Detector and medical imaging equipment
By adopting a stepped arrangement design of the reference module and adjustment module in the CT detector system, the problem of large gaps at the splicing of detector sub-modules was solved, improving imaging effect and image quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-15
- Publication Date
- 2026-04-10
AI Technical Summary
In existing CT detector systems, there are large gaps at the joints of detector sub-modules, which affect imaging results.
The design employs a reference module and an adjustment module. The sub-modules of the adjustment module are arranged in a stepped manner, with the middle sub-module being closer to the reference module than the sub-modules on both sides, thereby reducing the gap along the first direction.
This effectively reduces the gaps between detector modules, improving imaging performance and image quality.
Smart Images
Figure CN121817933A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of medical equipment, in particular to a detector and a medical imaging device. BACKGROUND
[0002] With the development of CT, the coverage of a single scan of the human body is required to be larger and larger, and accordingly the number of layers of the CT detector system is more and more, and the corresponding detector sub-modules are also more and more. In order to ensure the consistency of the image, these sub-modules need to be arranged on a circular arc concentric with the focal point, so that the distance from the focal point to the sub-modules is consistent, the radiation attenuation characteristics are consistent, and the subsequent image processing is facilitated. Since the multiple sub-modules are arranged along the X direction and the Z direction along the circular arc concentric with the focal point, the receiving surface of the sub-modules is arranged on a spherical surface. When a rectangular surface is used to divide the spherical surface, different sizes of rectangular surfaces are required to ensure that the gaps at the splicing positions are close to consistent.
[0003] In the related art, due to the consideration of processing, the sub-modules of the detector are usually of consistent size. This results in a larger gap in the X direction of the detector sub-module located in the middle during splicing, which affects the imaging effect and there is room for improvement. SUMMARY
[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a detector which can reduce the larger gap in the first direction and improve the imaging effect.
[0005] The present application further provides a medical imaging device.
[0006] According to the detector of the present application, the detector is used to detect the rays emitted by a radiation source after being attenuated by a scanned object, and the detector comprises: a plurality of detector modules, the plurality of detector modules are arranged on a first curve along a first direction, and the detector module comprises a plurality of sub-modules, and the plurality of sub-modules are arranged on a second curve along a second direction which is orthogonal to the first direction; Among the plurality of detector modules, the detector module located in the middle is set as a reference module, and the detector modules located on both sides of the reference module are set as adjustment modules, and the plurality of sub-modules of the adjustment modules are arranged in a stepped manner in such a manner that the sub-module in the middle is closer to the reference module than the sub-modules on both sides.
[0007] According to the detector of the present application, the larger gap between two adjacent sub-modules in the first direction can be reduced, and the imaging effect can be improved.
[0008] In some examples of the present application, the greater the misalignment of the sub-modules of the adjustment module farther away from the reference module, so that the spacing between any pair of adjacent sub-modules along the first direction is less than or equal to a preset gap value.
[0009] In some examples of the present application, the sub-modules of the adjustment module are configured as a plurality of module groups, each module group comprising at least one sub-module, and each module group is closer to the reference module than the outer module groups.
[0010] In some examples of the present application, the adjustment modules on both sides of the reference module are symmetrically distributed with the reference module as the axis of symmetry.
[0011] In some examples of the present application, among the module groups of the adjustment module, the module groups on both sides of the middle module group are symmetrically distributed with the middle module group as the axis of symmetry.
[0012] In some examples of the present application, among any pair of adjacent sub-modules along the second direction, the orthographic projections of the two sub-modules along the second direction have overlapping portions.
[0013] In some examples of the present application, among the sub-modules of the reference module, any sub-module is directly opposite to the adjacent sub-module along the second direction.
[0014] In some examples of the present application, the spacing between any two adjacent sub-modules along the first direction is equal.
[0015] In some examples of the present application, the spacing between any two adjacent sub-modules along the first direction is equal to the spacing between the most edge sub-module and the adjacent sub-module along the first direction.
[0016] In some examples of the present application, the top surface of the sub-module is tangent to the second curve, and the first curve and the second curve are configured as curves of the same spherical surface.
[0017] In some examples of the present application, along the first direction, the orthographic projection of the top surface of the sub-module is tangent to the center of the orthographic projection of the top surface.
[0018] In some examples of the present application, the detector is a photon counting detector, and the detector module further comprises: a conductive film disposed on a top surface of the plurality of sub-modules of the corresponding detector module, in a pair of adjacent sub-modules of the detector module, a width dimension of a coincident part of the two sub-modules along the first direction in a projection of the two sub-modules along the second direction is A, and a width of the conductive film is B, satisfying a relationship: B
[0019] The medical imaging device according to the present application comprises: a scan frame, a radiation source and the detector described above; the radiation source and the detector are respectively arranged on the scan frame, the radiation source is configured to emit rays to the scan object, and the detector is configured to receive rays attenuated by the scan object and convert the rays into electrical signals.
[0020] Additional aspects and advantages of the present application will be made apparent from the following description, which, taken together with the accompanying drawings, will illustrate the embodiments of the application. BRIEF DESCRIPTION OF DRAWINGS
[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which: Figure 1 is a schematic diagram of a reference module and a plurality of adjustment modules according to an embodiment of the present application; Figure 2 is a schematic diagram of a reference module and an adjustment module on one side according to an embodiment of the present application (the figure indicates the size adjusted compared with the rectangular array); Figure 3 is a schematic diagram of a reference module and an adjustment module on one side according to an embodiment of the present application; Figure 4 is a schematic diagram of a detector module according to an embodiment of the present application (the V-shaped lines in the figure represent the X-direction gap between the detector module and the adjacent detector module when the rectangular array is present); Figure 5 is a schematic diagram of a detector module according to an embodiment of the present application; Figure 6 is a schematic diagram of a detector module according to an embodiment of the present application (the conductive film is omitted); Figure 7 is a schematic diagram of a detector module according to an embodiment of the present application (the number of sub-modules is different); Figure 8 is a schematic diagram of a plurality of detector modules according to an embodiment of the present application; Figure 9 is a schematic diagram of a plurality of detector modules according to an embodiment of the present application from another angle; Figure 10 is a schematic view of a spherical arrangement of a plurality of sub-modules of a plurality of detector modules according to an embodiment of the present application; Figure 11 is a schematic view of a detector according to an embodiment of the present application.
[0022] Reference Signs: detector module 100; reference module 101; adjustment module 102; first adjustment module 1021; second adjustment module 1022; module group 10; sub-module 11; top surface 111; first sub-module 112; second sub-module 113; third sub-module 114; bracket 12; conductive film 20; detector 200; housing 201. DETAILED DESCRIPTION
[0023] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters indicate the same or similar elements throughout the attached drawing figures. The embodiments described below are exemplary, and are merely intended to explain the present application, and are not intended to limit the present application.
[0024] Reference is made below to Figures 1-11 a detector 200 and a medical imaging apparatus according to embodiments of the present application.
[0025] The detector 200 is used to detect rays emitted by a radiation source after being attenuated by a scanned object, wherein the detector 200 is applied in an apparatus not limited to a medical imaging apparatus, for example, a CT scanner, and can also be applied in other apparatuses requiring scanning imaging, for example, a security inspection machine.
[0026] In the CT scanner, an X-Y-Z three-axis coordinate is usually used, wherein the X direction can be the arrangement direction of the plurality of detector modules 100, the Y direction is the vertical direction, the Z direction is perpendicular to the plane formed by the X-Y two directions, and the Z direction is usually the rotation axis direction of the scanner. The plurality of sub-modules 11 of the detector module 100 can be arranged along the Z direction.
[0027] As shown in Figures 9-11 , the detector 200 according to an embodiment of the present application comprises a plurality of detector modules 100 arranged along a first direction (X direction) on a first curve, and each detector module 100 comprises a plurality of sub-modules 11 arranged along a second direction (Z direction) orthogonal to the first direction (X direction) on a second curve.
[0028] The detector 200 is configured to detect the rays emitted by the radiation source after being attenuated by the scanned object. Specifically, the sub-module 11 is configured to detect the rays emitted by the radiation source after being attenuated by the scanned object, and convert the received rays into electrical signals. In a CT scanner, the radiation source can emit fan-shaped or cone-shaped ray beams, each of which includes a plurality of rays. The radiation source projects the ray beams from its focal point to the scanned object. The radiation source includes a tube (not shown) and a high-voltage generator (not shown), which provides high-voltage electricity to the tube, and the tube generates the rays. In the embodiments described in the present application, the rays are X-rays.
[0029] The tissues and structures inside the scanned object cause the attenuation of the rays passing through the scanned object to be different, so the intensities of the rays passing through the scanned object are different. The optical signals of the attenuated rays are received by the sub-module 11 and converted into electrical signals, which are signals representing the intensities of the rays passing through the scanned object. The electrical signal generated by each sub-module 11 is proportional to the intensity of the received optical signal of the attenuated rays.
[0030] In one embodiment, the sub-module 11 includes a scintillator array (not shown), a photodiode (not shown), and a substrate (not shown). The scintillator array is configured to receive the rays attenuated by the scanned object and convert the rays into visible light, the photodiode is configured to obtain electrical signals based on the visible light, and the substrate is configured to carry the scintillator array and the photodiode.
[0031] In some embodiments, the detector is a scintillator detector, and the scintillator array can be a 32x16 or 16x16 matrix structure. In other embodiments, the detector is a photon counting detector, and the sub-module 11 includes a cadmium zinc telluride crystal (CdZnTe, CZT), which is configured to receive the rays attenuated by the scanned object and convert the rays into electrical signals. Specifically, the X-rays generate electron-hole pairs in the sub-module 11, and after a high voltage (e.g., 800V-1000V) is applied to the top cathode (at the top surface 111) and the pixelated anode end of the sub-module 11, the electrons move towards the anode to obtain a current, thereby achieving direct conversion of X-rays (X-rays→electrical signals). As shown in Figure 5 and Figure 7 As shown, a conductive film 20 is arranged on the top surface 111 of the plurality of sub-modules 11, and the high voltage can be applied through the conductive film 20.
[0032] As shown in Figure 11 The detector 200 further includes a housing 201, and the plurality of detector modules 100 are arranged in the housing 201. By arranging the plurality of detector modules 100 along a first direction (X direction) on a first curve, the plurality of sub-modules 11 are arranged along a second direction (Z direction) orthogonal to the first direction (X direction) on a second curve.
[0033] The center of the second curve coincides with or is near the focal point of the radiation source, and the top surface 111 of the sub-module 11 is tangent to the second curve. In this way, the rays emitted by the radiation source can be perpendicular to the tangent position of the top surface 111 of the sub-module 11 and the second curve, and the image quality of the image reconstructed by the projection data converted by the electrical signal generated by the sub-module 11 is higher.
[0034] It should be noted that the "coincidence" described herein refers to the coincidence that can be achieved in the industry, rather than the absolute coincidence in the mathematical sense. Therefore, within a certain error (for example, but not limited to, the distance between the center of the second curve and the focal point of the radiation source is 3mm), it is considered to achieve the coincidence proposed in the present application.
[0035] As shown in Figure 1 of the plurality of detector modules 100, the detector module 100 located in the middle is set as a reference module 101, and the detector modules 100 located on both sides of the reference module 101 are set as adjustment modules 102. The plurality of sub-modules 11 of the adjustment module 102 are arranged in a stepped manner in such a way that the sub-modules 11 in the middle are closer to the reference module 101 than the sub-modules 11 on both sides. In this way, the larger gap in the first direction can be reduced, and the imaging effect can be improved.
[0036] It can be understood that if the number of detector modules 100 is even, the detector module 100 located in the middle is two, that is, the number of reference modules 101 is two, and if the detector module 100 located in the middle is one, the number of reference modules 101 is one.
[0037] The plurality of sub-modules 11 can be understood as a rectangular array first, and then the plurality of sub-modules 11 in the rectangular array are rearranged to understand the present solution. Specifically, in the plurality of sub-modules 11 of the adjustment module 102, the farther the sub-module 11 is located in the middle, the greater the distance of the sub-module 11 moving towards the reference module 101 in the first direction (X direction), and the closer the sub-module 11 is to the edge, the smaller the distance of the sub-module 11 moving towards the reference module 101 in the first direction (X direction). The moving distance of the sub-module 11 located at the edge is 0 (since the X direction gap of the sub-module 11 located at the edge is the smallest, the moving distance of the sub-module 11 located at the edge is 0), so that the plurality of sub-modules 11 of the adjustment module 102 can be arranged in a stepped manner in such a way that the sub-modules 11 in the middle are closer to the reference module 101 than the sub-modules 11 on both sides.
[0038] In some embodiments of the present application, as shown in Figure 1 and Figure 2 the farther the sub-module 11 of the adjustment module 102 is from the reference module 101, the greater the degree of misalignment of the sub-module 11, so that the distance between any pair of adjacent sub-modules 11 in the first direction (X direction) is less than or equal to a preset gap value.
[0039] For the more distant adjustment module 102 of the plurality of sub-modules 11 of the reference module 101, the greater the misalignment degree, can refer to Figure 1 and Figure 2 As shown in Figure 1 and Figure 2 The reference module 101 can have N adjustment modules 102 along one side of the first direction (X direction), from close to the reference module 101 to far from the reference module 101, the N adjustment modules 102 can be respectively the first adjustment module 1021, the second adjustment module 1022, and the N adjustment module, each adjustment module 102 can include eight sub-modules 11, among the eight sub-modules 11 of each adjustment module 102, the two middle sub-modules 11 are the two middle sub-modules 11, along the second direction (Z direction), the remaining six sub-modules 11 are distributed on both sides of the two middle sub-modules 11, that is, there are three sub-modules 11 on one side, the three sub-modules 11 on one side can be respectively denoted as the first sub-module 112, the second sub-module 113, and the third sub-module 114, wherein the third sub-module 114 is closest to the two middle sub-modules 11, and the first sub-module 112 is farthest from the two middle sub-modules 11.
[0040] As shown in Figure 2 The plurality of sub-modules 11 can be understood as a rectangular array arrangement, at this time, the spacing between the first sub-module 112 of the first adjustment module 1021 and the corresponding sub-module 11 of the reference module 101 is D1, the spacing between the second sub-module 113 of the first adjustment module 1021 and the corresponding sub-module 11 of the reference module 101 is D2, the spacing between the third sub-module 114 of the first adjustment module 1021 and the corresponding sub-module 11 of the reference module 101 is D3, the spacing between the two middle sub-modules 11 of the first adjustment module 1021 and the corresponding sub-module 11 of the reference module 101 is D4, D4>D3>D2>D1, then the first sub-module 112 of the first adjustment module 1021 is not moved, the second sub-module 113 of the first adjustment module 1021 is moved (D2-D1) along the first direction (X direction) to close to the reference module 101, the third sub-module 114 of the first adjustment module 1021 is moved (D3-D1) along the first direction (X direction) to close to the reference module 101, and the middle sub-module 11 of the first adjustment module 1021 is moved (D4-D1) along the first direction (X direction) to close to the reference module 101.
[0041] Then, the first submodule 112 of the second adjustment module 1022 is not moved, the second submodule 113 of the second adjustment module 1022 is moved by 2 times (D2-D1) in the first direction (X direction) to the reference module 101, the third submodule 114 of the second adjustment module 1022 is moved by 2 times (D3-D1) in the first direction (X direction) to the reference module 101, the middle submodule 11 of the second adjustment module 1022 is moved by 2 times (D4-D1) in the first direction (X direction) to the reference module 101, and similarly, the first submodule 112 of the Nth adjustment module is not moved, the second submodule 113 of the Nth adjustment module is moved by N times (D2-D1) in the first direction (X direction) to the reference module 101, the third submodule 114 of the Nth adjustment module is moved by N times (D3-D1) in the first direction (X direction) to the reference module 101, and the middle submodule 11 of the Nth adjustment module is moved by N times (D4-D1) in the first direction (X direction) to the reference module 101. In this way, the more the multiple submodules 11 of the adjustment module 102 far away from the reference module 101, the greater the misalignment degree, and the gap between every two adjacent submodules 11 in the X direction is D1, so that the gap between any pair of adjacent submodules 11 in the first direction (X direction) is less than or equal to the preset gap value, and the large gap of all submodules 11 in the first direction can be reduced, and the imaging effect is improved.
[0042] The greater misalignment degree of the multiple submodules 11 of the adjustment module 102 far away from the reference module 101 can also be understood as that the size of the orthographic projection of the adjustment module 102 far away from the reference module 101 in the first direction (X direction) is greater, and the size of the orthographic projection of the adjustment module 102 close to the reference module 101 in the first direction (X direction) is smaller. It should be explained that, after at least part of the submodules 11 of the adjustment module 102 close to the reference module 101 are moved towards the reference module 101, the gap between the submodule 11 of the adjacent adjustment module 102 on the side of the adjustment module 102 away from the reference module 101 and the submodule 11 of the adjustment module 102 will be larger, so the submodule 11 of the adjacent adjustment module 102 on the side of the adjustment module 102 away from the reference module 101 needs to be moved by a larger distance, so that the gap between any pair of adjacent submodules 11 in the first direction (X direction) is less than or equal to the preset gap value, and therefore, the greater misalignment degree of the multiple submodules 11 of the adjustment module 102 far away from the reference module 101.
[0043] The following is a specific embodiment to express the technical solution proposed in the present application. Figure 1As shown, the number of detector modules 100 is seven, each detector module 100 includes eight sub-modules 11, among the seven detector modules 100, the middlemost detector module 100 is set as a reference module 101, and the remaining six are uniformly distributed on both sides of the reference module 101 along the first direction and are all set as adjustment modules 102. The plurality of sub-modules 11 can be first understood as a rectangular array arrangement.
[0044] Then, among the eight sub-modules 11 of each adjustment module 102, the two sub-modules 11 located in the middlemost are the two sub-modules 11 closest to the reference module 101 along the first direction (X direction), and the remaining six sub-modules 11 are distributed on both sides of the two sub-modules 11 located in the middlemost, among the remaining six sub-modules 11, the two sub-modules 11 closest to the middlemost sub-module 11, the two sub-modules 11 closest to the two sub-modules 11 located at the edge, and the two sub-modules 11 located at the edge gradually decrease in moving distance, and the moving distance of the two sub-modules 11 located at the edge can be zero.
[0045] And the moving distance of the sub-modules 11 of the adjustment module 102 adjacent to the reference module 101 is the reference distance, the moving distance of the sub-modules 11 of the adjustment module 102 outside the adjustment module 102 adjacent to the reference module 101 is twice the reference distance, the moving distance of the sub-modules 11 of the adjustment module 102 further outside is three times the reference distance, and so on. In this way, the spacing of any pair of sub-modules 11 adjacent along the first direction can be less than or equal to a preset gap value. The larger gap along the first direction can be reduced to improve the imaging effect.
[0046] The preset gap value can be a maximum size that has been tested to have little effect on image quality and can meet the requirements of medical diagnosis. As some embodiments of the present application, the preset gap value can be the X direction gap value of the sub-module 11 located at the outermost in the Z direction when the plurality of sub-modules 11 are arranged in a rectangular array.
[0047] In some embodiments of the present application, as shown in Figure 3 As shown, the plurality of sub-modules 11 of the adjustment module 102 are configured as a plurality of module groups 10, each module group 10 includes at least one sub-module 11, and each module group 10 in the plurality of module groups 10 is closer to the reference module 101 than the outer module group 10.
[0048] The module group 10 can include one sub-module 11, or the module group 10 can include a plurality of sub-modules 11. It can be understood that in the plurality of module groups 10 of the adjustment module 102, the plurality of module groups 10 can each include one sub-module 11, or the plurality of module groups 10 can each include a plurality of sub-modules 11, or part of the module groups 10 can include one sub-module 11, and the other part of the module groups 10 can include a plurality of sub-modules 11.
[0049] When each module group 10 includes one sub-module 11, the effect is excellent, but the arrangement of the plurality of sub-modules 11 is difficult. When at least one module group 10 includes a plurality of sub-modules 11, the effect is slightly worse than the scheme in which each module group 10 includes one sub-module 11, but the requirements of medical diagnosis can be met, and the arrangement difficulty is greatly reduced.
[0050] In some embodiments of the present application, as shown in Figure 1 , Figure 10 and Figure 11 , the adjustment modules 102 on both sides of the reference module 101 are symmetrically distributed with the reference module 101 as the symmetric axis. That is, the plurality of detector modules 100 are symmetrically distributed. As some embodiments of the present application, the adjustment modules 102 on both sides of the reference module 101 are symmetrically distributed with the center axis of the reference module 101 in the second direction (Z direction) as the symmetric axis. When thus assembled, the position of the reference module 101 can be calibrated, the adjustment modules 102 on both sides are directly installed according to the symmetric size, the assembly error can be greatly reduced, the assembly efficiency can be improved, the geometric parameters of the symmetric array are beneficial to simplify the data reconstruction algorithm, reduce the computing power consumption, and there is no need to make differential calibration for the adjustment modules 102 on both sides, in addition, the imaging field of view can be symmetric and uniform, and the edge artifacts can be eliminated. In other embodiments, the detector 200 is an asymmetric detector, the number of the adjustment modules 102 on both sides of the reference module 101 is different, and the symmetric distribution of the adjustment modules 102 on both sides of the reference module 101 refers to the symmetric distribution of the adjustment modules 102 on both sides of the reference module 101 with the number of the adjustment modules 102 on the side with fewer number as the comparison object.
[0051] As some embodiments of the present application, as shown in Figures 5-9 , the detector module 100 further includes a support 12, and the plurality of sub-modules 11 of the detector module 100 are arranged in the corresponding supports 12.
[0052] As some embodiments of the present application, as shown in Figure 11 , the detector 200 further includes a housing 201, and the plurality of detector modules 100 are arranged in the housing 201.
[0053] In some embodiments of the present application, as shown in Figures 1-4 , Figure 10and Figure 11 As shown, in the multiple module groups 10 of the adjustment module 102, the module groups 10 on both sides of the middle module group 10 are symmetrically distributed with the middle module group 10 as the axis of symmetry. That is, the multiple module groups 10 are symmetrically distributed. As some embodiments of this application, the module groups 10 on both sides of the middle module group 10 are symmetrically distributed with the central axis of the middle module group 10 along the first direction (X direction) as the axis of symmetry. During assembly, the position of the middle module group 10 can be calibrated, and the module groups 10 on both sides can be directly installed according to symmetrical dimensions, which can significantly reduce assembly errors and improve assembly efficiency. Moreover, the geometric parameters of the symmetrical array are beneficial to simplifying the data reconstruction algorithm, reducing computing power consumption, and eliminating the need for differential calibration of the module groups 10 on both sides. In addition, it can make the imaging field of view symmetrical and uniform, and eliminate edge artifacts.
[0054] In some embodiments of the present invention, such as Figures 1-4 As shown, in any pair of adjacent sub-modules 11 along the second direction (Z direction), the orthographic projections of the two sub-modules 11 along the second direction (Z direction) have overlapping portions. That is, in any pair of adjacent sub-modules 11 along the second direction (Z direction), the two sub-modules 11 are either directly opposite or partially misaligned. The partial misalignment can be understood as the orthographic projections of the two sub-modules 11 along the second direction (Z direction) not completely overlapping in the first direction (X direction) but having overlapping areas. In other words, the orthographic projections of the two sub-modules 11 along the second direction (Z direction) partially overlap in the first direction (X direction), meaning that the orthographic projections of the two sub-modules 11 along the second direction (Z direction) are not completely misaligned in the first direction (X direction).
[0055] This arrangement allows the multiple sub-modules 11 of the adjustment module 102 to be arranged in a stepped manner, with the middle sub-module 11 being closer to the reference module 101 than the sub-modules 11 on both sides. This ensures that the spacing between any pair of adjacent sub-modules 11 along the first direction (X direction) is less than or equal to a preset gap value. This reduces the large gap along the first direction (X direction), improves the imaging effect, and prevents two adjacent sub-modules 11 along the second direction (Z direction) from being completely misaligned, making it easier to attach the conductive film 20 to the detector module 100.
[0056] In some embodiments of the present invention, such as Figures 1-3As shown, in the plurality of sub-modules 11 of the reference module 101, any sub-module 11 and the adjacent sub-module 11 are directly opposite along the second direction (Z direction), that is, in the plurality of sub-modules 11 of the reference module 101, the orthographic projection of any adjacent pair of two sub-modules 11 along the second direction (Z direction) is not misaligned along the first direction (X direction). By making any sub-module 11 and the adjacent sub-module 11 of the plurality of sub-modules 11 of the reference module 101 directly opposite along the second direction (Z direction), the plurality of sub-modules 11 of the reference module 101 can be arranged in order, thereby improving the accuracy of using the reference module 101 as a reference, facilitating the position adjustment of the plurality of sub-modules 11 of the adjustment module 102, facilitating the accurate control of the X direction gap of the sub-module 11, reducing the larger gap along the first direction (X direction) to the required value, and facilitating the X direction gap of all two sub-modules 11 adjacent along the first direction to be consistent, which can well solve the problem of gap affecting algorithm reconstruction and improve the imaging effect.
[0057] In some embodiments of the present application, the interval of any two sub-modules 11 adjacent along the first direction is equal, that is, in different detector modules 100, the interval of any two sub-modules 11 adjacent along the first direction in the sub-modules 11 at the same position in the second direction is equal.
[0058] In some embodiments of the present application, the interval of any two sub-modules 11 adjacent along the first direction is equal to the interval of the sub-module 11 located at the edge along the second direction and the adjacent sub-module 11 along the first direction, that is, the interval of any two sub-modules 11 adjacent along the first direction is equal, and the interval of any two sub-modules 11 adjacent along the first direction is equal to the interval of the sub-module 11 located at the edge along the second direction and the adjacent sub-module 11 along the first direction. It can be understood that the interval of the sub-module 11 located at the edge along the second direction and the adjacent sub-module 11 along the first direction (D1 described above) is the smallest. By making the interval of any two sub-modules 11 adjacent along the first direction equal to the interval of the sub-module 11 located at the edge along the second direction and the adjacent sub-module 11 along the first direction, not only can the X direction gap of all two sub-modules 11 adjacent along the first direction be consistent, but also the X direction gap of the adjacent two sub-modules 11 can be small, which can well solve the problem of gap affecting algorithm reconstruction and improve the imaging effect.
[0059] In some embodiments of the present application, the top surface 111 of the sub-module 11 is tangent to the second curve, and the first curve and the second curve are configured as curves of the same spherical surface. Such arrangement can arrange the plurality of sub-modules 11 on the spherical surface, and when the number of sub-modules 11 is large, the distance between the top surface 111 of the plurality of sub-modules 11 and the focal point of the tube can be close or consistent, which is conducive to the correction of the algorithm and the improvement of the image quality.
[0060] In some embodiments of the present application, along the first direction, the orthogonal projection of the top surface 111 of the sub-module 11 is tangent to the orthogonal projection of the second curve at the center of the orthogonal projection of the top surface 111.
[0061] As some embodiments of the present application, a plane is set, which is perpendicular to the first direction, i.e. the normal line of the plane is parallel to the first direction, the orthogonal projection of the top surface 111 of the sub-module 11 on the plane is tangent to the orthogonal projection of the second curve on the plane at the center of the orthogonal projection of the top surface 111. In this way, the central axis of the sub-module 11 points to the focal point of the radiation source, and the rays radiated from the focal point of the radiation source can be perpendicular to the center point of the top surface 111, and the image quality of the image reconstructed from the projection data converted from the electrical signals generated by the sub-module 11 is higher.
[0062] As some embodiments of the present application, along the first direction, the orthogonal projection of the top surface 111 of the sub-module 11 is tangent to the orthogonal projection of the second curve at the center of the orthogonal projection of the top surface 111. In this way, the central axis of the sub-module 11 points to the focal point of the radiation source, and the rays radiated from the focal point of the radiation source can be perpendicular to the center point of the top surface 111, and the image quality of the image reconstructed from the projection data converted from the electrical signals generated by the sub-module 11 is higher.
[0063] In some embodiments of the present application, as shown in Figure 4 、 Figure 6 The detector module 100 further comprises a conductive film 20, which is arranged on the top surface 111 of the plurality of sub-modules 11 of the corresponding detector module 100. In a pair of adjacent sub-modules 10 of the detector module 100, the width of the overlapping part of the orthogonal projection of the two sub-modules 10 along the first direction is A, and the width of the conductive film 20 is B, which satisfies the relationship: B < A.
[0064] As some embodiments of the present application, the conductive film 20 can be arranged on the top surface 111 of the plurality of sub-modules 11 of the corresponding detector module 100 by means of, but not limited to, adhesion. High voltage can be applied through the conductive film 20 to move electrons towards the anode to obtain current, thereby realizing direct conversion of X-rays (X-ray→electric signal). The plurality of sub-modules 11 are arranged on a second curve along a second direction (Z direction) orthogonal to the first direction (X direction), which can make the installation of the conductive film 20 continuous and structurally have no obvious changes (discontinuity, stepped jumps, wrinkles, etc.), have no excessive invalid area, and facilitate the mounting of the conductive film 20, and be conducive to the formation of a stable electric field by the conductive film 20, and the number, layer number and coverage range of the plurality of sub-modules 11 along the second direction are not limited by the conductive film 20.
[0065] It can be understood that one detector module 100 includes a plurality of sub-modules 10, and there can be a plurality of pairs of adjacent and partially misaligned sub-modules 10 in the plurality of sub-modules 10, so that there are a plurality of A, and the width B of the conductive film 20 can be smaller than the smallest A in the plurality of A, i.e., the width B of the conductive film 20 is smaller than the smallest overlapping width of the plurality of sub-modules 10 of one detector module 100. Such arrangement can make the conductive film 20 adapt to the detector module 100 including a plurality of misaligned sub-modules 10, and on the basis of improving the problem that the image reconstruction and image accuracy are affected due to the excessively large gap in the X direction, a continuous, stable and uniform electric field can be formed to improve the imaging effect.
[0066] According to the medical imaging device of the embodiments of the present application, the medical imaging device comprises a scanning gantry, a radiation source and the detector 200 described above. The radiation source and the detector 200 are arranged on the scanning gantry respectively. The radiation source is configured to emit rays to a scanning object, and the detector 200 is configured to receive rays attenuated by the scanning object. When the scanning gantry rotates around the Z axis, the radiation source and the detector 200 rotate synchronously with the scanning gantry, and always keep at diametrically opposed positions, so that the detector 200 can receive rays, such as X-rays, emitted by the radiation source and passing through the scanning object.
[0067] The structure of the scanning gantry is not limited, for example, the scanning gantry is formed with a scanning cavity for receiving the scanning object, and the radiation source and the detector 200 are arranged on the diametrically opposed sides of the scanning cavity, etc. Exemplarily, the medical imaging device can further comprise a scanning bed for carrying the scanning object in addition to the above-mentioned components.
[0068] By arranging the detector 200 described above, the large gap along the first direction can be reduced, and the imaging effect can be improved.
[0069] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.
[0070] In the description of the application, "first feature" and "second feature" can include one or more of the features.
[0071] In the description of the application, "a plurality of" means two or more.
[0072] In the description of the application, "above" or "below" the first feature of the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them.
[0073] In the description of the application, "above", "over" and "on" the first feature of the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in height.
[0074] In the description of the application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0075] Although embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the claims and their equivalents.
Claims
1. A detector (200) for detecting rays emitted from a radiation source after attenuation by a scanned object, characterized in that, include: Multiple detector modules (100) are arranged along a first direction on a first curve. Each detector module (100) includes multiple sub-modules (11) arranged along a second direction orthogonal to the first direction on a second curve. Among the plurality of detector modules (100), the detector module (100) located in the middle is set as the reference module (101), and the detector modules (100) located on both sides of the reference module (101) are set as adjustment modules (102). The plurality of sub-modules (11) of the adjustment module (102) are arranged in a stepped manner such that the middle sub-module (11) is closer to the reference module (101) than the sub-modules (11) on both sides.
2. The detector (200) according to claim 1, characterized in that, The greater the misalignment of the sub-modules (11) of the adjustment module (102) that are further away from the reference module (101), the greater the degree of misalignment, so that the spacing between any pair of adjacent sub-modules (11) along the first direction is less than or equal to a preset gap value.
3. The detector (200) according to claim 1, characterized in that, The adjustment module (102) comprises multiple sub-modules (11) configured as multiple module groups (10), each module group (10) including at least one sub-module (11), and in the multiple module groups (10), each module group (10) is closer to the reference module (101) than the outer module group (10).
4. The detector (200) according to claim 1, characterized in that, The adjustment modules (102) on both sides of the reference module (101) are symmetrically distributed with the reference module (101) as the axis of symmetry.
5. The detector (200) according to claim 3, characterized in that, In the multiple groups of modules (10) of the adjustment module (102), the modules (10) on both sides of the middle module group (10) are symmetrically distributed with the middle module group (10) as the axis of symmetry.
6. The detector (200) according to claim 1, characterized in that, In any pair of adjacent sub-modules (11) along the second direction, the orthographic projections of the two sub-modules (11) along the second direction have overlapping portions.
7. The detector (200) according to claim 1, characterized in that, In the plurality of sub-modules (11) of the reference module (101), any one of the sub-modules (11) is directly opposite the adjacent sub-module (11) along the second direction.
8. The detector (200) according to claim 1, characterized in that, The spacing between any two adjacent sub-modules (11) along the first direction is equal.
9. The detector (200) according to claim 8, characterized in that, The distance between any two adjacent sub-modules (11) along the first direction is equal to the distance between the sub-module (11) located at the outermost edge along the second direction and the adjacent sub-module (11) along the first direction.
10. The detector (200) according to claim 1, characterized in that, The top surface (111) of the submodule (11) is tangent to the second curve, and the first curve and the second curve are configured as curves of the same sphere.
11. The detector (200) according to claim 1, characterized in that, Along the first direction, the orthographic projection of the top surface (111) of the submodule (11) is tangent to the orthographic projection of the second curve at the center of the orthographic projection of the top surface (111).
12. The detector (200) according to claim 1, characterized in that, The detector (200) is a photon counting detector. The detector module (100) further includes a conductive film (20). The conductive film (20) is disposed on the top surface (111) of a plurality of sub-modules (11) of the corresponding detector module (100). In a pair of adjacent sub-modules (10) of the detector module (100), the width of the overlapping portion of the orthographic projection of the two sub-modules (10) along the second direction along the first direction is A, and the width of the conductive film (20) is B, satisfying the relationship: B < A.
13. A medical imaging device, characterized in that, include: Scanning frame, radiation source and detector (200) according to any one of claims 1-12; The radiation source and the detector (200) are respectively disposed on the scanning frame. The radiation source is configured to emit rays toward the scanned object, and the detector (200) is configured to receive rays attenuated by the scanned object and convert the rays into electrical signals.