Scalable collimator and SPECT device

Abstract

This application discloses a retractable collimator and a SPECT device. The retractable collimator includes: a fixed base; a driving member disposed at the end of the fixed base; a transmission assembly, the end of which is fixed to the driving member and located within the fixed base; a telescopic arm, fixed to the transmission assembly and slidably connected to the fixed base, the transmission assembly being located on the lower side of the telescopic arm; and a collimator detection assembly disposed at the head end of the telescopic arm. When the driving member is activated, the transmission assembly drives the extension or retraction of the telescopic arm. This application solves the technical problem that the lack of a telescopic function in the collimator makes it unable to adapt to different collimator requirements in different scenarios.

Description

Technical Field

[0001] This application relates to the field of SPECT products, and more specifically, to a retractable collimator and a SPECT device. Background Technology

[0002] A collimator is an optical element used for input and output in fiber optic communication devices. In the medical field, collimators are often used in conjunction with SPECT (single-photon emission computed tomography) or CT products.

[0003] Patent application number CN202011122916.6 discloses a collimator for CT scans, specifically comprising a fixed protective assembly, a filtering assembly, and a slicing assembly. The filtering and slicing assemblies are mounted on the fixed protective assembly, and the X-rays emitted from the X-ray source pass through the filtering and slicing assemblies before reaching the scanning area. The new collimator provided by this invention has a compact structure and relatively small space in the Y-direction, facilitating an increase in the scanning aperture and providing feasible conditions for large-aperture CT scans.

[0004] However, the collimator does not have a telescopic function, and cannot adapt to the different requirements of the collimator in different scenarios.

[0005] There is currently no effective solution to the problem that the collimator in related technologies does not have a telescopic function, which makes it unable to adapt to different collimator requirements in different scenarios. Summary of the Invention

[0006] The main purpose of this application is to provide a retractable collimator and a SPECT device to solve the problem that the collimator does not have a retractable function and therefore cannot adapt to different requirements of the collimator in different scenarios.

[0007] To achieve the above objectives, according to one aspect of this application, a retractable collimator is provided.

[0008] The retractable collimator according to this application includes: a fixed base; a driving member disposed at the end of the fixed base; a transmission assembly, the end of which is fixed to the driving member and located within the fixed base; a telescopic arm, which is fixed to the transmission assembly and slidably connected to the fixed base, the transmission assembly being located on the lower side of the telescopic arm; and a collimator detection assembly disposed at the head end of the telescopic arm; when the driving member is activated, the transmission assembly drives the telescopic arm to extend or retract.

[0009] Furthermore, the driving component includes: a motor, and a reducer connected to the motor; the transmission assembly includes: a lead screw connected to the reducer, and a threaded cylinder driven by the lead screw, the threaded cylinder being fixed on the telescopic arm.

[0010] Furthermore, the collimator detection assembly includes: a set of first probes, a first encoder, and a first motor disposed in the probe seat at the head end of the telescopic arm, wherein the first probes are connected to the first motor, and the first encoder is disposed on the first motor.

[0011] Furthermore, the collimator detection assembly includes: two sets of first probes, a first encoder, and a first motor disposed in the probe seat at the head end of the telescopic arm, wherein the first probes are connected to the first motor, and the first encoder is disposed on the first motor.

[0012] Furthermore, it also includes: an auxiliary collimator assembly slidably disposed on the upper side of the telescopic arm, wherein a limiting boss is provided under the housing of the auxiliary collimator assembly, and the limiting boss is slidably connected to a limiting groove disposed on the upper side of the telescopic arm; the auxiliary collimator assembly includes at least: a housing, and a set of second probes, a second encoder, and a second motor disposed within the housing, wherein the second probes and the second motor are connected, and the second encoder is disposed on the second motor. The second motor is used to drive the second probes to rotate, and the second encoder is used to monitor the rotation angle of the second probes.

[0013] Furthermore, the auxiliary collimator assembly also includes: a gear, a third motor, and a third encoder disposed within the housing, the third encoder being disposed on the third motor, the third motor being connected to the gear, and the gear meshing with a rack disposed in the rack groove of the telescopic arm.

[0014] Furthermore, a cable chain placement groove is provided on the lower side of the telescopic arm. A first cable chain for connecting the first wire harness is arranged in the cable chain placement groove. The groove opening of the cable chain placement groove has a first limiting groove, and a first telescopic cover and a second telescopic cover are arranged on the first limiting groove. One end of the first cable chain is connected to the auxiliary collimator assembly. The tail end of the first telescopic cover is connected to the tail end of the cable chain placement groove, and the head end of the second telescopic cover is connected to the tail end of the cable chain placement groove. The head end of the first telescopic cover and the tail end of the second telescopic cover are in contact and connected to the auxiliary collimator assembly. A second cable chain for connecting the second wire harness is also arranged in the cable chain placement groove. The second cable chain is connected to the collimator detection assembly and is located below the first cable chain. A third telescopic cover is also provided on the right side of the second cable chain.

[0015] Furthermore, the fixing seat includes: a cavity for accommodating the transmission assembly, the cavity being enclosed by four side walls to form a structure open at the top and end; and a support plate located below the cable chain placement slot; the left side wall and the right side wall of the four side walls are respectively provided with a left limiting groove and a right limiting groove, and the telescopic arm is provided with a left limiting protrusion and a right limiting protrusion that match and connect with the left limiting groove and the right limiting groove.

[0016] To achieve the above objectives, according to another aspect of this application, a SPECT device is provided.

[0017] The SPECT device according to this application includes: a main frame, a main rotating device disposed on the main frame, an outer cover fixed on the front and rear sides of the main rotating device, and further includes: the aforementioned telescopic collimator, the end of which is fixed to the inner side of the annulus of the main rotating device; and a support frame, which is fixed to the telescopic collimator near the front end.

[0018] Furthermore, there are multiple retractable collimators, and the ends of the multiple retractable collimators are fixed to the inner side of the main rotating device with equal circumferential arcs via corner pieces.

[0019] In this embodiment, a telescopic collimator is used. A fixed base and a telescopic drive are located at the end of the fixed base. A transmission assembly is fixed at its end to the telescopic drive and located within the fixed base. A telescopic arm is fixed to the transmission assembly and slidably connected to the fixed base, with the transmission assembly located on the lower side of the telescopic arm. A collimator detection assembly is located at the head end of the telescopic arm. This achieves the purpose of extending or retracting the telescopic arm via the transmission assembly when the telescopic drive is activated. This achieves the technical effect of adapting to different collimator requirements in different scenarios through telescopic movement, thereby solving the technical problem of being unable to adapt to different collimator requirements in different scenarios due to the lack of telescopic functionality in the collimator. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0021] Figure 1 This is one of the structural schematic diagrams of a retractable collimator according to an embodiment of this application;

[0022] Figure 2 This is a second schematic diagram of the retractable collimator according to an embodiment of this application;

[0023] Figure 3 This is the third structural schematic diagram of the retractable collimator according to an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the housing of the auxiliary collimator assembly according to an embodiment of this application;

[0025] Figure 5This is a structural schematic diagram of the fixing base according to an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the telescopic arm according to an embodiment of this application;

[0027] Figure 7 This is one of the structural schematic diagrams of a SPECT device according to an embodiment of this application;

[0028] Figure 8 This is a second schematic diagram of the SPECT device according to an embodiment of this application.

[0029] Figure Labels

[0030] 1. Fixed base; 2. Telescopic drive component; 3. Transmission assembly; 4. Telescopic arm; 5. Collimator detection assembly; 6. Auxiliary collimator assembly; 7. First cable chain; 8. Second cable chain; 11. Cavity; 12. Side wall; 12A. Left limiting groove; 12B. Right limiting groove; 13. Support plate; 21. Telescopic motor; 22. Reducer; 31. Lead screw; 32. Threaded cylinder; 41. Probe seat; 42. Limiting groove; 43. Rack groove; 43A. Left limiting protrusion; 43B. Right limiting protrusion ; 44. Rack; 45. Cable chain placement slot; 46. First telescopic cover; 47. Second telescopic cover; 48. Third telescopic cover; 49. First limiting slot; 51. First probe; 52. First encoder; 53. First motor; 61. Housing; 62. Limiting boss; 63. Gear; 64. Second motor; 65. Third encoder; 100. Telescopic collimator; 200. Main frame; 300. Main rotary device; 400. Outer cover; 500. Support frame; 600. Corner piece. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0034] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0035] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] like Figure 1-6As shown, this application relates to a retractable collimator 100, which includes: a fixed base 1; a driving member disposed at the end of the fixed base 1; a transmission assembly 3, the end of which is fixed to the driving member and located inside the fixed base 1; a telescopic arm 4, which is fixed to the transmission assembly 3 and slidably connected to the fixed base 1, the transmission assembly 3 being located on the lower side of the telescopic arm 4; and a collimator detection assembly 5 disposed at the head end of the telescopic arm 4; when the driving member is activated, the transmission assembly 3 drives the telescopic arm 4 to extend or retract.

[0038] Specifically, the fixed base 1 serves to fix the driving component and the transmission assembly 3. In this embodiment, the driving component is fixed to the end of the fixed base 1 and passes through the fixed base 1 to connect with the transmission assembly 3 arranged inside the fixed base 1, so as to ensure the normal transmission of driving force. The driving component is used to provide driving force; the transmission assembly 3 is used to transmit the driving force to the telescopic arm 4; the telescopic arm 4 is used to perform telescopic movement under force; the collimator detection assembly 5 is used to detect the detection part; preferably, the driving component includes: a motor and a reducer 22 connected to the motor; the transmission assembly 3 includes: a lead screw 31 connected to the reducer 22, and a threaded cylinder 32 that is driven by the lead screw 31, and the threaded cylinder 32 is fixed on the telescopic arm 4; when the telescopic motor 21 is powered on, the reducer 22 matches the speed and transmits torque to the lead screw 31, and the lead screw 31 rotates to drive the threaded cylinder 32 to move linearly, and finally the threaded cylinder 32 drives the collimator detection assembly 5 on the telescopic arm 4 to perform linear movement of extension or retraction; the telescopic function of the collimator is realized, and it can adapt to different requirements of the collimator in different scenarios through extension and retraction. Optionally, the driving component is a rotating handle, which is connected to the lead screw 31. By manually rotating the rotating handle, the lead screw 31 can also be driven to rotate, thereby driving the threaded cylinder 32 to move linearly. Finally, the threaded cylinder 32 drives the collimator detection component 5 on the telescopic arm 4 to extend or retract linearly. This also realizes the telescopic function of the collimator, which can adapt to different requirements of the collimator in different scenarios through extension and retraction.

[0039] As can be seen from the above description, this application achieves the following technical effects:

[0040] In this embodiment, a telescopic collimator 100 is used. A fixed base 1 and a driving component are located at the end of the fixed base 1. A transmission assembly 3 is fixed at its end to the driving component and located within the fixed base 1. A telescopic arm 4 is fixed to the transmission assembly 3 and slidably connected to the fixed base 1, with the transmission assembly 3 located below the telescopic arm 4. A collimator detection assembly 5 is located at the head end of the telescopic arm 4. This achieves the purpose of extending or retracting the telescopic arm 4 via the transmission assembly 3 when the driving component is activated. This achieves the technical effect of adapting to different collimator requirements in different scenarios through telescopic movement, thereby solving the technical problem of being unable to adapt to different collimator requirements in different scenarios due to the lack of telescopic functionality in the collimator.

[0041] Preferably, the collimator detection assembly 5 includes: a set of first probes 51, a first encoder 52, and a first motor 53 disposed within the probe seat 41 at the head end of the telescopic arm 4. The first probes 51 and the first motor 53 are connected, and the first encoder 52 is mounted on the first motor 53. The first motor 53 drives the first probes 51 to rotate, and the first encoder 52 monitors the rotation angle of the first probes 51. The probe seat 41 has multiple slots for respectively accommodating the first probes 51, the first encoder 52, and the first motor 53. Through the cooperation of one or two sets of first probes 51, first encoders 52, and first motors 53, the detection function of the collimator can be realized. At the same time, the cooperation of the first motor 53 and the first encoder 52 ensures that the first probes 51 have rotational freedom.

[0042] Preferably, the collimator detection assembly 5 includes: two sets of first probes 51, a first encoder 52, and a first motor 53 disposed within the probe seat 41 at the head end of the telescopic arm 4. The first probes 51 and the first motors 53 are connected, and the first encoders 52 are mounted on the first motors 53. The two sets of first motors 53 can drive the two sets of first probes 51 to rotate, and the two sets of first encoders 52 can monitor the rotation angle of the two sets of first probes 51. The rotation direction of each set of first probes 51 can be the same or opposite. Through the cooperation of one or two sets of first probes 51, first encoders 52, and first motors 53, the detection function of the collimator can be realized.

[0043] Preferably, the device further includes: an auxiliary collimator assembly 6 slidably disposed on the upper side of the telescopic arm 4, wherein a limiting boss 62 is provided under the housing 61 of the auxiliary collimator assembly 6, and the limiting boss 62 is slidably connected to a limiting groove 42 disposed on the lower side of the telescopic arm 4. By moving the auxiliary collimator assembly 6 to a position directly above the probe seat 41 or other non-detection positions, it can adapt to different subjects being tested; specifically, when the auxiliary collimator assembly 6 is moved to a position directly above the probe seat 41, the collimator detection assembly 5 and the auxiliary collimator assembly 6 can be used together to detect heavier subjects; when the auxiliary collimator assembly 6 is moved to a position not directly above the probe seat 41 (other non-detection positions), the collimator detection assembly 5 can be used to detect thinner subjects.

[0044] Preferably, the auxiliary collimator assembly 6 includes at least: a housing 61, and a set of second probes, a second encoder, and a second motor 64 disposed within the housing 61. The second probes and the second motor 64 are connected, and the second encoder is mounted on the second motor 64. The second motor 64 drives the second probes to rotate, and the second encoder monitors the rotation angle of the second probes. The housing 61 of the auxiliary collimator assembly 6 has multiple slots for respectively housing the second probes, the second encoder, and the second motor 64. Through the cooperation of the second probes, the second encoder, and the second motor 64, the detection function of the auxiliary collimator assembly 6 can be realized. At the same time, through the cooperation of the first motor 53 and the first encoder 52, the second probe can be guaranteed to have rotational freedom.

[0045] Preferably, the auxiliary collimator assembly 6 further includes: a gear 63, a third motor, and a third encoder 65 disposed within the housing 61. The third encoder 65 is mounted on the third motor, which is connected to the gear 63. The gear 63 meshes with a rack 44 disposed in the slot 43 of the rack 44 in the telescopic arm 4. The third motor drives the gear 63 to rotate, causing the gear 63 and rack 44 to mesh and move, thereby enabling the auxiliary collimator assembly 6 to reciprocate on the telescopic arm 4. The third encoder 65 monitors the motion parameters of the auxiliary collimator assembly 6 during its reciprocating motion on the telescopic arm 4. The third motor and the third encoder 65 drive the gear 63 to rotate, thereby enabling the auxiliary collimator assembly 6 to move on the telescopic arm 4 through the cooperation of the gear 63 and rack 44, thus ensuring the normal operation of the auxiliary collimator assembly 6.

[0046] Preferably, the lower side of the telescopic arm 4 is further provided with a cable chain placement groove 45, in which a first cable chain 7 for connecting the first wire harness is arranged. The groove opening of the cable chain placement groove 45 has a first limiting groove 49, on which a first telescopic cover 46 and a second telescopic cover 47 are arranged. One end of the first cable chain 7 is connected to the auxiliary collimator assembly 6. The tail end of the first telescopic cover 46 is connected to the tail end of the cable chain placement groove 45, and the head end of the second telescopic cover 47 is connected to the tail end of the cable chain placement groove 45. The head end of the first telescopic cover 46 and the tail end of the second telescopic cover 47 are in contact and connected to the auxiliary collimator assembly 6. A second cable chain 8 for connecting the second wire harness is also arranged in the cable chain placement groove 45. The second cable chain 8 is connected to the collimator detection assembly 5 and is located below the first cable chain 7. A third telescopic cover 48 is also provided on the right side of the second cable chain 8. The first telescopic cover 46 and the second telescopic cover 47 have telescopic functions. When the auxiliary collimator assembly 6 moves along the telescopic arm 4 towards the first probe 51, the first telescopic cover 46 extends and the second telescopic cover 47 shortens. When the auxiliary collimator assembly 6 moves along the telescopic arm 4 towards the motor, the first telescopic cover 46 shortens and the second telescopic cover 47 extends. The first cable chain 7 and the second cable chain 8 are connected to the first wire harness and the second wire harness, so that when the auxiliary collimator assembly 6 and the telescopic arm 4 reciprocate, the first cable chain 7 and the second cable chain 8 reciprocate accordingly, and the first wire harness and the second wire harness are released or wound onto the first cable chain 7 and the second cable chain 8, thus achieving adaptation to different telescopic lengths of the auxiliary collimator assembly 6 and the telescopic arm 4.

[0047] Preferably, the fixed base 1 includes: a cavity 11 for accommodating the transmission assembly 3, the cavity 11 being enclosed by four side walls 12 to form an open structure at the top and end; and a support plate 13 located below the cable chain placement groove 45; the left side wall 12 and the right side wall 12 of the four side walls 12 are respectively provided with a left limiting groove 12A and a right limiting groove 12B, and the telescopic arm 4 is provided with a left limiting protrusion 43A and a right limiting protrusion 43B that match and connect with the left limiting groove 12A and the right limiting groove 12B. The fixed base 1 and the telescopic arm 4 are limited by the cooperation of the left limiting groove 12A, the right limiting groove 12B and the left limiting protrusion 43A, the right limiting protrusion 43B.

[0048] like Figure 7-8As shown, this application relates to a SPECT device, which includes: a main frame 200, a main rotating device 300 disposed on the main frame 200, and an outer cover 400 fixed on the front and rear sides of the main rotating device 300. It also includes: the aforementioned retractable collimator 100, the end of which is fixed to the inner side of the annulus of the main rotating device 300; and a support frame 500 fixed to the retractable collimator 100 near its front end. Preferably, there are multiple retractable collimators 100, and the ends of the multiple retractable collimators 100 are circumferentially and equally arc-shapedly fixed to the inner side of the annulus of the main rotating device 300 by corner pieces 600.

[0049] The SPECT device in this application achieves the same technical effect as the retractable collimator 100. Furthermore, since SPECT (Single Photon Emission Tomography) products typically employ a collimator structure with two collimator modules cantilevered at the front end of the main frame 200 for detection, this structure significantly increases the overall size and weight of the device. To address the increased size caused by the cantilever arrangement of the collimator modules, the ends of multiple retractable collimators 100 are circumferentially fixed to the inner side of the ring of the main rotating device 300 with equal curvature. Then, the positions of the multiple retractable collimators 100 near the front end are circumferentially fixed to the support frame 500 with equal curvature. This circumferential arrangement of the collimators replaces the cantilever arrangement, shortening the overall size in the Z-axis and increasing the detection range and convenience. It should be noted that the support frame 500 and the main rotating device 300 are a small circle and a large circle with the same center.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A retractable collimator, characterized in that, include: Fixed base (1) The driving component (2) is disposed at the end of the fixed base (1); The transmission assembly (3) is fixed at its end to the drive member (2) and is located on the upper side of the fixed base (1); The telescopic arm (4) is fixed to the transmission assembly (3) and slidably connected to the fixed base (1). The transmission assembly (3) is located on the lower side of the telescopic arm (4). The collimator detection assembly (5) is disposed at the head end of the telescopic arm (4); When the drive unit (2) is activated, the telescopic arm (4) is extended or retracted via the transmission assembly (3); An auxiliary collimator assembly (6) is slidably disposed on the upper side of the telescopic arm (4). A limiting boss (62) is provided under the housing (61) of the auxiliary collimator assembly. The limiting boss (62) is slidably connected to a limiting groove (42) disposed on the upper side of the telescopic arm (4). The auxiliary collimator assembly includes at least: a housing (61), and a set of second probes, a second encoder and a second motor disposed in the housing (61). The second probes and the second motor are connected, and the second encoder is disposed on the second motor. The auxiliary collimator assembly further includes: a gear (63), a third motor (64) and a third encoder (65) disposed in the housing (61), the third encoder (65) being disposed on the third motor (64), the third motor (64) being connected to the gear (63), and the gear (63) meshing with the rack (44) disposed in the rack groove (43) of the telescopic arm (4).

2. The retractable collimator according to claim 1, characterized in that, The drive component (2) includes: a motor (21) and a reducer (22) connected to the motor (21); the transmission component (3) includes: a lead screw (31) connected to the reducer (22) and a threaded cylinder (32) connected to the lead screw (31) in a transmission manner, the threaded cylinder (32) being fixed on the telescopic arm (4).

3. The retractable collimator according to claim 1, characterized in that, The collimator detection assembly (5) includes: a set of first probes (51), first encoders (52) and first motors (53) disposed in the probe seat (41) at the head end of the telescopic arm (4). The first probes (51) and the first motors (53) are connected, and the first encoders (52) are disposed on the first motors (53).

4. The retractable collimator according to claim 1, characterized in that, Two sets of first probes (51), first encoders (52) and first motors (53) are installed in the probe seat (41) at the head end of the telescopic arm (4). The first probes (51) and the first motors (53) are connected, and the first encoders (52) are installed on the first motors (53).

5. The retractable collimator according to claim 1, characterized in that, The lower side of the telescopic arm (4) is also provided with a drag chain placement groove (45), in which a first drag chain (7) for connecting the first wire harness is arranged. The groove opening of the drag chain placement groove (45) has a first limiting groove (49), on which a first telescopic cover (46) and a second telescopic cover (47) are arranged. One end of the first drag chain (7) is connected to the auxiliary collimator assembly (6), and the tail end of the first telescopic cover (46) is connected to the tail end of the drag chain placement groove (45). The first end of the second telescopic cover (47) is connected to the tail end of the cable chain placement groove (45). The first end of the first telescopic cover (46) and the tail end of the second telescopic cover (47) are in contact and connected to the auxiliary collimator assembly (6). A second cable chain (8) for connecting the second wire harness is also arranged in the cable chain placement groove (45). The second cable chain (8) is connected to the collimator detection assembly (5) and is located on the lower side of the first cable chain (7). A third telescopic cover (48) is also provided on the right side of the second cable chain (8).

6. The retractable collimator according to claim 5, characterized in that, The fixed base (1) includes: a cavity (11) for accommodating the transmission assembly (3), the cavity (11) being enclosed by four side walls (12) to form a structure with an open top and an open end; and a tray (13) located below the drag chain placement slot; the left side wall and the right side wall of the four side walls are respectively provided with a left limiting groove (12A) and a right limiting groove (12B), and the telescopic arm (4) is provided with a left limiting protrusion (43A) and a right limiting protrusion (43B) that are matched and connected to the left limiting groove (12A) and the right limiting groove (12B).

7. A SPECT device, comprising: The main frame (200), the main rotating device (300) disposed on the main frame (200), and the outer cover (400) fixed on the front and rear sides of the main rotating device (300) are characterized in that they further include: a telescopic collimator (100) according to any one of claims 1 to 6, the end of the telescopic collimator (100) being fixed to the inner side of the annulus of the main rotating device (300); and a support frame (500) fixed on the telescopic collimator (100) near the front end.

8. The SPECT device according to claim 7, characterized in that, The retractable collimator is a plurality of such collimators, and the ends of the plurality of such collimators (100) are fixed circumferentially to the inner side of the main rotating device (300) by corner pieces (600) with equal arc.

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