Detector module, CT detector and CT device

Abstract

The present application relates to the field of medical device technology, and discloses a detector module, a CT detector, and a CT device. The detector module includes an anti-scattering module having a plurality of light-transmitting areas and a photoelectric conversion module having a plurality of photoelectric conversion areas arranged at intervals. Each light-transmitting area corresponds to a plurality of photoelectric conversion areas. The width of the gap between two adjacent photoelectric conversion areas within the light-transmitting area is smaller than the width of the gap between two adjacent photoelectric conversion areas in two adjacent light-transmitting areas. The present application increases the effective photosensitive area of ​​the photoelectric conversion area, thereby improving the pixel efficiency of the detector module.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, for example, to a detector module, a CT detector and a CT device. Background Art

[0002] At present, the detector module includes an anti-scatter grating, a scintillator array and a photodiode array. The anti-scatter grating is used to absorb scattered X-rays. The scintillator array is used to convert X-rays that pass through the scanned object into visible light. The photodiode array is used to convert visible light into a current signal. The anti-scatter grating is composed of a side wall with multiple extended lines converging to the focus of the tube. The side wall surrounds a hollow grating hole.

[0003] In the related art, one grating hole corresponds to one photodiode pixel. The projection of the side wall occupies a large area of ​​the photodiode pixel, which reduces the effective light-sensitive area of ​​the photodiode pixel and reduces the pixel efficiency of the detector module.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0006] The embodiments of the present disclosure provide a detector module, a CT detector and a CT device, which increase the effective photosensitivity area of ​​the photoelectric conversion region, thereby improving the pixel efficiency of the detector module.

[0007] In some embodiments, a detector module is provided, comprising: an anti-scattering module having multiple light-transmitting areas and a photoelectric conversion module having multiple photoelectric conversion areas arranged at intervals; each light-transmitting area corresponds to multiple photoelectric conversion areas; wherein the width of the gap between two adjacent photoelectric conversion areas within the light-transmitting area is smaller than the width of the gap between two adjacent photoelectric conversion areas in two adjacent light-transmitting areas.

[0008] Optionally, a plurality of photoelectric conversion regions corresponding to the light-transmitting region are arranged at intervals at least along the scanning length direction.

[0009] Optionally, the number of the plurality of photoelectric conversion regions corresponding to the light-transmitting region distributed in the scanning length direction is 2 to 8.

[0010] Optionally, the anti-scattering module includes a plurality of partition walls, which are arranged crosswise in horizontal and vertical directions to separate a plurality of light-transmitting areas; the thickness of the partition wall is smaller than the width of the gap between two adjacent photoelectric conversion areas corresponding to the partition wall.

[0011] Optionally, the thickness of the partition wall is greater than the width of a gap between two adjacent photoelectric conversion regions within the light-transmitting region.

[0012] Optionally, the detector module further includes: a light conversion module having a plurality of light conversion regions, disposed between the anti-scattering module and the photoelectric conversion module, the plurality of light conversion regions corresponding one to one with the plurality of photoelectric conversion regions.

[0013] Optionally, the area of ​​the light conversion region is larger than the area of ​​the corresponding photoelectric conversion region, and the projection of the light conversion region on the plane where the photoelectric conversion region is located covers the photoelectric conversion region.

[0014] Optionally, anti-reflection materials are filled between the plurality of light conversion regions.

[0015] In some embodiments, a CT detector is further provided, comprising: a plurality of detector modules as in any of the previous embodiments, wherein the plurality of detector modules are spliced ​​at least in a scanning length direction.

[0016] In some embodiments, a CT device is further provided, comprising: a CT detector as in any of the previous embodiments, for receiving rays that pass through a scanned object.

[0017] The detector module, CT detector and CT device provided by the embodiments of the present disclosure can achieve the following technical effects:

[0018] The detector module provided by the embodiment of the present disclosure has an anti-scattering module with multiple light-transmitting areas, that is, the anti-scattering module has multiple light-transmitting areas, and rays (for example, X-rays) can pass through the multiple light-transmitting areas. A photoelectric conversion module with multiple photoelectric conversion areas arranged at intervals, that is, the photoelectric conversion module has multiple photoelectric conversion areas, and the multiple photoelectric conversion areas are arranged at intervals, and the photoelectric conversion module is used to convert visible light into current signals. Each light-transmitting area corresponds to multiple photoelectric conversion areas, so that the adjacent areas of two photoelectric conversion areas within the light-transmitting area will not be blocked, thereby reducing the width of the gap between two adjacent photoelectric conversion areas within the light-transmitting area. By making the width of the gap between two adjacent photoelectric conversion areas within the light-transmitting area smaller than the width of the gap between two adjacent photoelectric conversion areas in two adjacent light-transmitting areas, the effective photosensitive area of ​​the photoelectric conversion area is increased, thereby improving the pixel efficiency of the detector module.

[0019] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0021] Figure 1 is a partial side view schematic diagram of a detector module provided by an embodiment of the present disclosure;

[0022] Figure 2 is a schematic structural diagram of one light-transmitting area corresponding to two light conversion areas provided by another embodiment of the present disclosure;

[0023] Figure 3 is a partial top view structural schematic diagram of a detector module provided by another embodiment of the present disclosure;

[0024] Figure 4 is a schematic structural diagram of one light-transmitting area corresponding to four light conversion areas provided by another embodiment of the present disclosure;

[0025] Figure 5 is a partial top view structural schematic diagram of a detector module provided by another embodiment of the present disclosure;

[0026] Figure 6 is a structural schematic diagram of a CT device provided by another embodiment of the present disclosure;

[0027] Figure 7 is a schematic diagram of the arrangement of detector modules in the related art;

[0028] Figure 8 is a schematic diagram of a main view of a detector module in the related art;

[0029] Fig. 9 It is a schematic diagram of the structure of an anti-scattering grating in the related art.

[0030] Reference numerals:

[0031] 10: Detector module;

[0032] 20: anti-scattering module; 21: light-transmitting area; 22: partition wall;

[0033] 30: optical conversion module; 31: optical conversion area;

[0034] 40: photoelectric conversion module; 41: photoelectric conversion area;

[0035] 50: CT equipment; 51: CT detector; 52: tube. DETAILED DESCRIPTION

[0036] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0037] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0038] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0039] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0040] Unless otherwise stated, the term "plurality" means two or more.

[0041] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0042] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0044] It should be noted that with the development of CT (Computed Tomography), the number of layers of CT detectors is increasing, and the corresponding number of detector pixel units is also increasing. Figure 7 As shown, the detector is divided into dozens of modules along the X direction, and these modules are arranged on an arc concentric with the focus of the tube. Each module is divided into one to dozens of detector modules along the Z direction according to the number of layers required, and each detector module has a 32×16 or 32×32 equal unit matrix. Specifically, the Z direction of the CT device corresponds to the layer direction of the detector module. The X direction of the CT device is perpendicular to the Z direction. In order to ensure consistent detector characteristics, multiple detector modules are arranged in an arc structure along the Z direction, and the distances from the focus of the tube to multiple detector modules are consistent, so as to achieve consistent radiation attenuation characteristics and facilitate subsequent image processing. In the X and Z directions, multiple detector modules are respectively arranged along arcs of equal radius concentric with the focus of the tube, so that the receiving surface of the detector is equivalent to being arranged on a spherical surface, forming a similar Figure 7 Of course, there are also detector modules that are arranged in a straight line in the Z direction, so that the receiving surface of the spliced ​​detector is a part of the cylinder. Figure 8 and Fig. 9 As shown, the detector module in the related art includes an anti-scatter grating, a scintillator array, a photodiode array, a substrate, a control circuit board and a bracket. The anti-scatter grating is composed of a side wall with multiple extension lines converging to the focus of the tube. The side wall surrounds a hollow grating hole.

[0045] Combination Figures 1 to 5 As shown, the embodiment of the present disclosure provides a detector module 10. The detector module 10 includes an anti-scattering module 20 having a plurality of light-transmitting regions 21 and a photoelectric conversion module 40 having a plurality of photoelectric conversion regions 41 arranged at intervals. Each light-transmitting region 21 corresponds to a plurality of photoelectric conversion regions 41. The width of the gap between two adjacent photoelectric conversion regions 41 within the light-transmitting region 21 (e.g., Figure 1 c) is smaller than the width of the gap between two adjacent photoelectric conversion regions 41 in two adjacent light-transmitting regions 21 (e.g. Figure 1 (d)

[0046] In this embodiment, the anti-scatter module 20 has a plurality of light-transmitting areas 21 , that is, the anti-scatter module 20 has a plurality of light-transmitting areas 21 , and rays (such as X-rays) can pass through the plurality of light-transmitting areas 21 .

[0047] In this embodiment, the photoelectric conversion module 40 has a plurality of photoelectric conversion regions 41 arranged at intervals, that is, the photoelectric conversion module 40 has a plurality of photoelectric conversion regions 41 arranged at intervals, and the photoelectric conversion module 40 is used to convert visible light into current signals.

[0048] In this embodiment, each light-transmitting region 21 corresponds to a plurality of photoelectric conversion regions 41 , so that adjacent regions of two photoelectric conversion regions 41 within the light-transmitting region 21 will not be blocked, thereby reducing the width of the gap between two adjacent photoelectric conversion regions 41 within the light-transmitting region 21 .

[0049] In this embodiment, the width of the gap between two adjacent photoelectric conversion regions 41 located within the light-transmitting region 21 (eg Figure 1 c) is smaller than the width of the gap between two adjacent photoelectric conversion regions 41 in two adjacent light-transmitting regions 21 (e.g. Figure 1 In (d), the effective photosensitive area of ​​the photoelectric conversion region 41 is increased, thereby improving the pixel efficiency of the detector module 10.

[0050] Optionally, the photoelectric conversion module 40 uses a photodiode array. The photodiode array has a plurality of photodiode pixels. The photodiode pixels can be used as a photoelectric conversion region 41 for converting visible light into a current signal.

[0051] It can be understood that the photodiode array adopts the existing technology. Specifically, the photodiode array has a photosensitive surface. In the case where the detector module 10 also includes a scintillator array, the photodiode array corresponds to the scintillator array in position.

[0052] Exemplarily, the photodiode array includes a plurality of photodiodes. A photodiode is a semiconductor device composed of a PN structure. The plurality of photodiodes in the photodiode array are arranged according to certain rules. For example, the photodiode array includes a plurality of photodiodes arranged in an array of 8×8, 16×32 or 16×16.

[0053] Of course, the photodiode array may be an integrated photodiode array including an ADC (Analog to Digital Converter).

[0054] It should be noted that the integrated charge of the current signal generated by the photodiode array is proportional to the energy of the X-ray photons captured by the scintillator.

[0055] It should be noted that the pixel efficiency is the effective receiving area of ​​the pixel divided by the theoretical area of ​​the pixel. When the theoretical area of ​​the pixel is determined, increasing the effective receiving area of ​​the pixel can improve the pixel efficiency.

[0056] For example, a photodiode pixel is used as the photoelectric conversion area 41. The theoretical area of ​​the photodiode pixel is determined. When each light-transmitting area 21 corresponds to a plurality of photodiode pixels, within each light-transmitting area 21, adjacent areas of two photodiode pixels will not be blocked, thereby increasing the effective receiving area of ​​the photodiode pixel, improving the pixel efficiency of the photodiode pixel, and thus improving the pixel efficiency of the detector module 10.

[0057] Combination Figures 1 to 5 As shown, in some embodiments, a plurality of photoelectric conversion regions 41 corresponding to the light-transmitting region 21 are arranged at intervals at least along the scanning length direction.

[0058] In this embodiment, the plurality of photoelectric conversion regions 41 corresponding to the light-transmitting region 21 are arranged at intervals at least along the scanning length direction. That is, within the light-transmitting region 21, the plurality of photoelectric conversion regions 41 can be arranged along the scanning length direction (e.g. Figure 3 The photoelectric conversion regions 41 are arranged at intervals (in the Z direction) so that the adjacent areas of the two photoelectric conversion regions 41 are not blocked, thereby increasing the photosensitive area of ​​the photoelectric conversion region 41, preventing crosstalk, and obtaining a larger pixel effective area, thereby improving the pixel efficiency of the detector module 10.

[0059] Combination Figure 3 , Figure 5 and Figure 6 As shown, optionally, the scanning length direction is the Z direction of the CT device 50 , and a plurality of photoelectric conversion regions 41 are arranged at intervals along the Z direction of the CT device 50 to improve the conversion effect.

[0060] For example, a human body lying flat on a scanning bed of a CT device 50 is used as an example. The height direction of the human body corresponds to the Z direction of the CT device 50. The left-right direction of the human body corresponds to the X direction of the CT device 50. Along the height direction of the human body, the structure changes slightly within a certain length range. In the left-right direction of the human body, the structure changes greatly.

[0061] In this example, during the CT scan, X-rays passing through the human body will cause scattering, and the anti-scatter module 20 is used to filter out stray scattered rays. The scattering corresponds to the distribution of human body structures. There are relatively more stray scattered rays in the X direction, and relatively fewer stray scattered rays in the Z direction. By arranging multiple photodiode pixels at intervals along the scanning length direction (Z direction) of the light-transmitting area 21, the gap between the photodiode pixels in the Z direction is optimized, and the effective output of the photodiode array is improved.

[0062] Combination Figures 1 to 5 As shown, in some embodiments, the number of the multiple photoelectric conversion regions 41 corresponding to the light-transmitting region 21 distributed in the scanning length direction is 2 to 8.

[0063] In this embodiment, the number of multiple photoelectric conversion regions 41 corresponding to the light-transmitting region 21 distributed in the scanning length direction is 2 to 8, that is, in the scanning length direction, the number of photoelectric conversion regions 41 located within the light-transmitting region 21 is 2 to 8, so as to achieve a balance between filtering out the scattering effect and improving pixel efficiency.

[0064] Optionally, the number of the multiple photoelectric conversion regions 41 corresponding to the light-transmitting region 21 distributed in the scanning length direction is 2, 3, 4, 5, 6, 7 or 8 to achieve a balance between filtering out the scattering effect and improving pixel efficiency.

[0065] Combination Figures 1 to 5 As shown, in some embodiments, the anti-scattering module 20 includes a plurality of partition walls 22. The plurality of partition walls 22 are arranged horizontally and vertically to separate a plurality of light-transmitting regions 21. The thickness of the partition wall 22 is smaller than the width of the gap between two adjacent photoelectric conversion regions 41 corresponding to the partition wall 22.

[0066] In this embodiment, the anti-scatter module 20 includes a plurality of partition walls 22, which are arranged horizontally and vertically to separate a plurality of light-transmitting areas 21. The plurality of partition walls 22 separate the plurality of light-transmitting areas 21 to achieve the anti-scatter function of the anti-scatter module 20. For example, Figure 3 and Figure 5 As shown, a plurality of partition walls 22 arranged in the transverse direction (X direction) and a plurality of partition walls 22 arranged in the longitudinal direction (Z direction) are arranged crosswise to separate a plurality of light-transmitting areas 21. It can be understood that the distribution density of the partition walls 22 of the anti-scattering module 20 is not limited, and it can be achieved that one light-transmitting area 21 can correspond to different numbers of scintillator pixels and photoelectric conversion areas 41.

[0067] In this embodiment, the thickness of the partition wall 22 (eg Figure 1 e) is smaller than the width of the gap between two adjacent photoelectric conversion regions 41 corresponding to the partition wall 22 (e.g. Figure 1 d) to prevent the partition wall 22 from blocking the photoelectric conversion region 41, thereby improving the conversion efficiency.

[0068] Combination Figure 1 , Figure 3 and Figure 5 As shown, in some embodiments, the thickness of the partition wall 22 is greater than the width of the gap between two adjacent photoelectric conversion regions 41 within the light-transmitting region 21 .

[0069] In this embodiment, the thickness of the partition wall 22 (eg Figure 1 e) is greater than the width of the gap between two adjacent photoelectric conversion regions 41 located within the light-transmitting region 21 (e.g. Figure 1 c) to improve the conversion efficiency of the photoelectric conversion region 41 to visible light.

[0070] Combination Figure 1 , Figure 3 and Figure 5 As shown, optionally, the width of the gap between two adjacent photoelectric conversion regions 41 located within the light-transmitting region 21 is smaller than the width of the gap between two adjacent photoelectric conversion regions 41 corresponding to the partition wall 22 .

[0071] In this embodiment, the width of the gap between two adjacent photoelectric conversion regions 41 corresponding to the partition wall 22 (eg Figure 1 d), that is, the width of the gap between two adjacent photoelectric conversion regions 41 located directly below the partition wall 22 (e.g. Figure 1 d), that is, the width of the gap between two adjacent photoelectric conversion regions 41 in two adjacent light-transmitting regions 21 (e.g. Figure 1 (d)

[0072] In this embodiment, the width of the gap between two adjacent photoelectric conversion regions 41 located within the light-transmitting region 21 (eg Figure 1 c) is smaller than the width of the gap between two adjacent photoelectric conversion regions 41 corresponding to the partition wall 22 (eg Figure 1 d), it is possible to reduce the width of the gap between two adjacent photoelectric conversion regions 41 located within the light-transmitting region 21 (e.g. Figure 1 c) in order to improve the conversion efficiency of visible light.

[0073] Combination Figures 1 to 5 As shown, in some embodiments, the detector module 10 further includes a light conversion module 30 having a plurality of light conversion regions 31. The light conversion module 30 is disposed between the anti-scattering module 20 and the photoelectric conversion module 40. The plurality of light conversion regions 31 correspond to the plurality of photoelectric conversion regions 41 one by one.

[0074] In this embodiment, the light conversion module 30 has multiple light conversion areas 31, that is, the light conversion module 30 has multiple light conversion areas 31, and the light conversion module 30 is used to convert rays passing through the light-transmitting area 21 into visible light, for example, converting X-rays into visible light.

[0075] In this embodiment, the optical conversion module 30 is disposed between the anti-scatter module 20 and the photoelectric conversion module 40 , so that the X-rays are converted into visible light by the optical conversion module 30 , and then the visible light is converted into a current signal by the photoelectric conversion module 40 .

[0076] In this embodiment, the plurality of light conversion regions 31 correspond to the plurality of photoelectric conversion regions 41 one by one, so as to realize the conversion of visible light into current signals.

[0077] Combination Figures 1 to 5 As shown, optionally, each light-transmitting area 21 corresponds to a plurality of light-converting areas 31 .

[0078] In this embodiment, each light-transmitting area 21 corresponds to a plurality of light conversion areas 31 , so that within each light-transmitting area 21 , adjacent areas of two light conversion areas 31 are not blocked, thereby improving the pixel efficiency of the detector module 10 .

[0079] Combination Figures 1 to 5 As shown, optionally, a plurality of light conversion areas 31 corresponding to the light transmission area 21 are arranged at intervals at least along the scanning length direction.

[0080] In this embodiment, the plurality of light conversion areas 31 corresponding to the light transmission area 21 are arranged at intervals at least along the scanning length direction. That is, within the light transmission area 21, the plurality of light conversion areas 31 can be arranged along the scanning length direction (such as Figure 3 The light conversion regions 31 are arranged at intervals in the Z direction to increase the effective area of ​​the light conversion region 31 and improve the pixel efficiency.

[0081] Combination Figure 1 , Figure 3 and Figure 5 As shown, in some embodiments, the area of ​​the light conversion region 31 is larger than the area of ​​the corresponding photoelectric conversion region 41. The projection of the light conversion region 31 on the plane where the photoelectric conversion region 41 is located covers the photoelectric conversion region 41.

[0082] In this embodiment, the area of ​​the light conversion zone 31 is larger than the area of ​​the corresponding photoelectric conversion zone 41. The projection of the light conversion zone 31 on the plane where the photoelectric conversion zone 41 is located covers the photoelectric conversion zone 41, so that the effective area of ​​the light conversion zone 31 can be larger than the effective photosensitive area of ​​the corresponding photoelectric conversion zone 41, which helps to improve the overall pixel efficiency of the detector module 10.

[0083] In some embodiments, anti-reflection materials are filled between the plurality of light conversion regions 31 .

[0084] In this embodiment, anti-reflection material is filled between multiple light conversion areas 31, that is, anti-reflection material is filled in the gap (GAP) between two adjacent light conversion areas 31 (for example, scintillator pixels), so that this area cannot convert X-rays into visible light, thereby improving the overall conversion efficiency of the detector module 10.

[0085] It is understood that the specific type of anti-reflection material is not limited, for example, titanium dioxide powder mixed with epoxy resin, or magnesium oxide, etc.

[0086] Combination Figures 1 to 5 As shown, optionally, the width of the gap between two adjacent light conversion areas 31 located within the light transmission area 21 is smaller than the width of the gap between two adjacent light conversion areas 31 corresponding to the partition wall 22 .

[0087] In this embodiment, combined with Figure 1 , Figure 3 and Figure 5 As shown, the width of the gap between two adjacent light conversion areas 31 corresponding to the partition wall 22 (eg Figure 1 b), that is, the width of the gap between two adjacent light conversion areas 31 located directly below the partition wall 22 (eg Figure 1 b). The width of the gap between two adjacent light conversion areas 31 located within the light transmission area 21 (e.g. Figure 1 a) is smaller than the width of the gap between two adjacent light conversion areas 31 corresponding to the partition wall 22 (eg Figure 1 b), it is possible to reduce or prevent the light conversion area 31 located directly below the partition wall 22 from being blocked, and to reduce the width of the gap between two adjacent light conversion areas 31 located within the light-transmitting area 21 (e.g. Figure 1 a) in order to improve the conversion efficiency of X-rays.

[0088] Combination Figure 1 , Figure 3 and Figure 5 As shown, optionally, the width of the gap between two adjacent light conversion areas 31 located within the light transmission area 21 (eg Figure 1 a) is smaller than the width of the gap between two adjacent photoelectric conversion regions 41 located within the light-transmitting region 21 (e.g. Figure 1 (c).

[0089] In this embodiment, the width of the gap between two adjacent light conversion areas 31 located within the light transmission area 21 (eg Figure 1 a) is smaller than the width of the gap between two adjacent photoelectric conversion regions 41 located within the light-transmitting region 21 (e.g. Figure 1 In step c), the effective area of ​​the light conversion region 31 is made larger than the effective photosensitive area of ​​the photoelectric conversion region 41 , so as to improve the overall pixel efficiency of the detector module 10 .

[0090] Optionally, the anti-scatter module 20 may adopt a grating having a plurality of grating holes, and the grating holes may serve as the light-transmitting areas 21 to absorb scattered X-rays.

[0091] Optionally, the light conversion module 30 may adopt a scintillator array, the scintillator array has a plurality of scintillator pixels, and the scintillator pixels may serve as the light conversion area 31. Each grating hole corresponds to a plurality of scintillator pixels.

[0092] In this embodiment, the scintillator array is used to convert X-rays passing through the scanned object into visible light. Each grating hole corresponds to a plurality of scintillator pixels, thereby improving the pixel efficiency of the detector module 10.

[0093] Exemplarily, the conversion efficiency of X-rays is explained by taking the anti-scattering module 20 using a grating and grating holes as the light-transmitting area 21, and the light conversion module 30 using a scintillator array and scintillator pixels as the light conversion area 31 as an example. In actual application, it is difficult to make the partition wall 22 too thin. For example, the thickness of the partition wall 22 is 0.1 mm. When the area of ​​the scintillator pixel is small (for example, the area of ​​the scintillator pixel is less than 1 mm×1 mm), the conversion efficiency of X-rays is improved by having each grating hole correspond to a plurality of scintillator pixels, and the width (a) of the gap between two adjacent scintillator pixels within the grating hole range is smaller than the width (b) of the gap between two adjacent scintillator pixels directly below the partition wall 22.

[0094] In this example, each grating hole corresponds to a plurality of scintillator pixels, which can reduce the width (a) of the gap between two adjacent scintillator pixels within the same grating hole, thereby improving the conversion efficiency of the scintillator array to X-rays.

[0095] Optionally, the grating is made of a high X-ray attenuation material to achieve anti-scattering.

[0096] It is understandable that the specific type of high X-ray attenuation material is not limited, such as tungsten, molybdenum, etc.

[0097] It is understandable that there is no limitation on the production process of the grating, for example, a 3D printing process can be used.

[0098] Exemplarily, the photoelectric conversion module 40 adopts a photodiode array, and the photodiode pixel is used as the photoelectric conversion area 41 as an example to illustrate the conversion efficiency of visible light. In actual application, it is difficult to make the partition wall 22 too thin. For example, the thickness of the partition wall 22 is 0.1 mm. The width (c) of the gap between two adjacent photodiode pixels within the grating hole range is smaller than the width (d) of the gap between two adjacent photodiode pixels directly below the partition wall 22, which can not only achieve scattering absorption, but also optimize the width (c) of the gap between two adjacent photodiode pixels within the grating hole range, increase the photosensitive area of ​​the photodiode pixel, thereby improving the conversion efficiency of visible light and improving the pixel efficiency of the detector module 10.

[0099] It should be noted that the gap (GAP) between two photodiode pixels is a non-photosensitive area or an area with poor photosensitivity. By reducing the width (c) of the gap between two adjacent photodiode pixels within the grating aperture, the conversion efficiency of the photodiode array to visible light can be improved.

[0100] For example, Figure 3As shown, along the Z direction of the CT device, one light-transmitting area 21 is provided with two light-conversion areas 31 and two photoelectric conversion areas 41. The effective area of ​​the adjacent areas of the two light-conversion areas 31 and the effective area of ​​the adjacent areas of the two photoelectric conversion areas 41 are not blocked by the side walls, and the width (a) of the gap between the two light-conversion areas 31 within the light-transmitting area 21 and the width (c) of the gap between the two photoelectric conversion areas 41 within the light-transmitting area 21 can be reduced, thereby improving the pixel efficiency of the detector module 10.

[0101] For example, Figure 5 As shown, along the Z direction of the CT device, one light-transmitting area 21 is provided with four light conversion areas 31 and four photoelectric conversion areas 41. Among the four light conversion areas 31, the effective area of ​​the adjacent area between two adjacent light conversion areas 31 will not be blocked by the side wall. Among the four photoelectric conversion areas 41, the effective area of ​​the adjacent area between two adjacent photoelectric conversion areas 41 will not be blocked by the side wall. In addition, the width (a) of the gap between two adjacent light conversion areas 31 within the light-transmitting area 21 can be reduced, and the width (c) of the gap between two adjacent photoelectric conversion areas 41 within the light-transmitting area 21 can be reduced, so that a larger pixel effective area can be obtained, thereby improving the pixel efficiency of the overall detector module 10.

[0102] The embodiment of the present disclosure further provides a CT detector 51. The CT detector 51 comprises a plurality of detector modules 10 as in any of the above embodiments. The plurality of detector modules 10 are spliced ​​at least in the scanning length direction.

[0103] In this embodiment, the CT detector 51 includes a plurality of detector modules 10 as in any of the previous embodiments, and the plurality of detector modules 10 are spliced ​​at least in the scanning length direction to improve pixel efficiency.

[0104] Combination Figure 6 As shown, the embodiment of the present disclosure further provides a CT device 50. The CT device 50 includes a CT detector 51 as in any of the previous embodiments, and the CT detector 51 is used to receive rays that pass through the scanned object.

[0105] In this embodiment, the CT device 50 includes a CT detector 51 as in any of the previous embodiments. The CT detector 51 is used to receive rays that pass through the scanned object, so as to first convert the rays that pass through the scanned object into visible light, and then convert the visible light into a current signal.

[0106] Combination Figure 6 As shown, optionally, the CT device 50 further includes a tube 52. The tube 52 is used to emit radiation to the scanned object.

[0107] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A detector module, characterized in that: include: An anti-scattering module having a plurality of light-transmitting regions and a photoelectric conversion module having a plurality of photoelectric conversion regions arranged at intervals; each light-transmitting region corresponds to a plurality of photoelectric conversion regions; The width of the gap between two adjacent photoelectric conversion regions within the light-transmitting region is smaller than the width of the gap between two adjacent photoelectric conversion regions in two adjacent light-transmitting regions.

2. The detector module according to claim 1, characterized in that: A plurality of photoelectric conversion regions corresponding to the light-transmitting regions are arranged at intervals at least along the scanning length direction.

3. The detector module according to claim 2, characterized in that: The number of the plurality of photoelectric conversion regions corresponding to the light-transmitting region distributed in the scanning length direction is 2 to 8.

4. The detector module according to claim 1, characterized in that: The anti-scattering module includes a plurality of partition walls, which are arranged crosswise in a horizontal and vertical direction to separate a plurality of light-transmitting areas; The thickness of the partition wall is smaller than the width of a gap between two adjacent photoelectric conversion regions corresponding to the partition wall.

5. The detector module according to claim 4, characterized in that: The thickness of the partition wall is greater than the width of a gap between two adjacent photoelectric conversion regions within the light-transmitting region.

6. The detector module according to any one of claims 1 to 5, characterized in that: Also includes: The light conversion module with multiple light conversion areas is arranged between the anti-scattering module and the photoelectric conversion module, and the multiple light conversion areas correspond to the multiple photoelectric conversion areas one by one.

7. The detector module according to claim 6, characterized in that: The area of ​​the light conversion region is larger than the area of ​​the corresponding photoelectric conversion region, and the projection of the light conversion region on the plane where the photoelectric conversion region is located covers the photoelectric conversion region.

8. The detector module according to claim 6, characterized in that: Anti-reflection materials are filled between the plurality of light conversion regions.

9. A CT detector, characterized in that: include: A plurality of detector modules according to any one of claims 1 to 8, wherein the plurality of detector modules are spliced ​​at least in a scanning length direction.

10. A CT device, characterized in that: include: The CT detector according to claim 9 is used to receive radiation transmitted through a scanned object.

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