor steps of a focus motor according to an embodiment;

[0096] Figure 16A flowchart of a method for adjusting pixel information of a projected image according to an embodiment;

[0097] Figure 17 A schematic diagram of the positional relationship between a focus item and a projection device in a projection image according to an embodiment;

[0098] Figure 18 A flowchart of a method for adjusting pixel information of a projected image according to an embodiment;

[0099] Figure 19 A flowchart of a method for radioactive ray imaging according to an embodiment;

[0100] Figure 20 Schematic diagram of the structure of a beam limiter according to an embodiment;

[0101] Figure 21 Schematic diagram of the structure of a beam limiter according to an embodiment;

[0102] Figure 22 A flowchart of a method for radioactive ray imaging according to an embodiment of the present invention is provided. DETAILED DESCRIPTION

[0103] The present invention will be further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions, and for those skilled in the art, it is not necessary to describe these related operations in detail. They will fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0104] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0105] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0106] Please refer to Figure 1 In some embodiments, a radioactive ray imaging device is provided. The device includes an X-ray emitting device 10, an X-ray receiving device 20, and a processor 30. The X-ray emitting device 10 is configured to emit radioactive rays, such as X-rays, toward a subject. The X-ray receiving device 20 is configured to receive the radioactive rays that have passed through the subject to perform imaging. This is described in detail below.

[0107] In some embodiments, please refer to Figure 2 , the X-ray emitting device 10 may include a head 11 and a beam limiter 12. Figure 3 The head 11 further includes a high-voltage generator 101 and a radiation emitter 102. The high-voltage generator 101 is electrically connected to the radiation emitter 102 and is used to provide a high-voltage signal, such as a high voltage of the hundred-volt or thousand-volt level, to the radiation emitter 102. The radiation emitter 102 is used to bombard the target surface with electrons under the high-voltage signal to generate radioactive radiation, such as X-rays. The radiation emitter 102 can be, for example, a tube. The X-ray receiving device 20 is used to receive the radioactive radiation for imaging. The beam limiter 12 is used to determine or simulate the projection area of ​​the X-ray emitting device 10 or the radiation emitter 102. The area irradiated by the beam limiter 12 can be referred to as the visible light irradiation field area or the visible light irradiation field area. In addition, the X-ray emitting device 10 is used to emit radioactive radiation, and the X-ray receiving device 20 is used to receive radioactive radiation. During this process, the beam limiter 12 can also be used to limit the radiation field of the radioactive radiation emitted by the radiation emitter 102. Therefore, in some examples, the beam limiter 12 can also serve to confine the radioactive radiation and shield scattered radioactive radiation.

[0108] In some embodiments, please refer to Figure 4 The radioactive ray imaging device may further include a projection device 13, which is disposed within the beam limiter 12 and is configured to project an image under the control of the processor 30. Furthermore, the projection device 13 is configured to generate visible light to form a visible light irradiation field. The beam limiter 12 also includes a reflection device 14, which is configured to reflect the visible light generated by the projection device 13 so that it coincides with the X-rays emitted by the ray emitter 102 along the optical path, thereby aligning the resulting visible light irradiation field with the resulting X-ray radiation field.

[0109] In some embodiments, please refer to Figure 5 The beam limiter 12 may further include a control unit 15, which may also control the projection device 13 to project the projection image. In one example, the control unit 15 is further connected to the processor 30 for information exchange.

[0110] The X-ray receiving device 20 is a core component of the radioactive ray imaging device and has an important impact on the imaging quality. In some embodiments, the X-ray receiving device 20 is used to receive radioactive rays such as X-rays and ultimately convert them into electrical signals to complete image information acquisition. Figure 6 In one embodiment, the X-ray receiving device 20 includes a detector 21 and a planar component 22 disposed on the transmission path of the radioactive ray. Figure 7 The detector 21 further includes a ray conversion layer 201 and a TFT matrix layer 202. The ray conversion layer 201 is used to convert radioactive rays, such as X-rays, into visible light; the ray conversion layer 201 generally includes a scintillating layer or a fluorescent layer for converting the rays into visible light. Taking the scintillating layer as an example, it can generally be made of a scintillating material, typically, such as cesium iodide (CsI) or gadolinium oxysulfide (GOS). The TFT matrix layer 202 is used to sense the visible light converted by the ray conversion layer 201 and convert the visible light into an electrical signal for image information acquisition. In some embodiments, the detector 21 can be a flat-panel detector. In some embodiments, the plane component 22 is used to display the projection screen formed by the projection device 13 projecting the projection image. For radioactive ray imaging devices of different structures, the plane component 22 can be different components. For example, for a vertical device, the plane component 22 is a vertical film cassette that houses the detector 21. The projection device 13 projects the projection image onto the side of the vertical film cassette opposite the X-ray emission device 10 to form the projection screen. For another example, for a horizontal device, the plane component is a bed board used to support the patient. The detector 21 is located on the lower side of the bed board. The projection device 13 projects the projection image onto the side of the bed board opposite the X-ray emission device 10 (i.e., the upper side of the bed board) to form the projection screen. It should be noted that in radioactive ray imaging devices, the detector 21 will track the movement of the head 11 to ensure that the detector 21 can receive the X-rays emitted by the head 11. The projection device 13 will also move with the head 11. Therefore, ideally, the area of ​​the projection screen displayed on the plane component 22 should spatially overlap with the imaging surface area of ​​the detector 21.

[0111] In some embodiments, please refer to Figure 8 The radioactive ray imaging device may further include an imaging device 40, or the radioactive ray imaging device may further be connected to an imaging device 40. The imaging device 40 may be capable of capturing images, such as real-time images. In one example, when the projection device 13 projects an image onto the planar component 22 in the X-ray receiving device 20 to form a projection screen, the imaging device 40 may capture an image corresponding to the projection screen displayed on the planar component 22.

[0112] In some embodiments, please refer to Figure 9 The radioactive ray imaging device also includes a position detection device 50, such as a position sensor 51. There can be multiple position sensors 51. In one embodiment, the position sensors 51 are distributed at various components in the radioactive ray imaging device to detect the real-time position of each component in the radioactive ray imaging device. In another embodiment, the position sensors 51 are distributed at different positions of a component in the radioactive ray imaging device to detect the shape and size of the component. For example, four position sensors 51 are respectively set at the four corners of the detector to detect the shape and size of the detector. In other embodiments, the radioactive ray imaging device may also include a distance measuring device 52. The distance measuring device 52 is used to measure the distance between various components in the device. For example, the distance measuring device 52 is set on the beam limiter 12 (projection device 13) to measure the distance between the projection device 13 and the plane component 22 in the X-ray receiving device 20 to obtain the projection distance of the projection device 13.

[0113] Figure 10 This is an example of a horizontal radioactive ray imaging device. In the figure, the support structure of the X-ray emitting device 10 may include a slide rail 111, a telescopic cylinder 112 and a first cross arm 113. The head 11 is connected to one end of the telescopic tube 112 through the first cross arm 113, and the other end of the telescopic tube 112 is connected to the slide rail 111. The head 11 can move in two or three dimensions in space through the slide rail 111 and the telescopic cylinder 112. In one embodiment, the beam limiter 12 is arranged at the position of the radioactive ray outlet of the head 11. The device may also include a bed board 211 and a bed support structure 212 for supporting the bed board 211; the bed board 211 can be used to support the subject, for example, for the subject to lie flat. The detector 21 is arranged in the under-bed film box 213, and the under-bed film box 213 is arranged below the bed board 211; in one embodiment, the bed board 211 is usually placed below the head 11, and the head 11 emits X-rays toward the bed board 211. The emitted X-rays are limited by the beam limiter 12 and then emitted to the detector 21 contained in the under-bed film box 213 below the bed board 211 to receive the X-rays.

[0114] Figure 11This is an example of a vertical radioactive ray imaging device. In the figure, the support structure of the X-ray emitting device 10 is the same as that of the horizontal device and will not be described in detail here. The device may also include a column 214 and a column cassette 215 disposed on the column 214. The column cassette 215 and the column 214 are connected by a second cross arm 216. The column cassette 215 is used to accommodate the detector 21. The column cassette 215 can be raised and lowered along the column 214 via the second cross arm 216. When the device is working, the person being tested stands in front of the column cassette 215, and the head 11 emits X-rays in the direction of the column cassette 215. The emitted X-rays are limited by the beam limiter 12 and then pass through the person being tested to the detector 21 in the column cassette 215 to receive the X-rays.

[0115] In some embodiments, the radioactive ray imaging device may be a digital X-ray imaging device (Digital Radiography, DR).

[0116] The above are some descriptions of radioactive ray imaging equipment.

[0117] In some embodiments, the processor 30 is capable of executing the method of radiographic imaging disclosed herein or one or more steps thereof.

[0118] Please refer to Figure 12 The method of radiographic imaging may include the following steps:

[0119] Step S100: Control the projection device 13 to project the projection image onto the plane component 22 of the X-ray receiving device 20 to form a projection screen. The projection screen includes positioning focus items, which are used to guide the subject to perform positioning.

[0120] In some embodiments, the processor 30 may generate image data (e.g., HDMI data) corresponding to the projected image based on the determined content required to be included in the projection screen formed after the projection device 13 projects the projection image, the positional relationship between the projection device 13 and the planar component 22 detected by the position detection device 50, and parameter information of the projection device 13. That is, the processor 30 acquiring the projection image may generate image data corresponding to the projection image for the processor 30. The content required to be included in the projection screen may be a positioning focus item required to be displayed in the projection screen, which may be determined based on the user inputting relevant instructions through the input device of the device to determine the positioning focus item required to be displayed in the projection screen.

[0121] In other embodiments, the processor 30 may also first generate image data corresponding to the corresponding projection image based on the determined content required to be included in the projection screen, the positional relationship between the projection device 13 and the plane component 22, and the parameter information of the projection device 13, and then the processor 30 outputs the image data to the projection device 13. After the projection device 13 performs some display processing on the image data, the final projection image can be obtained. That is, the processor 30 obtains the projection image, which can enable the processor 30 to obtain the projection image generated by the projection device 13.

[0122] In some further embodiments, the projection image acquired by the processor 30 may also be image data generated by other control processing components and then directly transmitted, which is not limited in this embodiment.

[0123] The inventors conducted research on clinical positioning-related issues and proposed positioning focus items, which are used to assist technicians in positioning the subject.

[0124] In some embodiments, the positioning concerns may include: one or more of: the imaging surface area of ​​the detector 21, the detection field area of ​​the ionization chamber, the body position diagram of the subject, the center line of the light field, and the positioning requirements.

[0125] The following describes each of the positioning concerns.

[0126] The imaging surface area of ​​the detector 21 refers to the area where the detector 20 can receive and sense radiation.

[0127] The detection field of an ionization chamber refers to the area within the chamber that can receive and sense radiation. In some embodiments, radioactive radiation imaging equipment may include multiple ionization chambers. These chambers are typically located within the detector and are used to estimate radiation dose during the imaging process, enabling the processor 30 or X-ray emission device 10 to determine when to receive and transmit radiation, thereby controlling exposure cutoff. The ionization chamber can be turned on or off; when turned on, the detector area within the ionization chamber is also turned on or enabled.

[0128] The subject's body position map refers to the subject's appearance and shooting position in the projected image.

[0129] The center line of the light field refers to the cross line where the center point of the projected image is located.

[0130] Positioning requirements refer to the posture of the subject to be photographed. This can be marked in the projected image using a combination of text and graphics.

[0131] Taking the chest posterior-anterior position as an example, the positioning requirements for this position include the subject placing the backs of their hands on their hips or hugging the imaging surface, bending their elbows as far forward as possible, and turning their shoulders inward and keeping them flat.

[0132] Taking the lateral knee joint position as an example, the position requirement for this position includes the subject's knee flexion 120 to 130 degrees.

[0133] In some embodiments, the planar assembly of the X-ray receiving device 20 comprises a housing or support structure. In one embodiment, for a vertical radioactive ray imaging device, the planar assembly 22 may be a column cassette 215, with the detector 21 housed within the column cassette 215. In another embodiment, for a horizontal radioactive ray imaging device, the planar assembly 22 may be a bed 211, with the detector 21 housed within an under-bed cassette 213 disposed beneath the bed 211.

[0134] After the projection device 13 projects the above-mentioned projection image containing the positioning focus items onto the plane component 22 to form a projection screen, the technician or the person being examined can intuitively see the relevant information of the positioning through the positioning focus items in the projection screen, and the positioning focus items displayed in the projection screen can also provide objective evaluation metrics without relying on the experience of the radiological technician, so as to guide the person being examined to perform positioning quickly and accurately.

[0135] Step S200: Obtain the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 detected by the position detection device 50, and when the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, adjust the projection focal length of the projection device 13 so that the projection focus of the projection device 13 falls on the plane component, and / or adjust the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection picture remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or so that the position and / or size of the positioning focus item in the projection picture relative to the plane component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the plane component.

[0136] In some embodiments, a position sensor 51 in a radioactive ray imaging device can be used to detect the positions of the X-ray emitting device 10 and the X-ray receiving device 20, respectively, to obtain the spatial positional relationship between the X-ray emitting device 10 and the X-ray receiving device 20. In one embodiment, the position of the X-ray emitting device 10 can be the position of the handpiece 11 or the beam limiter 12; the position of the X-ray receiving device 20 can be the position of the planar assembly 22 (the column cassette 215 or the bed plate 211). The projection distance of the projection device 13 is actually the distance between the light source emitting visible light in the projection device 13 and the plane component 22 in the X-ray receiving device 20. Since the projection device 13 is arranged in the beam limiter 12, and the beam limiter 12 is connected to the head 11, when at least one of the position of the head 11 or the beam limiter 12 and the position of the plane component 22 (the column film box 215 or the bed board 211) changes, the clarity of the projection image displayed on the plane component 22 and one or more of the position and size of the positioning focus items may change accordingly. The following takes the change in the spatial position relationship between the head 11 and the plane component 22 as an example to explain in detail the impact on the projection image.

[0137] (1) If the relative position between the machine head 11 and the plane component 22 remains unchanged but the distance between them changes, the projection distance of the projection device 13 will change accordingly. On the one hand, after the projection distance changes, the previous projection focal length of the projection device 13 will not be able to satisfy the requirement that the projection focus falls exactly on the plane component 22, thereby causing the clarity of the projection image formed on the plane component 22 to deteriorate. On the other hand, after the projection distance changes, the size of the positioning focus item in the projection image will change. For example, before the distance between the machine head 11 and the plane component 22 changes, the size of the positioning focus item in the projection image is 20×20 pixels. Then, after the distance between the machine head 11 and the plane component 22 increases, the size of the positioning focus item in the projection image may become 10×10 pixels.

[0138] (2) If the distance between the machine head 11 and the planar assembly 22 remains unchanged but their relative positions change, the position of the focus item in the projection image will also change accordingly. For example, for a horizontal device, if the machine head 11 moves horizontally to the left while maintaining its height, the position of the focus item in the projection image will also move to the left, causing the position of the focus item to deviate.

[0139] (3) If the distance and relative position between the machine head 11 and the plane component 22 change, the clarity of the projection image, and the position and size of the focus items in the projection image will also change.

[0140] Therefore, after the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, it is necessary to adjust one or more of the clarity of the projection image, the position and size of the positioning focus item in the projection image, and the adjustment can be completed through the processor 30 or the control unit, which is described in detail below.

[0141] In some embodiments, please refer to Figure 13 Step S200: When the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, the processor 30 adjusts the projection focal length of the projection device 13 so that the projection focus of the projection device falls on the plane component, including the following steps:

[0142] Step S211-1: When the spatial positional relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, the processor 30 obtains the projection image currently displayed on the planar assembly 22. In some embodiments, the projection image displayed on the planar assembly 22 can be captured by the imaging device 40 and the captured projection image can be transmitted to the processor 30. The imaging device 40 can be inside or outside the beam limiter 12, which is not limited in this embodiment.

[0143] Step S212-1: Processor 30 determines whether the clarity of the currently displayed projected image is consistent with the reference clarity. Since the image clarity at the projection focus is highest during projection imaging, in this embodiment, the reference clarity is the corresponding clarity of the projected image when the projection focus of projection device 13 falls on plane component 22.

[0144] Step S213 - 1 : When it is determined that the resolution is inconsistent with the reference resolution, the processor 30 controls the adjustment of the projection focal length of the projection device 13 so that the projection focus of the projection device 13 falls on the plane component 22 .

[0145] When adjusting the projection focal length based on the clarity of the projection image, in some embodiments, when the current clarity and the reference clarity are inconsistent, the focus can be adjusted according to preset rules. For example, the projection focal length can be first increased according to preset intervals. Each time the projection focal length is adjusted, the camera device 40 is controlled to capture the projection image once, and the clarity of the projection image is obtained through the processor 30. If the projection image is gradually becoming clearer, the focus is adjusted in this direction until the clarity of the projection image is consistent with the reference clarity. Conversely, if the projection image is gradually becoming less clear, the focus is adjusted in the opposite direction until the clarity of the projection image is consistent with the reference clarity.

[0146] In other embodiments, please refer to Figure 14Step S300: When the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, the processor 30 adjusts the projection focal length of the projection device 13 so that the projection focus of the projection device falls on the plane component, including the following steps:

[0147] Step S211-2: When the spatial positional relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, the processor 30 obtains the current projection distance of the projection device 13. The projection distance of the projection device 13 is the distance between the projection device 13 and the planar assembly 22 of the X-ray receiving device 20. In one embodiment, the positions of the projection device 13 and the planar assembly 22 can be detected by a position sensor 51 to obtain the current projection distance of the projection device 13. In another embodiment, the current projection distance of the projection device 13 can also be detected by a distance measuring device 52 provided on the beam limiter 12.

[0148] Step S212-2: Based on the current projection distance, the processor 30 controls the projection device 13 to adjust the projection focal length so that the projection focus of the projection device 13 falls on the plane component 22. Different projection devices 13 have different specific relationships between the projection distance and the projection focal length. For example, the projection distance and the projection focal length may be in an inversely proportional relationship.

[0149] When adjusting the projection focal length based on the projection distance, in one embodiment, the current projection distance of the projection device 13 can be obtained via the position sensor 51 or the distance measuring device 52. Based on the specific relationship between the projection distance and the projection focal length, the projection focal length can be adjusted according to the current projection distance. For example, if the current projection distance is greater than the previous projection distance, the projection focal length is adjusted downward; if the current projection distance is less than the previous projection distance, the projection focal length is adjusted upward.

[0150] In some embodiments, the focus of the projection device 13 can be adjusted by a focus motor. When the current clarity of the projected image is inconsistent with the reference clarity or the projection distance changes, the processor 30 outputs a corresponding drive signal to the focus motor to make the motor of the focus motor execute a corresponding number of steps, thereby adjusting the projection distance. Figure 15 The projection distance and the number of steps of the focus motor change in a certain proportional relationship. The focus motor can be a focus motor embedded in the projection device or a focus motor separately provided beside the projection device 13.

[0151] Since the positioning concerns in the projection screen can include two major categories of content, one category is positioning concerns with physical objects, such as the imaging surface area of ​​the detector and the detection field area of ​​the ionization chamber. The other category is positioning concerns without physical objects, such as the body position diagram of the person being tested, the center line of the light field, and positioning requirements. For positioning concerns with physical objects, it is necessary to ensure that the position and size of the positioning concerns in the projection screen are the same as the position and size of the corresponding physical objects. For example, the imaging surface area of ​​the detector in the projection screen needs to be the same as the position and size of the actual imaging surface area of ​​the detector, and the detection field area of ​​the ionization chamber in the projection screen needs to be the same as the position and size of the actual detection field of the ionization chamber. Therefore, for this type of positioning concerns with physical objects, its reference position is the position of the corresponding physical object, and the reference size is the size of the corresponding physical object. For positioning concerns that do not represent physical objects, it is necessary to ensure that the position and size of the positioning concerns in the projection image relative to the planar component 22 maintain a fixed, optimal proportional relationship. Therefore, for these positioning concerns that do not represent physical objects, in one embodiment, after the device is powered on, a technician can adjust the positioning concerns in the projection image based on experience to obtain an optimal projection image. The position of the positioning concern relative to the planar component 22 in this optimal display image serves as its reference position relative to the planar component 22. Similarly, the size of the positioning concern relative to the planar component 22 in this optimal display image serves as its reference size relative to the planar component 22. In another embodiment, after the device is powered on, the processor 30 can automatically display an optimal projection image based on the positional relationships of the various components. The position of the positioning concern relative to the planar component 22 in this optimal display image serves as its reference position relative to the planar component 22. Similarly, the size of the positioning concern relative to the planar component 22 in this optimal display image serves as its reference size relative to the planar component 22.

[0152] In some embodiments, for the placement of physical objects, please refer to Figure 16 Step S300: When the spatial positional relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, the processor 30 adjusts the pixel information of the projected image so that the position and / or size of the positioning focus item in the projected image remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, including the following steps:

[0153] Step S221-1: Processor 30 obtains a reference position and / or reference size corresponding to a positioning focus item in the projection image. Taking the positioning focus item as the imaging surface area of ​​detector 21 as an example, the reference position of the imaging surface area of ​​detector 21 can be obtained by detecting and calculating using position sensors 51 disposed near detector 21. The reference size of the imaging surface area of ​​detector 21 can be obtained by detecting and calculating using position sensors 51 disposed at the four corners of the imaging surface of detector 21. Furthermore, the reference position and reference size of the imaging surface area of ​​detector 21 can also be obtained based on empirical data or user input.

[0154] Step S222-1: The processor 30 obtains the current position and parameter information of the projection device 13.

[0155] In some embodiments, since the projection device 13 is set in the beam limiter 12, the current position of the projection device 13 can be obtained by detecting the current position of the beam limiter 12 through the position sensor 51, or a position sensor 51 can be set at the projection device 13 to detect its current position.

[0156] In some embodiments, the parameter information of the projection device 13 may include information such as the projection focal length of the projection device 13 .

[0157] Step S223-1: The processor 30 adjusts the pixel information of the projected image according to the reference position and / or reference size corresponding to the positioning focus item and the current position and parameter information of the projection device, so that the position and / or size of the positioning focus item in the projection image remains unchanged from the reference position and / or reference size corresponding to the positioning focus item.

[0158] Please refer to Figure 17 In one embodiment, a coordinate system (x, y, z) is established using a point P on the plane corresponding to the projection screen A displayed in the plane component 22. In this coordinate system, the coordinates corresponding to the reference position of the positioning focus item B are (x1, y1, z1), and the coordinates corresponding to the current position of the projection device 13 are (x2, y2, z2). According to the reference position corresponding to the positioning focus item and the current position of the projection device 13, the spatial position relationship between the positioning focus item and the projection device 13 can be obtained. Then, the reference size of the positioning focus item is obtained, that is, the shape data of the positioning focus item is obtained. Finally, according to the parameter information of the projection device 13, the reference size of the positioning focus item and the spatial position relationship between the positioning focus item and the projection device 13, the pixel information that should be displayed for each pixel point in the projected image is comprehensively calculated, so that the position of the positioning focus item in the projection screen is the same as the reference position, and the size of the positioning focus item in the projection screen is the same as the reference size. Finally, the positioning focus item in the projection screen is consistent in size and position with the corresponding physical object.

[0159] In some embodiments, for positioning items without physical objects, please refer to Figure 18 Step S300: When the spatial positional relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, the processor 30 adjusts the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection image relative to the plane component 22 remains unchanged with the reference position and / or reference size of the positioning focus item relative to the plane component 22, including the following steps:

[0160] Step S221-2: Processor 30 obtains a reference position and / or reference size of the positioning focus item in the projection image relative to planar component 22. Taking the positioning focus item as the light field centerline as an example, the reference position of the center point of the light field centerline relative to planar component 22 is the center point position of the projection image displayed on planar component 22, and the lengths of the two crosshairs of the light field centerline relative to the reference size of planar component 22 are . The ratio of the two crosshairs of the light field centerline to the corresponding side lengths of planar component 22 is N:1.

[0161] Step S222-2: The processor 30 obtains the current position and parameter information of the projection device 13. The method of obtaining the current position and parameter information of the projection device 13 has been described in the above embodiment and will not be repeated here.

[0162] Step S223-3: The processor 30 adjusts the pixel information of the projected image according to the reference position and / or reference size of the positioning focus item relative to the planar component 22 and the current position and parameter information of the projection device, so that the position and / or size of the positioning focus item relative to the planar component 22 in the projection picture remains unchanged from the reference position and / or reference size of the positioning focus item relative to the planar component 22.

[0163] In some embodiments, there may be only movement in the x and y directions between the X-ray emitting device 10 (head 11) and the X-ray receiving device 20 (planar component 22), that is, the distance between the head 11 and the planar component 22 does not change, but the relative position changes. In this case, the pixel information that should be displayed at each pixel point in the projected image can be adjusted by the image translation algorithm; in other embodiments, there may be only movement in the z direction between the X-ray emitting device 10 (head 11) and the X-ray receiving device 20 (planar component 22), that is, the distance between the head 11 and the planar component 22 changes, but the relative position remains unchanged. In this case, the pixel information that should be displayed at each pixel point in the projected image can be adjusted by the image scaling algorithm; in still other embodiments, there may be movement in all of the x, y, and z directions between the X-ray emitting device 10 (head 11) and the X-ray receiving device 20 (planar component 22), that is, the distance between the head 11 and the planar component 22 changes, and the relative position also changes. In this case, the pixel information that should be displayed at each pixel point in the projected image can be adjusted by the image scaling algorithm and the translation algorithm. In some other embodiments, the X-ray emitting device 10 (head 11) may have some angular offset, which may cause the projected image, which should be rectangular, to be distorted into a trapezoid. In this case, it is necessary to use trapezoidal correction of the projected image to adjust the projected image so that the projected image is corrected to a trapezoid. In some embodiments, the film box containing the detector 21 in some devices has the function of following the head 11. That is, for some devices with a film box following function, only the z-direction movement will occur, while the x- and y-directions will not move. For such devices, when adjusting the pixel information of the projected image, only image scaling processing is required. In addition, in some embodiments, the head 11 can rotate about the z-axis, so that the projected image will rotate on the plane component 22. Therefore, after the X-ray emitting device 10 (head 11) is rotated relative to the X-ray receiving device 20 (plane component 22), the pixel information that should be displayed for each pixel point in the projected image can be adjusted by rotating the image.

[0164] The above is some explanation of adjusting one or more of the clarity of the projection image, the position and size of the positioning focus item in the projection image through the processor 30 after the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes.

[0165] In some embodiments, after the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, the control unit 15 can adjust one or more of the clarity of the projection image, the position and size of the positioning focus item in the projection image, which is described in detail below.

[0166] In some embodiments, please refer to Figure 19Step S300: When the spatial positional relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, the processor 30 adjusts the projection focal length of the projection device 13 so that the projection focus of the projection device 13 falls on the plane component 22, and / or adjusts the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection image remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or the position and / or size of the positioning focus item in the projection image relative to the plane component 22 remains unchanged with the reference position and / or reference size of the positioning focus item relative to the plane component 22. The method includes the following steps:

[0167] Step S231: The processor 30 generates a first adjustment instruction when the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes. The processor 30 may determine a change in the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 by referring to the description of the above embodiment.

[0168] Step S232: The control unit 15 adjusts the projection focal length in the projection device 13 in response to the first adjustment instruction so that the projection focus of the projection device 13 falls on the plane component 22, and / or adjusts the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection picture remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or so that the position and / or size of the positioning focus item in the projection picture relative to the plane component 22 remains unchanged with the reference position and / or reference size of the positioning focus item relative to the plane component 22.

[0169] In some embodiments, in step S232, the control unit 15 adjusts the projection focal length of the projection device 13 in response to the first adjustment instruction so that the projection focus of the projection device 13 falls on the plane component 22, including:

[0170] Step S2321 - 1 : The control unit 15 obtains the projection image currently displayed on the plane component.

[0171] Step S2322-1: The control unit 15 determines whether the clarity of the currently displayed projected image is consistent with the reference clarity. Since the image clarity at the projection focus is highest during projection imaging, in this embodiment, the reference clarity is the corresponding clarity of the projected image when the projection focus of the projection device 13 falls on the plane component 22.

[0172] Step S2323 - 1 : When it is determined that the definition is inconsistent with the reference definition, the control unit 15 controls the adjustment of the projection focal length of the projection device 13 so that the projection focus of the projection device 13 falls on the plane component 22 .

[0173] Please refer to Figure 20In some embodiments, the camera device 40 is disposed within the beam limiter 12, which also includes a control unit 15. The camera device 40 is configured to capture the projection image displayed on the plane assembly 22 and transmit the captured projection image to the control unit 15. In other embodiments, the camera device 40 may also be disposed outside the beam limiter 12. For example, the camera device 40 may be disposed on the first crossbeam 113 of the support structure of the device.

[0174] The control unit 15 adjusts the projection focal length based on the clarity of the projection image in the same manner as the processor 30 , and reference may be made to the above description.

[0175] In some other embodiments, in step S232, the control unit 15 adjusts the projection focal length of the projection device 13 in response to the first adjustment instruction so that the projection focus of the projection device 13 falls on the plane component 22, including:

[0176] Step S2321 - 2 : The control unit 15 obtains the current projection distance of the projection device 13 , where the projection distance is the distance between the projection device 13 and the planar component 22 in the X-ray receiving device 20 .

[0177] Step S2322 - 2 : Based on the current projection distance, the control unit 15 controls the projection device 13 to adjust the projection focal length so that the projection focus of the projection device 13 falls on the plane component 22 .

[0178] Please refer to Figure 21 In some embodiments, the distance measuring device 52 is disposed within the beam limiter 12, which further includes a control unit 15. The distance measuring device 52 is configured to measure the distance (projection distance) between the projection device 13 and the planar assembly 22 and transmit the measured distance to the control unit 15. In other embodiments, a position sensor 51 may be used to detect the distance between the projection device 13 and the planar assembly 22, or the distance measuring device 52 may be disposed outside the beam limiter 12, which is not limited in this embodiment.

[0179] The control unit 15 adjusts the projection focal length based on the projection distance of the projection device 13 in the same manner as the processor 30 , and reference may be made to the above description.

[0180] In some embodiments, for a positioning focus item having a physical object, the control unit 15 in S232 adjusts pixel information of the projected image in response to the first adjustment instruction so that the position and / or size of the positioning focus item in the projected image remains unchanged from the reference position and / or reference size corresponding to the positioning focus item, including:

[0181] Step S2321-3: The control unit 15 obtains a reference position and / or a reference size corresponding to the placement focus item in the projection image.

[0182] Step S2322 - 3 : The control unit 15 obtains the current position and parameter information of the projection device 13 .

[0183] Step S2323-3: The control unit 15 adjusts the pixel information of the projected image according to the reference position and / or reference size corresponding to the positioning focus item and the current position and parameter information of the projection device 13, so that the position and / or size of the positioning focus item in the projection picture remains unchanged from the reference position and / or reference size corresponding to the positioning focus item.

[0184] In some other embodiments, for a positioning focus item that does not have a physical object, in step S232, the control unit 15 adjusts the pixel information of the projected image in response to the first adjustment instruction so that the position and / or size of the positioning focus item in the projected image relative to the planar component 22 remains unchanged from the reference position and / or reference size of the positioning focus item relative to the planar component 22, including:

[0185] Step S2321 - 4 : The control unit 15 obtains a reference position and / or a reference size of the positioning focus item in the projection image relative to the plane component 22 .

[0186] Step S2322 - 4 : the control unit 15 obtains the current position and parameter information of the projection device 13 .

[0187] Step S2323-4: The control unit 15 adjusts the pixel information of the projected image based on the reference position and / or reference size of the positioning focus item relative to the planar component, and the current position and parameter information of the projection device 13, so that the position and / or size of the positioning focus item relative to the planar component 22 in the projection picture and the reference position and / or reference size of the positioning focus item relative to the planar component 22 remain unchanged.

[0188] It should be noted that the above-mentioned method of adjusting the pixel information of the projection image by the control unit 15 can refer to the description of adjusting the pixel information of the projection image by the processor 30, and will not be repeated here.

[0189] For some examples, please refer to Figure 22 , also provides a method for radiographic imaging, comprising the following steps:

[0190] Step S10: The processor 30 controls the projection device 13 to project the projection image onto the planar component of the X-ray receiving device 20 to form a projection screen. The projection screen includes positioning focus items, which are used to guide the subject in positioning.

[0191] Step S20: The processor 30 obtains the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 detected by the position detection device, and adjusts the projection brightness of the projection device 13 when the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, so that the projection brightness matches the distance between the X-ray emitting device 10 and the X-ray receiving device 20.

[0192] When the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, the brightness of the projection screen formed by the projection device 13 on the plane component 22 will also change accordingly. For example, if the distance between the X-ray emitting device 10 and the X-ray receiving device 20 increases, that is, the projection distance of the projection device 13 increases, the brightness of the projection screen will become weaker. If the brightness of the projection screen is weak, it will also have some impact on viewing. Therefore, when the distance between the X-ray emitting device 10 and the X-ray receiving device 20 changes, it is necessary to adjust the projection brightness of the projection device 13 so that the projection brightness of the projection device 13 matches the distance between the X-ray emitting device 10 and the X-ray receiving device 20. That is, when the distance between the X-ray emitting device 10 and the X-ray receiving device 20 tends to increase, the projection brightness of the projection device 13 needs to be increased. Conversely, when the distance between the X-ray emitting device 10 and the X-ray receiving device 20 tends to decrease, the projection brightness of the projection device 13 needs to be reduced.

[0193] In one embodiment, a plurality of projection brightnesses are preset in the projection device 13, and each projection brightness corresponds to a projection distance interval (the distance between the X-ray emitting device 10 and the X-ray receiving device 20). For example, when the projection distance interval is m1-m2 (m1<m2), the projection brightness is the first brightness; when the projection distance interval is m2-m3 (m2<m3), the projection brightness is the second brightness (the second brightness is greater than the first brightness). In this way, according to the interval in which the distance between the detected X-ray emitting device 10 and the X-ray receiving device 20 is located, the projection brightness corresponding to the interval can be found, thereby controlling the projection device 13 to project with the projection brightness.

[0194] In other embodiments, a plurality of projection brightnesses are preset in the projection device 13, and the projection brightness and projection distance may correspond one to one, that is, the projection brightness increases with the increase of the projection distance. In this way, according to the detected distance (projection distance) between the X-ray emitting device 10 and the X-ray receiving device 20, the projection brightness corresponding to the distance may be directly found, thereby controlling the projection device 13 to project with the projection brightness.

[0195] It should be noted that the projection brightness of the projection device 13 can be adjusted in a variety of ways. For example, the driving current of the light source in the projection device 13 can be controlled to change its projection brightness. The projection brightness is directly proportional to the driving brightness. For another example, the projection device 13 can be set with multiple levels of projection brightness, and the projection brightness can be adjusted by directly triggering the selection of the corresponding level through the processor 30 or the control unit 15.

[0196] In some embodiments, after the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes, the control unit 15 may further adjust the projection brightness of the projection device 13, which may include:

[0197] Step S21: The processor 30 generates a second adjustment instruction when the spatial position relationship between the X-ray emitting device 10 and the X-ray receiving device 20 changes.

[0198] Step S22 : the control unit 15 adjusts the projection brightness of the projection device 13 in response to the second adjustment instruction, so that the projection brightness matches the distance between the X-ray emitting device 10 and the X-ray receiving device 20 .

[0199] In some embodiments, the method of adjusting the projection brightness of the projection device 13 by the control unit 15 may be the same as the method of adjusting the projection brightness of the projection device 13 by the processor 30, and will not be repeated here.

[0200] This document is described with reference to various exemplary embodiments. However, those skilled in the art will recognize that changes and modifications may be made to the exemplary embodiments without departing from the scope of this document. For example, the various operational steps and components used to perform the operational steps may be implemented in different ways (e.g., one or more steps may be deleted, modified, or incorporated into other steps) depending on the specific application or considering any number of cost functions associated with the operation of the system.

[0201] In the above embodiments, all or part of the embodiments may be implemented through software, hardware, firmware, or any combination thereof. Furthermore, as will be appreciated by those skilled in the art, the principles herein may be embodied in a computer program product on a computer-readable storage medium pre-installed with computer-readable program code. Any tangible, non-transitory computer-readable storage medium may be used, including magnetic storage devices (hard disks, floppy disks, etc.), optical storage devices (CD-ROMs, DVDs, Blu-ray discs, etc.), flash memory, and / or the like. These computer program instructions may be loaded onto a general-purpose computer, a special-purpose computer, or other programmable data processing device to form a machine, such that the instructions executed on the computer or other programmable data processing device can generate a device that implements a specified function. These computer program instructions may also be stored in a computer-readable memory, which can instruct the computer or other programmable data processing device to operate in a specific manner, such that the instructions stored in the computer-readable memory can form an article of manufacture, including an implementation device that implements a specified function. The computer program instructions may also be loaded onto a computer or other programmable data processing device, thereby causing the computer or other programmable device to execute a series of operational steps to generate a computer-implemented process, such that the instructions executed on the computer or other programmable device can provide the steps for implementing the specified function.

[0202] Although the principles of this invention have been shown in various embodiments, many modifications of structure, arrangement, proportion, elements, materials and components that are particularly suitable for specific environments and operational requirements can be used without departing from the principles and scope of this invention. The above modifications and other changes or amendments are intended to be included within the scope of this invention.

[0203] The foregoing detailed description has been described with reference to various embodiments. However, those skilled in the art will recognize that various modifications and changes can be made without departing from the scope of this disclosure. Therefore, the present disclosure will be considered in an illustrative rather than a restrictive sense, and all such modifications will be included within its scope. Similarly, the advantages, other advantages and solutions to the problems of the various embodiments have been described above. However, the benefits, advantages, solutions to the problems and any elements that can produce these, or make them more specific, should not be interpreted as critical, required or necessary. The term "comprising" and any other variants used in this article are all non-exclusive inclusions, so that a process, method, article or device that includes a list of elements includes not only these elements, but also other elements that are not explicitly listed or do not belong to the process, method, system, article or device. In addition, the term "coupled" and any other variants used in this article refer to physical connections, electrical connections, magnetic connections, optical connections, communication connections, functional connections and / or any other connections.

[0204] Those skilled in the art will recognize that many changes can be made to the details of the above embodiments without departing from the basic principles of the invention. Therefore, the scope of the present invention should be determined solely by the claims.

Claims

1. A radioactive ray imaging device, characterized in that: include: An X-ray emitting device, used for emitting radioactive rays toward the person being examined; An X-ray receiving device includes a detector and a planar component arranged on the transmission path of the radioactive rays, wherein the detector is used to receive the radioactive rays that pass through the subject; a projection device, disposed in the X-ray emitting device; a position detection device, configured to detect a spatial positional relationship between the X-ray emitting device and the X-ray receiving device; Processor for: Controlling the projection device to project a projection image onto the planar component of the X-ray receiving device to form a projection screen; the projection screen includes a positioning focus item, and the positioning focus item is used to guide the subject to perform positioning; Obtain the spatial position relationship between the X-ray emitting device and the X-ray receiving device detected by the position detection device, and when the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, adjust the projection focal length of the projection device so that the projection focus of the projection device falls on the planar component, and / or adjust the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection picture remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or so that the position and / or size of the positioning focus item in the projection picture relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component.

2. The radioactive ray imaging device according to claim 1, characterized in that The X-ray emitting device comprises: The handpiece, which produces X-rays; A beam limiter, wherein the projection device is arranged in the beam limiter, and the beam limiter also includes a reflection device, wherein: The projection device is further used to generate visible light to form a visible light irradiation field area on the planar component; The reflecting device is used to reflect the visible light generated by the projection device so that the visible light irradiation field area and the ray radiation field area formed by the X-rays generated by the head overlap on the plane component.

3. The radioactive ray imaging device according to claim 2, characterized in that: The beam limiter further includes: a control unit; when the spatial positional relationship between the X-ray emitting device and the X-ray receiving device changes, the processor adjusts the projection focal length in the projection device so that the projection focus of the projection device falls on the planar component, and / or adjusts the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection image remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or the position and / or size of the positioning focus item in the projection image relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component, including: The processor generates a first adjustment instruction when a spatial position relationship between the X-ray emitting device and the X-ray receiving device changes; In response to the first adjustment instruction, the control unit adjusts the projection focal length in the projection device so that the projection focus of the projection device falls on the planar component, and / or adjusts the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection picture remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or so that the position and / or size of the positioning focus item in the projection picture relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component.

4. The radioactive ray imaging device according to claim 3, characterized in that: The control unit adjusting the projection focal length of the projection device in response to the first adjustment instruction so that the projection focus of the projection device falls on the plane component includes: The control unit obtains the projection image currently displayed on the plane component; The control unit determines whether the clarity of the currently displayed projection image is consistent with a reference clarity; the reference clarity is the clarity of the projection image when the projection focus of the projection device falls on the plane component; When it is determined that the clarity is inconsistent with the reference clarity, the control unit controls the adjustment of the projection focal length of the projection device so that the projection focus of the projection device falls on the plane component.

5. The radioactive ray imaging device according to claim 3, characterized in that: The control unit adjusting the projection focal length of the projection device in response to the first adjustment instruction so that the projection focus of the projection device falls on the plane component includes: The control unit acquires a current projection distance of the projection device, where the projection distance is the distance between the projection device and a planar component in the X-ray receiving device; According to the current projection distance, the control unit controls the projection device to adjust the projection focal length so that the projection focus of the projection device falls on the plane component.

6. The radioactive ray imaging device according to claim 3, characterized in that: The control unit adjusts the pixel information of the projected image in response to the first adjustment instruction so that the position and / or size of the positioning focus item in the projection image remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or so that the position and / or size of the positioning focus item in the projection image relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component, including: The control unit obtains a reference position and / or a reference size corresponding to the focus item in the projection image; The control unit obtains the current position and parameter information of the projection device; The control unit adjusts pixel information of the projected image based on the reference position and / or reference size corresponding to the positioning focus item and the current position and parameter information of the projection device, so that the position and / or size of the positioning focus item in the projection image remains unchanged from the reference position and / or reference size corresponding to the positioning focus item; Alternatively, the control unit obtains a reference position and / or a reference size of the placement focus item in the projection image relative to the plane component; The control unit obtains the current position and parameter information of the projection device; The control unit adjusts the pixel information of the projected image based on the reference position and / or reference size of the positioning focus item relative to the planar component and the current position and parameter information of the projection device, so that the position and / or size of the positioning focus item relative to the planar component in the projection picture remains unchanged from the reference position and / or reference size of the positioning focus item relative to the planar component.

7. The radioactive ray imaging device according to claim 1, characterized in that: When the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, the processor adjusts the projection focal length of the projection device so that the projection focus of the projection device falls on the plane component, including: The processor acquires a projection image currently displayed on the plane component when a spatial positional relationship between the X-ray emitting device and the X-ray receiving device changes; The processor determines whether the clarity of the currently displayed projection image is consistent with a reference clarity; the reference clarity is the clarity of the projection image when the projection focus of the projection device falls on the plane component; When it is determined that the clarity is inconsistent with the reference clarity, the processor controls the adjustment of the projection focal length of the projection device so that the projection focus of the projection device falls on the plane component.

8. The radioactive ray imaging device according to claim 1, characterized in that: When the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, the processor adjusts the projection focal length of the projection device so that the projection focus of the projection device falls on the plane component, including: The processor acquires, when a spatial positional relationship between the X-ray emitting device and the X-ray receiving device changes, a current projection distance of the projection device, where the projection distance is a distance between the projection device and a planar component in the X-ray receiving device; According to the current projection distance, the processor controls the projection device to adjust the projection focal length so that the projection focus of the projection device falls on the plane component.

9. The radioactive ray imaging device according to claim 1, characterized in that: When the spatial positional relationship between the X-ray emitting device and the X-ray receiving device changes, the processor adjusts the pixel information of the projected image so that the position and / or size of the positioning focus item in the projection image remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or so that the position and / or size of the positioning focus item in the projection image relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component, including: The processor obtains a reference position and / or a reference size corresponding to the focus item in the projection image; The processor obtains the current position and parameter information of the projection device; The processor adjusts pixel information of the projected image based on a reference position and / or reference size corresponding to the positioning focus item and the current position and parameter information of the projection device, so that the position and / or size of the positioning focus item in the projection image remains unchanged from the reference position and / or reference size corresponding to the positioning focus item; Alternatively, the processor obtains a reference position and / or a reference size of the placement focus item in the projection image relative to the plane component; The processor obtains the current position and parameter information of the projection device; The processor adjusts the pixel information of the projected image based on the reference position and / or reference size of the positioning focus item relative to the planar component and the current position and parameter information of the projection device, so that the position and / or size of the positioning focus item relative to the planar component in the projection image and the reference position and / or reference size of the positioning focus item relative to the planar component remain unchanged.

10. The radioactive ray imaging device according to claim 4 or 7, characterized in that: Also includes: Camera device; the camera device is used to obtain the projection image currently displayed on the plane component.

11. The radioactive ray imaging device according to claim 5 or 8, characterized in that: Also includes: Distance measuring device; the distance measuring device is used to obtain the current projection distance of the projection device.

12. The radioactive ray imaging device according to claim 6 or 9, characterized in that: The adjusting of the pixel information of the projected image includes at least one or more of the following: The projected image can be translated, the projected image can be scaled, the projected image can be rotated, and the projected image can be keystone corrected.

13. The radioactive ray imaging device according to any one of claims 1 to 9, characterized in that: The positioning concerns include at least one or more of the imaging surface area of ​​the detector, the detection field area of ​​the ionization chamber, the body position diagram of the subject, and the positioning requirements.

14. The device according to claim 1, wherein The processor is further configured to: When the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, the projection brightness of the projection device is adjusted so that the projection brightness matches the distance between the X-ray emitting device and the X-ray receiving device.

15. A radioactive ray imaging device, characterized in that: include: An X-ray emitting device, used for emitting radioactive rays toward the person being examined; An X-ray receiving device includes a detector and a planar component arranged on the transmission path of the radioactive rays, wherein the detector is used to receive the radioactive rays that pass through the subject; a projection device, disposed in the X-ray emitting device; a position detection device, configured to detect a spatial positional relationship between the X-ray emitting device and the X-ray receiving device; Processor for: Controlling the projection device to project a projection image onto the planar component of the X-ray receiving device to form a projection screen; the projection screen includes a positioning focus item, and the positioning focus item is used to guide the subject to perform positioning; Obtain the spatial position relationship between the X-ray emitting device and the X-ray receiving device detected by the position detection device, and when the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, adjust the projection brightness of the projection device so that the projection brightness matches the distance between the X-ray emitting device and the X-ray receiving device.

16. The radioactive ray imaging device according to claim 15, characterized in that: The X-ray emitting device comprises: The handpiece, which produces X-rays; A beam limiter, wherein the projection device is arranged in the beam limiter, and the beam limiter also includes a reflection device, wherein: The projection device is further used to generate visible light to form a visible light irradiation field area on the planar component; The reflecting device is used to reflect the visible light generated by the projection device so that the visible light irradiation field area and the ray radiation field area formed by the X-rays generated by the head overlap on the plane component.

17. The radioactive ray imaging device according to claim 16, characterized in that: The beam limiter further includes: a control unit; and the processor adjusts the projection brightness of the projection device when the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, so that the projection brightness matches the distance between the X-ray emitting device and the X-ray receiving device, including: The processor generates a second adjustment instruction when a spatial position relationship between the X-ray emitting device and the X-ray receiving device changes; The control unit adjusts the projection brightness of the projection device in response to the second adjustment instruction so that the projection brightness matches the distance between the X-ray emitting device and the X-ray receiving device.

18. A method for radioactive ray imaging, applied to a radioactive ray imaging device, comprising an X-ray emitting device and an X-ray receiving device, wherein the X-ray emitting device is provided with a projection device, characterized in that: The method comprises: Controlling the projection device to project a projection image onto the planar component of the X-ray receiving device to form a projection screen; the projection screen includes a positioning focus item, and the positioning focus item is used to guide the subject to perform positioning; When a change in the spatial position relationship between the X-ray emitting device and the X-ray receiving device is detected, the projection focal length in the projection device is adjusted so that the projection focus of the projection device falls on the planar component, and / or the pixel information of the projected image is adjusted so that the position and / or size of the positioning focus item in the projection screen remains unchanged with the reference position and / or reference size corresponding to the positioning focus item, or the position and / or size of the positioning focus item in the projection screen relative to the planar component remains unchanged with the reference position and / or reference size of the positioning focus item relative to the planar component.

19. A method for radioactive ray imaging, applied to a radioactive ray imaging device, comprising an X-ray emitting device and an X-ray receiving device, wherein the X-ray emitting device is provided with a projection device, characterized in that: The method comprises: Controlling the projection device to project a projection image onto the planar component of the X-ray receiving device to form a projection screen; the projection screen includes a positioning focus item, and the positioning focus item is used to guide the subject to perform positioning; Obtain the spatial position relationship between the X-ray emitting device and the X-ray receiving device detected by the position detection device, and when the spatial position relationship between the X-ray emitting device and the X-ray receiving device changes, adjust the projection brightness of the projection device so that the projection brightness matches the distance between the X-ray emitting device and the X-ray receiving device.

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