Alignment Device and Alignment Method for CT Detector Crystal Module and Posterior Collimator

Abstract

The present invention discloses an alignment device and an alignment method for a CT detector crystal module and a post-collimator, including: a first alignment structure, on which an alignment groove is provided, the bottom surface of the alignment groove is set as a first horizontal reference plane, and a first vertical reference plane and a second vertical reference plane are arranged on the inner side of the alignment groove; a locking component, arranged on the first alignment structure; a first adjustment and fixation structure, arranged on the first alignment structure; a second alignment structure, the lower end of the second alignment structure is provided with a second horizontal reference plane; a second adjustment and fixation structure, arranged on the second alignment structure; a third adjustment and fixation structure, arranged on the first alignment structure; a pressing component, the pressing component includes a pressing end, and the pressing end is located above the first horizontal reference plane. The present invention solves the problem in the related art that it is difficult to ensure the angular and positional relationship between the post-collimator and the CT detector crystal, resulting in the deviation of the post-collimator grid from the corresponding pixels.

Description

Technical Field

[0001] The present invention relates to the technical field of CT equipment, and more specifically, to an alignment device and alignment method for a CT detector crystal module and a post-collimator. Background Technique

[0002] With the development of CT towards a wider field of view, the number of detector rows has gradually increased. The increase in the number of detector rows is achieved by splicing multiple detector modules in the Z direction. As the number of CT rows increases, higher requirements are also put forward for the design of the post-collimator. In addition to the anti-scattering grid design in the X direction, the need for shielding of scattered rays in the Z direction has also increased. The traditional 1D structure grid of the post-collimator has gradually been replaced by a 2D structure. In the 2D structure, usually each grid is aligned with one pixel of the detector.

[0003] For high-row detectors such as 128 rows and 256 rows, the processing and assembly of the post-collimator have become technical difficulties. Assembling each independent post-collimator to each detector crystal module by bonding and then splicing is a relatively optimal solution at present. Since the reconstruction of CT images depends on a specific optical path geometry, the alignment accuracy between the post-collimator and the detector crystal has an important impact on the imaging quality of CT. Therefore, it is of great significance to improve the assembly and positioning accuracy of the detector post-collimator and the detector crystal module.

[0004] In the prior art, with the help of an optical recognition device, the detector crystal module and the post-collimator are fitted by the center alignment method. During the fitting process, there will be a situation of twisting around the center, which is difficult to ensure the angular and positional relationship between the post-collimator and the CT detector crystal, resulting in the post-collimator grid deviating from the corresponding pixel. As a result, after the detector module is installed in the CT whole machine, the image appears offset or artifacts, affecting the image quality. Summary of the Invention

[0005] The main object of the present invention is to provide an alignment device for a CT detector crystal module and a post-collimator to solve the problem in the related technology that it is difficult to ensure the angular and positional relationship between the post-collimator and the CT detector crystal during the alignment and installation of the detector crystal module and the post-collimator, resulting in the post-collimator grid deviating from the corresponding pixel.

[0006] To achieve the above object, the present invention provides an alignment device for a CT detector crystal module and a post-collimator, including:

[0007] A first alignment structure, on which an alignment groove is provided. The alignment groove is used to accommodate the post-collimator and the detector crystal. The bottom surface of the alignment groove is set as a first horizontal reference plane, and mutually perpendicular first vertical reference plane and second vertical reference plane are provided on the inner side of the alignment groove;

[0008] A locking component is provided on the first alignment structure and is used to press and fit the rear collimator against the first vertical reference plane and the second vertical reference plane;

[0009] A first adjustment and fixing structure is provided on the first alignment structure and is used to adjust the position of the detector crystal relative to the rear collimator in the horizontal direction;

[0010] A second alignment structure, the lower end of the second alignment structure is provided with a second horizontal reference plane, the second horizontal reference plane is located above the first horizontal reference plane, the second alignment structure is used to install the detector crystal mounting block, and the second horizontal reference plane is used to fit against the upper surface of the detector crystal mounting block;

[0011] A second adjustment and fixing structure is provided on the second alignment structure and is used to adjust the levelness between the upper surface of the detector crystal and the second horizontal reference plane;

[0012] A third adjustment and fixing structure is provided on the first alignment structure and is used to adjust the position of the detector crystal mounting block relative to the detector crystal in the horizontal direction;

[0013] A pressing component, the pressing component includes a pressing end, the pressing end is located above the first horizontal reference plane, and the pressing end is configured to apply a downward pressure to the collimator, the detector crystal and the second alignment structure;

[0014] A glue injection port is provided on the first alignment structure and communicates with the alignment groove.

[0015] Furthermore, the first alignment structure includes a base, a first L-shaped alignment block and a second L-shaped alignment block;

[0016] The first L-shaped alignment block and the second L-shaped alignment block are fixedly provided on the upper surface of the base, and the first side of the first L-shaped alignment block is adjacent to the second side of the second L-shaped alignment block, and the second side of the first L-shaped alignment block is adjacent to the first side of the second L-shaped alignment block;

[0017] The alignment groove is a groove formed by the base, the first L-shaped alignment block and the second L-shaped alignment block, the first horizontal reference plane is located on the upper surface of the base, and the first vertical reference plane and the second vertical reference plane are respectively the two inner side surfaces of the first L-shaped alignment block.

[0018] Furthermore, the locking component includes:

[0019] A first locking member is provided on the second L-shaped alignment block and is opposite to the first vertical reference plane, and is used to press and fit the rear collimator against the first vertical reference plane;

[0020] The second locking member is disposed on the second L-shaped alignment block and is opposite to the second vertical reference plane, and is used to press and fit the posterior collimator on the second vertical reference plane.

[0021] Furthermore, the first adjustment and fixing structure includes at least two first precision micro heads and at least two first adjustment screws. The two first precision micro heads are respectively disposed on the first side and the second side of the first L-shaped alignment block;

[0022] The two first adjustment screws are respectively disposed on the first side and the second side of the second L-shaped alignment block;

[0023] The third adjustment and fixing structure includes at least two third precision micro heads and at least two third adjustment screws. The two third precision micro heads are respectively disposed on the first side and the second side of the first L-shaped alignment block;

[0024] The two third adjustment screws are respectively disposed on the first side and the second side of the second L-shaped alignment block.

[0025] Furthermore, the second alignment structure includes a mounting block reference bottom plate. The lower surface of the mounting block reference bottom plate is provided with the second horizontal reference plane. A fixing member is disposed on the mounting block reference bottom plate, and the fixing member is used to fix the detector crystal mounting block.

[0026] Furthermore, the second adjustment and fixing structure includes at least four second precision micro heads. The four second precision micro heads are respectively disposed at the four corners of the mounting block reference bottom plate. The top ends of the second precision micro heads pass through the mounting block reference bottom plate and are used to abut against the upper surface of the detector crystal.

[0027] Furthermore, the pressing component includes;

[0028] Brackets, two of the brackets are provided and fixed on both sides of the base;

[0029] A cross bar, both ends of the cross bar are fixedly connected to the upper ends of the brackets on both sides;

[0030] An adjusting rod, the adjusting rod is threadedly connected to the cross bar, and the lower end of the adjusting rod passes through the cross bar;

[0031] A compression spring is fixedly disposed at the lower end of the adjusting rod, and the compression spring is set as the lower pressing end.

[0032] Furthermore, the adjusting rod is disposed in the middle of the cross bar and corresponds to the center of the alignment groove.

[0033] Furthermore, the glue injection port includes a first injection port, a second injection port and a third injection port;

[0034] The first injection port is provided on the base, the second injection port is provided on the first L-shaped alignment block, and the third injection port is provided on the second L-shaped alignment block.

[0035] According to another aspect of the present application, a method for aligning a CT detector crystal module and a post collimator is provided. Using the above alignment device, the method includes the following steps:

[0036] Place the post collimator into the alignment groove of the first alignment structure, adjust the pressing component so that the pressing end presses tightly on the post collimator, and make the post collimator closely adhere to the first horizontal reference plane;

[0037] Adjust the locking component to press and fit the post collimator tightly against the first vertical reference plane and the second vertical reference plane;

[0038] Adjust the pressing component to separate the pressing end from the post collimator, place the detector crystal into the alignment groove and install it on the upper surface of the post collimator;

[0039] Adjust the pressing component to make the pressing end press tightly on the detector crystal;

[0040] Adjust the position of the detector crystal relative to the post collimator in the horizontal direction through the first adjustment and fixation structure, so that the detector crystal and the post collimator meet the alignment requirements, and fix the detector crystal;

[0041] Adjust the pressing component to separate the pressing end from the detector crystal, fix the detector crystal mounting block on the second alignment structure, and make the lower surface of the detector crystal mounting block parallel to the second horizontal reference plane;

[0042] Install the second alignment structure above the detector crystal, and adjust the distance between the second horizontal reference plane and the upper surface of the detector crystal through the second adjustment and fixation structure, so that the parallelism between the second horizontal reference plane and the upper surface of the detector crystal meets the alignment requirements;

[0043] Adjust the pressing component to make the pressing end press tightly on the second alignment structure;

[0044] Adjust the position of the detector crystal mounting block relative to the detector crystal in the horizontal direction through the third adjustment and fixation structure, so that the detector crystal mounting block and the detector crystal meet the alignment requirements, and fix the detector crystal mounting block;

[0045] Inject glue through the injection port into the bonding surface between the post collimator and the detector crystal, and inject glue through the injection port into the bonding surface between the detector crystal and the detector crystal mounting block.

[0046] In the embodiment of the present invention, the collimator is positioned first by using the first horizontal reference plane, the first vertical reference plane and the second vertical reference plane during installation. Then, the relative position between the detector crystal and the rear collimator in the horizontal direction is adjusted by using the first adjustment and fixing structure. Finally, the detector crystal mounting block is installed at the set position by using the second alignment structure. The detector crystal mounting block is aligned under the action of the second adjustment and fixing structure and the third adjustment and fixing structure. Finally, the bonding surface is injected with glue through the glue injection port to complete the alignment and bonding, thereby achieving the purpose of effectively adjusting the parallelism and horizontal position of the rear collimator, the detector crystal and the detector crystal mounting block, ensuring the angular accuracy of the CT detector crystal, effectively improving the position accuracy of the rear collimator and the detector crystal, reducing the mounting error, and thus providing sufficient position and angular accuracy for image reconstruction, which is beneficial to improving the image quality. Furthermore, it solves the problem in the related art that it is difficult to ensure the angular and positional relationship between the rear collimator and the CT detector crystal during the alignment and installation of the detector crystal module and the rear collimator, resulting in the deviation of the rear collimator grid from the corresponding pixels. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention, making other features, objectives and advantages of the present invention more obvious. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0048] Figure 1 is an exploded structural schematic diagram of the alignment device according to the embodiment of the present invention;

[0049] Figure 2 is an assembled structural schematic diagram of the alignment device according to the embodiment of the present invention;

[0050] Figure 3 is a structural schematic diagram of the alignment device from another perspective after assembly according to the embodiment of the present invention;

[0051] Figure 4 is a structural schematic diagram of the second alignment structure according to the embodiment of the present invention;

[0052] Figure 5 is a structural schematic diagram of the first L-shaped alignment block and the second L-shaped alignment block according to the embodiment of the present invention;

[0053] Figure 6 is a structural schematic diagram of the base according to the embodiment of the present invention;

[0054] Among them, 1 is the first alignment structure, 10 is the base, 2 is the locking component, 20 is the second locking member, 21 is the first locking member, 11 is the first L-shaped alignment block, 12 is the second L-shaped alignment block, 13 is the alignment groove, 130 is the second vertical reference plane, 131 is the first vertical reference plane, 132 is the first horizontal reference plane, 3 is the rear collimator, 4 is the detector crystal, 5 is the detector crystal mounting block, 6 is the second alignment structure, 60 is the second horizontal reference plane, 61 is the mounting block reference base plate, 7 is the second adjustment and fixing structure, 70 is the second precision differential head, 8 is the pressing component, 80 is the pressing end, 81 is the bracket, 82 is the cross bar, 83 is the adjusting rod, 84 is the compression spring, 90 is the first adjustment and fixing structure, 901 is the first adjustment screw, 902 is the first precision differential head, 91 is the third adjustment and fixing structure, 911 is the third precision differential head, 910 is the third adjustment screw, 15 is the second injection port, 16 is the third injection port, 17 is the first injection port. Detailed implementation manners

[0055] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of the present invention here.

[0057] In the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation.

[0058] Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0059] In addition, terms such as "arranged", "provided with", "connected", "fixed", etc. 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 an internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In addition, the meaning of the term "plurality" should be two or more.

[0061] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0062] To solve the related technical problems, such as Figures 1 to 4 As shown, an alignment device for a CT detector crystal module and a post-collimator according to an embodiment of the present invention includes:

[0063] A first alignment structure 1, on which an alignment groove 13 is provided. The alignment groove 13 is used to accommodate the post-collimator 3 and the detector crystal 4. The bottom surface of the alignment groove 13 is set as a first horizontal reference plane 132, and mutually perpendicular first vertical reference plane 131 and second vertical reference plane 130 are arranged inside the alignment groove 13;

[0064] A locking assembly 2, arranged on the first alignment structure 1, for pressing and fitting the post-collimator 3 against the first vertical reference plane 131 and the second vertical reference plane 130;

[0065] A first adjustment and fixation structure 90, arranged on the first alignment structure 1, for adjusting the position of the detector crystal 4 relative to the post-collimator 3 in the horizontal direction;

[0066] A second alignment structure 6, the lower end of which is provided with a second horizontal reference plane 60. The second horizontal reference plane 60 is located above the first horizontal reference plane 132. The second alignment structure 6 is used to install the detector crystal mounting block 5, and the second horizontal reference plane 60 is used to fit against the upper surface of the detector crystal mounting block 5;

[0067] A second adjustment and fixation structure 7, arranged on the second alignment structure 6, for adjusting the levelness between the upper surface of the detector crystal 4 and the second horizontal reference plane 60;

[0068] A third adjustment and fixation structure 91, arranged on the first alignment structure 1, for adjusting the position of the detector crystal mounting block 5 relative to the detector crystal 4 in the horizontal direction;

[0069] The pressing assembly 8, the pressing assembly 8 includes a lower pressing end, the lower pressing end is located above the first horizontal reference plane 132, and the lower pressing end is configured to be able to apply a downward pressure to the collimator, the detector crystal 4 and the second alignment structure 6;

[0070] The glue injection port is provided on the first alignment structure 1 and communicates with the alignment groove 13.

[0071] In this embodiment, the detector crystal 4 module includes the detector crystal 4 and the detector crystal mounting block 5. During the alignment and installation process with the rear collimator 3, it is necessary to accurately align the rear collimator 3 and the detector crystal 4, and at the same time accurately align the detector crystal 4 and the detector crystal mounting block 5.

[0072] For the alignment and installation of the rear collimator 3 and the detector crystal 4, in this embodiment, it is achieved through the first alignment structure 1, the locking assembly 2 and the first adjustment and fixing structure 90. Specifically, an alignment groove 13 is formed on the first alignment structure 1, and the upper end of the alignment groove 13 is of an open structure. The rear collimator 3 can be inserted into the alignment groove 13 through this open structure. A first horizontal reference plane 132 is provided on the bottom surface of the alignment groove 13. The first horizontal reference plane 132 is a pre-processed reference plane, and its levelness meets the requirements. When the rear collimator 3 is inserted into the alignment groove 13, the lower surface of the rear collimator 3 is in contact with the first horizontal reference plane 132, so that the levelness of the rear collimator 3 meets the requirements.

[0073] On this basis, in order to make the position of the rear collimator 3 on the horizontal plane meet the requirements, in this embodiment, the adjacent inner side surfaces of the alignment groove 13 are respectively set as the first vertical reference plane 131 and the second vertical reference plane 130. In the world coordinate system, the first vertical reference plane 131 extends along the X direction, and the second vertical reference plane 130 extends along the Z direction. The rear collimator 3 located in the alignment groove 13 can be pressed against the first vertical reference plane 131 and the second vertical reference plane 130 under the action of the locking assembly 2, so that the levelness and the horizontal position of the rear collimator 3 are both in the set position. Since it is necessary to make two adjacent side surfaces of the rear collimator 3 respectively abut against the first vertical reference plane 131 and the second vertical reference plane 130, the locking assembly 2 needs to apply a thrust to the rear collimator 3 in the corresponding direction. In this embodiment, the locking assembly 2 can be set to two and respectively correspond to the first vertical reference plane 131 and the second vertical reference plane 130.

[0074] After the position of the rear collimator 3 is determined, the detector crystal 4 can be inserted into the alignment groove 13 and placed on the upper surface of the rear collimator 3. It should be noted that the pressing assembly 8 needs to be removed before installing the detector crystal 4 to make room for the installation of the detector crystal 4.

[0075] Since the levelness of the rear collimator 3 meets the requirements, when the detector crystal 4 is placed on the upper surface of the rear collimator 3, the levelness of the detector crystal 4 also meets the requirements accordingly. On this basis, to facilitate adjusting the horizontal position of the detector crystal 4 while maintaining this levelness, the alignment device in this embodiment further includes a pressing component 8, and the pressing end of the pressing component 8 can apply a downward pressure to the detector crystal 4 to make it closely fit on the upper surface of the rear collimator 3. In one implementation manner of the pressing component 8, the pressing component 8 can be an elastic structure, and it can apply a downward pressure to the detector crystal 4 by using its elastic force. In another implementation manner of the pressing component 8, the pressing component 8 can be a structure capable of linear movement in the vertical direction (such as a screw, a lead screw, etc.), and it applies a downward pressure to the detector crystal 4 through vertical movement.

[0076] After the levelness of the detector crystal 4 is determined, it is also necessary to adjust the horizontal position of the detector crystal 4 to align it with the rear collimator 3. In this embodiment, the horizontal position of the detector crystal 4 is adjusted by the first adjustment and fixation structure 90, that is, its position relative to the rear collimator 3 in the horizontal direction. In one implementation manner, the first adjustment and fixation structure 90 includes two adjustment members oppositely arranged in the X direction and two adjustment members oppositely arranged in the Z direction. The position of the detector crystal 4 in the horizontal direction is adjusted through the combined action of the four adjustment members, so that the detector crystal 4 is aligned.

[0077] After the detector crystal 4 is aligned, it is necessary to align the detector crystal mounting block 5. In this embodiment, the alignment of the detector crystal mounting block 5 is achieved through the second alignment structure 6, the second adjustment and fixation structure 7, and the third adjustment and fixation structure 91. Specifically, in this embodiment, the lower end of the second alignment structure 6 is pre-processed with a second horizontal reference plane 60 that meets the levelness requirements. The detector crystal mounting block 5 is pre-mounted on the second alignment structure 6, and the upper surface of the detector crystal mounting block 5 is closely attached to the second horizontal reference plane 60. At this time, both the upper surface and the lower surface of the detector crystal mounting block 5 are parallel to the second horizontal reference plane 60.

[0078] Since the detector crystal 4 needs to be bonded to the lower surface of the detector crystal mounting block 5, after the detector crystal mounting block 5 is installed, a certain spacing needs to be maintained between it and the detector crystal 4, and this spacing is used to fill the UV glue. At the same time, it is also necessary to make the levelness and horizontal position between the lower surface of the detector crystal mounting block 5 and the detector crystal 4 meet the specified alignment requirements. In other words, it is necessary to make the levelness of the second horizontal reference plane 60 and the upper surface of the detector crystal 4 meet the specified alignment requirements, and the horizontal positions of the detector crystal mounting block 5 and the detector crystal 4 meet the specified alignment requirements.

[0079] It should be noted that after the alignment of the detector crystal 4 is completed, the pressing and bonding assembly 8 needs to be removed to create the installation space for the second alignment structure 6.

[0080] For making the level meet the alignment requirements, in this embodiment, it is achieved through the second adjustment and fixing structure 7. Specifically, the second adjustment and fixing structure 7 is installed on the second alignment structure 6, and it can play a role in adjusting the distance between the second horizontal reference plane 60 and the upper surface of the detector crystal 4 at various positions. When the distances at various positions are the same, the level of the two can meet the requirements, and at the same time, the size of this distance can also be adjusted to meet the requirements of glue injection and bonding. After the level meets the regulations, a downward pressure can be applied to the second alignment structure 6 through the downward pressing end of the pressing and bonding assembly 8 to maintain the level of the detector crystal mounting block 5.

[0081] For making the horizontal position meet the alignment requirements, in this embodiment, it is achieved through the third adjustment and fixing structure 91. Specifically, the third adjustment and fixing structure 91 is installed on the first alignment structure 1, and it can play a role in adjusting the horizontal position of the detector crystal mounting block 5. In this embodiment, the third adjustment and fixing structure 91 can be arranged with reference to the first adjustment and fixing structure 90, and the two may only have differences in the arrangement positions. This embodiment will not elaborate on it here.

[0082] So far, the post collimator 3, the detector crystal 4, and the detector crystal mounting block 5 are completed with alignment. After the alignment is completed, bonding of the three is required, that is, glue needs to be injected into the corresponding bonding surfaces. For this reason, the alignment device in this embodiment further includes a glue injection port, and the position of the glue injection port corresponds to the corresponding bonding surface. Through the glue injection port, UV glue can be injected into the bonding surface, and after injection, UV irradiation can be carried out for fixation.

[0083] To facilitate injecting glue into the bonding surface through the gap of the post collimator 3, the entire alignment device can be inverted so that the first alignment structure 1 is located at the upper part, and a corresponding glue injection port is opened on the first alignment structure 1.

[0084] In this embodiment, the collimator 3 is first positioned by using the first horizontal reference plane 132, the first vertical reference plane 131 and the second vertical reference plane 130 during installation. Then, the relative position between the detector crystal 4 and the rear collimator 3 in the horizontal direction is adjusted by using the first adjustment and fixing structure 90. Finally, the detector crystal mounting block 5 is installed at the set position by using the second alignment structure 6. The detector crystal mounting block 5 is aligned under the action of the second adjustment and fixing structure 7 and the third adjustment and fixing structure 91. Finally, the bonding surface is injected with glue through the glue injection port to complete the alignment and bonding, thus achieving the purpose of effectively adjusting the parallelism and horizontal position of the rear collimator 3, the detector crystal 4 and the detector crystal mounting block 5, ensuring the angle accuracy of the CT detector crystal 4, effectively improving the position accuracy of the rear collimator 3 and the detector crystal 4, reducing the mounting error, and providing sufficient position and angle accuracy for image reconstruction, which is beneficial to improving the image quality. Furthermore, it solves the problem that it is difficult to ensure the angle and position relationship between the rear collimator 3 and the CT detector crystal 4 during the alignment and installation of the detector crystal 4 module and the rear collimator 3 in the related art, resulting in the grid of the rear collimator 3 deviating from the corresponding pixels.

[0085] For the rectangular rear collimator 3, the alignment groove 13 is correspondingly set to be rectangular. Specifically, the alignment groove 13 can be formed by enclosing a complete frame structure. Since the first vertical reference plane 131 and the second vertical reference plane 130 need to be formed in the alignment groove 13, when a complete frame structure is adopted, the processing difficulty of the first vertical reference plane 131 and the second vertical reference plane 130 is large. Therefore, the alignment groove 13 in this embodiment is composed of two L-shaped alignment blocks and a base 10.

[0086] Specifically, as Figure 1 、 Figure 5 and Figure 6 shown, the first alignment structure 1 in this embodiment includes a base 10, a first L-shaped alignment block 11 and a second L-shaped alignment block 12;

[0087] The first L-shaped alignment block 11 and the second L-shaped alignment block 12 are fixed on the upper surface of the base 10, and the first side of the first L-shaped alignment block 11 is adjacent to the second side of the second L-shaped alignment block 12, and the second side of the first L-shaped alignment block 11 is adjacent to the first side of the second L-shaped alignment block 12;

[0088] The alignment groove 13 is a groove body surrounded by the base 10, the first L-shaped alignment block 11 and the second L-shaped alignment block 12. The first horizontal reference plane 132 is located on the upper surface of the base 10, and the first vertical reference plane 131 and the second vertical reference plane 130 are respectively the two inner side surfaces of the first L-shaped alignment block 11.

[0089] In this embodiment, the first L-shaped alignment block 11 and the second L-shaped alignment block 12 are arranged opposite to each other, thus forming a rectangular frame structure. The first L-shaped alignment block 11 and the second L-shaped alignment block 12 are fixed on the base 10, thus jointly enclosing an alignment groove 13. The surface of the base 10 located within the alignment groove 13 is the first horizontal reference plane 132, and the two inner side surfaces of the first L-shaped alignment block 11 are the first vertical reference plane 131 and the second vertical reference plane 130 respectively. The locking assembly 2 can be installed on the second L-shaped alignment block 12 to fix the rear collimator 3.

[0090] In one embodiment of the locking assembly 2, as Figure 2 shown, the locking assembly 2 includes:

[0091] A first locking member 21, which is arranged on the second L-shaped alignment block 12 and is opposite to the first vertical reference plane 131, and is used to press the rear collimator 3 against the first vertical reference plane 131;

[0092] A second locking member 20, which is arranged on the second L-shaped alignment block 12 and is opposite to the second vertical reference plane 130, and is used to press the rear collimator 3 against the second vertical reference plane 130.

[0093] Specifically, in this embodiment, the first locking member 21 can be a locking screw threadedly connected to the first side of the second L-shaped alignment block 12, and the second locking member 20 can be a locking screw threadedly connected to the second side of the second L-shaped alignment block 12. After installing the rear collimator 3, the rear collimator 3 can be pressed against the first vertical reference plane 131 and the second vertical reference plane 130 by screwing the locking screws.

[0094] To facilitate accurately adjusting the horizontal position of the detector crystal 4, as Figures 1 to 3 shown, in this embodiment, the first adjustment and fixation structure 90 includes at least two first precision micrometer heads 902 and at least two first adjustment screws 901. The two first precision micrometer heads 902 are respectively arranged on the first side and the second side of the first L-shaped alignment block 11; the two first adjustment screws 901 are respectively arranged on the first side and the second side of the second L-shaped alignment block 12.

[0095] Specifically, after installing the detector crystal 4 and fixing the detector crystal 4 through the pressing assembly 8, taking the horizontal position of the rear collimator 3 as a reference, the horizontal position of the detector crystal 4 can be adjusted by the first precision micrometer head 902 and the first adjustment screw 901, so that the detector crystal 4 and the rear collimator 3 are aligned.

[0096] Similarly, the third adjustment and fixation structure 91 includes at least two third precision micrometers 911 and at least two third adjustment screws 910. The two third precision micrometers 911 are respectively arranged on the first side and the second side of the first L-shaped alignment block 11; the two third adjustment screws 910 are respectively arranged on the first side and the second side of the second L-shaped alignment block 12.

[0097] After installing the detector crystal mounting block 5 and fixing the detector crystal mounting block 5 through the pressing assembly 8, taking the horizontal position of the detector crystal 4 as a reference, the horizontal position of the detector crystal mounting block 5 can be adjusted by the third precision micrometer 911 and the third adjustment screw 910, so that the detector crystal mounting block 5 and the detector crystal 4 are aligned in the horizontal direction.

[0098] In an embodiment of the second alignment structure 6, as Figure 1 and Figure 4 shown, the second alignment structure 6 includes a mounting block reference base plate 61. A second horizontal reference plane 60 is provided on the lower surface of the mounting block reference base plate 61, and a fixing member is provided on the mounting block reference base plate 61 for fixing the detector crystal mounting block 5.

[0099] Specifically, in this embodiment, the mounting block reference base plate 61 is generally a plate-like structure with a flat surface, and the second horizontal reference plane 60 is pre-machined on the lower surface of the mounting block reference base plate 61. The detector crystal mounting block 5 can be fixed to the second horizontal reference plane 60 of the mounting block reference base plate 61 through a fixing member, and the fixing member can be a fixing screw or the like.

[0100] On the basis of the above embodiment, to facilitate the adjustment of the level of the detector crystal mounting block 5, the second adjustment and fixation structure 7 in this embodiment includes at least four second precision micrometers 70. The four second precision micrometers 70 are respectively arranged at the four corners of the mounting block reference base plate 61, and the top ends of the second precision micrometers 70 pass through the mounting block reference base plate 61 and are used to abut against the upper surface of the detector crystal 4.

[0101] Specifically, the lower end of the second precision micrometer 70 passes through the mounting block reference base plate 61. After the detector crystal mounting block 5 is fixed to the mounting block reference base plate 61, the mounting block reference base plate 61 can be mounted on the upper end of the detector crystal 4. At this time, the lower end of the second precision micrometer 70 abuts against the upper end of the detector crystal 4. By adjusting the four second precision micrometers 70, the distance and parallelism between the second horizontal reference plane 60 and the upper end surface of the detector crystal 4 can be adjusted.

[0102] In this embodiment, the precision micrometer has an adjustment accuracy of the micron level, which can meet the precise adjustment of the positional relationship.

[0103] In an embodiment of the pressing assembly 8, as Figure 1 andFigure 2 As shown, the pressing assembly 8 includes: a bracket 81, with two brackets 81 arranged and fixed on both sides of the base 10; a cross bar 82, with both ends of the cross bar 82 fixedly connected to the upper ends of the brackets 81 on both sides; an adjusting rod 83, threadedly connected to the cross bar 82, and the lower end of the adjusting rod 83 passing through the cross bar 82; a compression spring 84, fixedly arranged at the lower end of the adjusting rod 83, and the compression spring 84 being set as the downward pressing end.

[0104] Specifically, in this embodiment, the two brackets 81 are vertically fixed on both sides of the base 10, and both ends of the cross bar 82 are fixed to the brackets 81 on both sides by screws, and the cross bar 82 can be installed and disassembled by screws. The adjusting rod 83 is threadedly connected to the middle of the cross bar 82, and the compression spring 84 is fixed to the lower end of the adjusting rod 83. With the compression spring 84 as the downward pressing end of the pressing assembly 8, the downward pressure applied by the compression spring 84 can be adjusted by turning the adjusting rod 83. After using the compression spring 84 as the downward pressing end, it can avoid rigid contact with the device and damage the device. Further, the adjusting rod 83 is arranged in the middle of the cross bar 82 and corresponds to the center of the alignment groove 13.

[0105] In this embodiment, the function of the compression spring 84 can, on the one hand, make the rear collimator 3 fully contact the first horizontal reference surface 132 and maintain the stability of the reference surface, and on the other hand, can support the rear collimator 3 and the detector crystal 4 in the vertical direction when injecting glue into the rear collimator 3.

[0106] Since it is necessary to bond the rear collimator 3 and the detector crystal 4, as well as the detector crystal 4 and the detector crystal mounting block 5, therefore as Figure 5 and Figure 6 shown, the glue injection ports in this embodiment include a first glue injection port 17, a second glue injection port 15, and a third glue injection port 16; the first glue injection port 17 is arranged on the base 10, the second glue injection port 15 is arranged on the first L-shaped alignment block 11, and the third glue injection port 16 is arranged on the second L-shaped alignment block 12.

[0107] Specifically, in this embodiment, the first glue injection port 17 is located on the base 10, and after inverting the entire alignment device, glue can be injected through the first glue injection port 17 into the bonding surface between the rear collimator 3 and the detector crystal 4. At the same time, glue can also be injected through the second glue injection port 15 and the third glue injection port 16 into the bonding surface between the detector crystal 4 and the detector crystal mounting block 5.

[0108] According to another aspect of the present application, a method for aligning and bonding a CT detector crystal 4 module and a rear collimator 3 is provided. Using the above alignment device, it includes the following steps:

[0109] Place the rear collimator 3 into the alignment groove 13 of the first alignment structure 1, adjust the pressing assembly 8 so that the downward pressing end presses tightly on the rear collimator 3, and make the rear collimator 3 closely adhere to the first horizontal reference surface 132;

[0110] Adjust the locking assembly 2 to press and fit the rear collimator 3 against the first vertical reference surface 131 and the second vertical reference surface 130;

[0111] Adjust the pressing assembly 8 to disengage the lower pressing end from the rear collimator 3, place the detector crystal 4 into the alignment groove 13 and install it on the upper surface of the rear collimator 3;

[0112] Adjust the pressing assembly 8 to press the lower pressing end against the detector crystal 4;

[0113] Adjust the position of the detector crystal 4 relative to the rear collimator 3 in the horizontal direction through the first adjustment and fixation structure 90 to make the detector crystal 4 and the rear collimator 3 meet the alignment requirements, and fix the detector crystal 4;

[0114] Adjust the pressing assembly 8 to disengage the lower pressing end from the detector crystal 4, fix the detector crystal mounting block 5 on the second alignment structure 6, and make the lower surface of the detector crystal mounting block 5 parallel to the second horizontal reference surface 60;

[0115] Install the second alignment structure 6 above the detector crystal 4, and adjust the distance between the second horizontal reference surface 60 and the upper surface of the detector crystal 4 through the second adjustment and fixation structure 7 to make the parallelism between the second horizontal reference surface 60 and the upper surface of the detector crystal 4 meet the alignment requirements;

[0116] Adjust the pressing assembly 8 to press the lower pressing end against the second alignment structure 6;

[0117] Adjust the position of the detector crystal mounting block 5 relative to the detector crystal 4 in the horizontal direction through the third adjustment and fixation structure 91 to make the detector crystal mounting block 5 and the detector crystal 4 meet the alignment requirements, and fix the detector crystal mounting block 5;

[0118] Inject glue through the glue injection port into the joint surface between the rear collimator 3 and the detector crystal 4, and inject glue through the glue injection port into the joint surface between the detector crystal 4 and the detector crystal mounting block 5.

[0119] In this embodiment, the collimator 3 is positioned first by using the first horizontal reference plane 132, the first vertical reference plane 131 and the second vertical reference plane 130 during installation, then the relative position of the detector crystal 4 and the posterior collimator 3 in the horizontal direction is adjusted by using the first adjustment and fixing structure 90. Finally, the detector crystal mounting block 5 is mounted to the set position by using the second alignment structure 6. The detector crystal mounting block 5 is aligned under the action of the second adjustment and fixing structure 7 and the third adjustment and fixing structure 91. Finally, the bonding surface is injected with glue through the glue injection port to complete the purpose of alignment and bonding, thereby effectively adjusting the parallelism and horizontal position of the posterior collimator 3, the detector crystal 4 and the detector crystal mounting block 5, ensuring the angular accuracy of the CT detector crystal 4, effectively improving the position accuracy of the posterior collimator 3 and the detector crystal 4, reducing the mounting error, thus providing sufficient position and angular accuracy for image reconstruction, which is beneficial to improving the image quality. Furthermore, it solves the problem in the related art that when aligning and installing the detector crystal 4 module and the posterior collimator 3, it is difficult to ensure the angular and positional relationship between the posterior collimator 3 and the CT detector crystal 4, resulting in the grid of the posterior collimator 3 deviating from the corresponding pixels.

[0120] On the basis of the above embodiment, the glue injection port includes a first injection port 17, a second injection port 15 and a third injection port 16; the first injection port 17 is arranged on the base 10, the second injection port 15 is arranged on the first L-shaped alignment block 11, and the third injection port 16 is arranged on the second L-shaped alignment block 12. When the alignment of the posterior collimator 3, the detector crystal 4 and the detector crystal mounting block 5 is completed, the entire alignment device can be inverted. Then, UV glue is first injected into the bonding surface between the posterior collimator 3 and the detector crystal 4 through the first injection port 17 on the base 10, and at the same time, UV glue is injected into the bonding surface between the detector crystal 4 and the detector crystal mounting block 5 through the second injection port 15 and the third injection port 16, and pre-fixed by UV irradiation. Then, the alignment device can be removed. At this time, the posterior collimator 3, the detector crystal 4 and the detector crystal mounting block 5 are fixed under the action of the UV glue, and the glue injection operation can be performed again and completely fixed after drying.

[0121] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for aligning a CT detector crystal module with a posterior collimator, characterized in that Comprising: A first alignment structure, on which an alignment groove is provided, the alignment groove is used to accommodate a rear collimator and a detector crystal, the bottom surface of the alignment groove is set as a first horizontal reference plane, and a first vertical reference plane and a second vertical reference plane perpendicular to each other are provided on the inner side of the alignment groove; A locking assembly, arranged on the first alignment structure, for pressing and fitting the rear collimator against the first vertical reference plane and the second vertical reference plane; A first adjustment and fixation structure, arranged on the first alignment structure, for adjusting the position of the detector crystal relative to the rear collimator in the horizontal direction; A second alignment structure, the lower end of the second alignment structure is provided with a second horizontal reference plane, the second horizontal reference plane is located above the first horizontal reference plane, the second alignment structure is used to install a detector crystal mounting block, and the second horizontal reference plane is used to fit against the upper surface of the detector crystal mounting block; A second adjustment and fixation structure, arranged on the second alignment structure, for adjusting the levelness between the upper surface of the detector crystal and the second horizontal reference plane; A third adjustment and fixation structure, arranged on the first alignment structure, for adjusting the position of the detector crystal mounting block relative to the detector crystal in the horizontal direction; A pressing assembly, the pressing assembly includes a pressing end, the pressing end is located above the first horizontal reference plane, and the pressing end is set to be able to apply a downward pressure to the collimator, the detector crystal and the second alignment structure; A glue injection port, arranged on the first alignment structure and communicated with the alignment groove.

2. The alignment device according to claim 1, wherein The first alignment structure includes a base, a first L-shaped alignment block and a second L-shaped alignment block; The first L-shaped alignment block and the second L-shaped alignment block are fixedly arranged on the upper surface of the base, and the first side of the first L-shaped alignment block is adjacent to the second side of the second L-shaped alignment block, and the second side of the first L-shaped alignment block is adjacent to the first side of the second L-shaped alignment block; The alignment groove is a groove body surrounded by the base, the first L-shaped alignment block and the second L-shaped alignment block, the first horizontal reference plane is located on the upper surface of the base, and the first vertical reference plane and the second vertical reference plane are respectively the two inner side surfaces of the first L-shaped alignment block.

3. The alignment device according to claim 2, wherein The locking assembly includes: A first locking member, arranged on the second L-shaped alignment block and opposite to the first vertical reference plane, for pressing and fitting the rear collimator against the first vertical reference plane; A second locking member, arranged on the second L-shaped alignment block and opposite to the second vertical reference plane, for pressing and fitting the rear collimator against the second vertical reference plane.

4. The alignment device according to claim 2, characterized in that, The first adjustment and fixation structure includes at least two first precision differential heads and at least two first adjustment screws, and the two first precision differential heads are respectively arranged on the first side and the second side of the first L-shaped alignment block; The two first adjustment screws are respectively arranged on the first side and the second side of the second L-shaped alignment block; The third adjustment and fixation structure includes at least two third precision differential heads and at least two third adjustment screws, and the two third precision differential heads are respectively arranged on the first side and the second side of the first L-shaped alignment block; The two third adjusting screws are respectively arranged on the first side and the second side of the second L-shaped alignment block.

5. The alignment device according to claim 1, characterized in that, The second alignment structure includes a mounting block reference base plate, a second horizontal reference plane is arranged on the lower surface of the mounting block reference base plate, and a fixing member is arranged on the mounting block reference base plate, and the fixing member is used for fixing the detector crystal mounting block.

6. The alignment device according to claim 5, wherein The second adjusting and fixing structure includes at least four second precision micro heads, and the four second precision micro heads are respectively arranged at the four corners of the mounting block reference base plate. The top end of the second precision micro head passes through the mounting block reference base plate and is used to abut against the upper surface of the detector crystal.

7. The alignment device according to claim 2, characterized in that The pressing assembly includes; Brackets, two brackets are provided and fixed on both sides of the base; A cross bar, both ends of the cross bar are fixedly connected to the upper ends of the brackets on both sides; An adjusting rod, the adjusting rod is threadedly connected to the cross bar, and the lower end of the adjusting rod passes through the cross bar; A compression spring is fixedly arranged at the lower end of the adjusting rod, and the compression spring is set as the pressing end.

8. The alignment device according to claim 7, wherein The adjusting rod is arranged in the middle of the cross bar and corresponds to the center of the alignment groove.

9. The alignment device according to claim 2, wherein The glue injection port includes a first injection port, a second injection port and a third injection port; The first injection port is arranged on the base, the second injection port is arranged on the first L-shaped alignment block, and the third injection port is arranged on the second L-shaped alignment block.

10. A method for aligning a CT detector crystal module with a posterior collimator, characterized in that, Using the alignment device according to any one of claims 1 to 9, the following steps are included: Place the rear collimator into the alignment groove of the first alignment structure, adjust the pressing assembly so that the pressing end presses tightly on the rear collimator, and make the rear collimator closely adhere to the first horizontal reference plane; Adjust the locking assembly to press and fit the rear collimator tightly on the first vertical reference plane and the second vertical reference plane; Adjust the pressing assembly to make the pressing end disengage from the rear collimator, place the detector crystal into the alignment groove and install it on the upper surface of the rear collimator; Adjust the pressing assembly to make the pressing end press tightly on the detector crystal; Adjust the position of the detector crystal relative to the rear collimator in the horizontal direction through the first adjusting and fixing structure, so that the detector crystal and the rear collimator meet the alignment requirements, and fix the detector crystal; Adjust the pressing assembly to make the pressing end disengage from the detector crystal, fix the detector crystal mounting block on the second alignment structure, and make the lower surface of the detector crystal mounting block parallel to the second horizontal reference plane; Install the second alignment structure above the detector crystal, and adjust the distance between the second horizontal reference plane and the upper surface of the detector crystal through the second adjusting and fixing structure, so that the parallelism between the second horizontal reference plane and the upper surface of the detector crystal meets the alignment requirements; Adjust the pressing assembly to make the pressing end press tightly on the second alignment structure; Adjust the position of the detector crystal mounting block relative to the detector crystal in the horizontal direction through the third adjusting and fixing structure, so that the detector crystal mounting block and the detector crystal meet the alignment requirements, and fix the detector crystal mounting block; Inject glue through the glue injection port to the joint surface between the rear collimator and the detector crystal, and inject glue through the glue injection port to the joint surface between the detector crystal and the detector crystal mounting block.

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