CN116027564A - Stepless slotting collimator and CT scanning equipment - Google Patents
Stepless slotting collimator and CT scanning equipment Download PDFInfo
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Abstract
The application discloses stepless slit collimator and CT scanning equipment includes: the optical plane is provided with a guide rail along the Z-axis direction, and the middle part of the guide rail is broken to form two coaxial guide rail sections; the parallelogram component comprises two rotary opposite sides and two parallel opposite sides, the middle parts of the rotary opposite sides are hinged with the optical plane through pin shafts, the two ends of the parallel opposite sides are respectively hinged with the corresponding rotary opposite sides, and the parallel opposite sides are provided with sliding grooves along the X-axis direction; the blade is arranged to be distributed along the Z-axis direction and two parallel blades are connected with two parallel opposite sides respectively, a guide rail sliding block and at least two positioning blocks are arranged on the blade, the guide rail sliding blocks of the two blades are respectively connected with the two guide rail sections in a sliding manner, and the positioning blocks of the two blades are respectively connected with the sliding grooves of the two parallel opposite sides in a sliding manner. The method and the device have the technical effects of improving the accuracy of slotting control, reducing errors generated in the control process and greatly reducing the material cost of equipment.
Description
Technical Field
The application relates to the technical field of CT equipment, in particular to a stepless slotting collimator and CT scanning equipment.
Background
The CT system is a scanning device through rotary exposure and data acquisition, and the core principle of the CT system is that the rotary system performs data acquisition with relatively accurate geometry of a scanned object (human body), and then reconstructs the acquired data to obtain an image. During each scan, the CT system adjusts the Z-direction coverage of the exposure radiation field of the system to minimize the patient dose according to the data acquisition requirement. The component of the adjustment system that is covered in the Z-direction by the radiation is called a collimator.
In the XOY plane, the detector is an arc surface with a focus as a center, and two collimator shapes are generally used in the industry to realize the adjustment of the light field coverage, one is a flat collimator parallel to the X axis direction, and the other is an arc surface collimator with a focus as a center and concentric with the detector plane. Because the projection proportion in the X (or detector fan angle) direction is constant, the increment of the collimator opening width is consistent with the stepping amount of the detector surface light field width in the X (or detector fan angle) direction, and the arc collimator has more accurate control effect compared with the flat collimator.
The stepless slotting collimation is a collimation structure with double blades for flexibly controlling the relative position, and the slotting width can be flexibly adjusted according to actual conditions; the fixed slotting structure is characterized in that a plurality of slotting with preset widths are hollowed out on one shielding plate, and the slotting width is adjusted by the integral adjusting device when the fixed slotting structure is used; therefore, the stepless slotting collimation is more beneficial to the guarantee of design precision and the expandability of slotting adjustment.
The design scheme of the arc stepless slotting collimator in the industry adopts the following modes: 1. mounting two arc-shaped collimating blades on a common parallel guide rail; 2. two motors, encoders and lead screws are used to control the movement of the two blades respectively. These current common approaches have several drawbacks and problems:
stress problem of parallel guide rail: the problems of the design, the installation error and the like of the parallel guide rail lead to the problem of driving stress, which can reduce the service life of the motor and influence the control position and the slotting width precision;
double motor encoder, double screw relative error problem: the motor encoder and the screw pitch of the screw are factors influencing the position control precision, the system requires that the motion of the two collimating blades is symmetrical motion, and the two blades respectively use different motor encoders and different screws, so that the symmetry error of the two blades relative to the center of the light plane can be caused;
cost problem: the motor, encoder, lead screw and guide rail are all very important cost-related components, and the cost of the apparatus can be greatly reduced if fewer related components can be used.
Disclosure of Invention
The main objective of the present application is to provide a stepless slit collimator and a CT scanning device, so as to solve the problems that in the related art, the stepless slit collimator has extra stress in the adjustment process due to the design error and the installation error of the parallel guide rail, which can reduce the service life of the motor and affect the control position and slit width precision, and the adoption of the dual-drive device can cause the error of the symmetry of the two blades relative to the center of the light plane, and the cost is high.
In order to achieve the above object, the present application provides a stepless slit collimator comprising:
the device comprises a light plane, wherein a guide rail is arranged on the light plane along the Z-axis direction, the middle part of the guide rail is broken to form two coaxial guide rail sections, and the breaking distance between the two guide rail sections is larger than or equal to the coverage range of rays;
the parallelogram component is arranged on the light plane and comprises two rotary opposite sides and two parallel opposite sides, the middle part of each rotary opposite side is hinged with the light plane through a pin shaft, two ends of each parallel opposite side are respectively hinged with the corresponding rotary opposite side, and the parallel opposite sides are provided with sliding grooves along the X-axis direction;
the blade is arranged to be distributed along the Z-axis direction and two parallel to each other, the two blades are respectively connected with the two parallel opposite sides, guide rail sliding blocks and at least two positioning blocks are arranged on the blade, the guide rail sliding blocks of the two blades are respectively connected with the two guide rail sections in a sliding manner, and the positioning blocks of the two blades are respectively connected with the two sliding grooves of the two parallel opposite sides in a sliding manner.
Further, the device also comprises a driving assembly, wherein the driving assembly is in transmission connection with one of the opposite rotating sides of the pin shaft, and the opposite rotating sides are driven to rotate around the axis of the pin shaft through the driving assembly.
Further, the driving assembly comprises a driving motor and a first encoder, the driving motor is in transmission connection with the first encoder, and the output end of the first encoder is in transmission connection with one of the pin shafts of the opposite rotating sides.
Further, the driving assembly further comprises a transmission shaft, and two ends of the transmission shaft are respectively in transmission connection with the driving motor and the first encoder through a coupler.
Further, the device also comprises a second encoder which is in transmission connection with the pin shaft of the other rotating opposite side and is used for acquiring the rotation data of the rotating opposite side.
Further, the pin shafts are hinged to the light plane, and the pin shafts of the two opposite rotating sides are symmetrical along the central line of the light plane;
the middle part of the rotary opposite side is provided with a pivot pin hole, and the pin shaft penetrates through the pivot pin hole and is fixedly connected with the rotary opposite side, so that the rotary opposite side can rotate around the axis of the rotary positioning pin.
Further, the blades are provided in a flat plate shape or an arc shape.
Further, the guide rail sliding blocks are arranged at least two and distributed along the Z-axis direction, and the two guide rail sliding blocks are both in sliding connection with the corresponding guide rail sections.
Further, the positioning block is arranged in a cylindrical shape or a rectangular shape.
According to another aspect of the present application, there is provided a CT scanning apparatus comprising the stepless slit collimator described above.
In the embodiment of the application, by setting the light plane, a guide rail is arranged on the light plane along the Z-axis direction, the middle part of the guide rail is broken to form two coaxial guide rail sections, and the breaking distance between the two guide rail sections is larger than or equal to the coverage range of rays; the parallelogram component is arranged on the light plane and comprises two rotary opposite sides and two parallel opposite sides, the middle parts of the rotary opposite sides are hinged with the light plane through pin shafts, two ends of the parallel opposite sides are respectively hinged with the corresponding rotary opposite sides, and the parallel opposite sides are provided with sliding grooves along the X-axis direction; the blade is arranged to be distributed along the Z axis direction and two parallel edges are connected with the two parallel edges respectively, the guide rail sliding blocks and at least two positioning blocks are arranged on the blade, the guide rail sliding blocks of the two blades are respectively connected with the two guide rail sections in a sliding way, the positioning blocks of the two blades are respectively connected with the sliding grooves of the two parallel edges in a sliding way, the effect that one rotating edge is driven to rotate by only a single driving device is achieved, the characteristics of the parallelogram are utilized to enable the two parallel edges to keep a parallel state and approach or separate from each other, the other rotating edge is simultaneously enabled to synchronously rotate, in the moving process of the two parallel edges, the two blades are forced to keep parallel and approach or separate from each other along the Z axis direction under the action of the guide rail sections and the sliding grooves, the purpose of adjusting the distance between the two blades is achieved, the accuracy of slotting control is improved, errors generated in the control process are reduced, the technical effect that the material cost of equipment is greatly reduced is caused due to the design errors and installation errors of the parallel guide rails in the related technology is solved, the fact that in the stepless slotting collimator is additionally stressed in the adjusting process, the service life of the motor is reduced, the control position is affected, the width of the blade is controlled, and the two-dimensional accuracy is high compared with the two-dimensional driving device, and the cost is high.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application and to provide a further understanding of the application with regard to the other features, objects and advantages of the application. The drawings of the illustrative embodiments of the present application and their descriptions are for the purpose of illustrating the present application and are not to be construed as unduly limiting the present application. In the drawings:
FIG. 1 is a schematic illustration of an application according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a structure according to an embodiment of the present application;
FIG. 3 is a schematic view of a structure after rotating opposite sides according to an embodiment of the present application;
FIG. 4 is a schematic view of a light plane in accordance with an embodiment of the present application;
FIG. 5 is a schematic view of a parallelogram member according to an embodiment of the present application;
FIG. 6 is a schematic view of a blade according to an embodiment of the present application;
the device comprises a light plane 1, a pin shaft 2, a blade 3, a rotary opposite side 4, a parallel opposite side 6, a guide rail slide block 7, a guide rail section 8, a chute 9, a positioning block 10 and a collimator 11.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein.
In the present application, the terms "upper", "lower", "inner", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "disposed," "configured," "connected," "secured," and the like are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The design scheme of the arc stepless slotting collimator in the industry adopts the following modes: 1. mounting two arc-shaped collimating blades on a common parallel guide rail; 2. two motors, encoders and lead screws are used to control the movement of the two blades respectively. These current common approaches have several drawbacks and problems:
stress problem of parallel guide rail: the problems of the design, the installation error and the like of the parallel guide rail lead to the problem of driving stress, which can reduce the service life of the motor and influence the control position and the slotting width precision;
double motor encoder, double screw relative error problem: the motor encoder and the screw pitch of the screw are factors influencing the position control precision, the system requires that the motion of the two collimating blades is symmetrical motion, and the two blades respectively use different motor encoders and different screws, so that the symmetry error of the two blades relative to the center of the light plane can be caused;
cost problem: the motor, encoder, lead screw and guide rail are all very important cost-related components, and the cost of the apparatus can be greatly reduced if fewer related components can be used.
To this end, as shown in fig. 1 to 3, the embodiment of the present application provides a stepless slit collimator 11 including:
the light plane 1 is provided with a guide rail along the Z-axis direction, the middle part of the guide rail is broken to form two coaxial guide rail sections 8, and the breaking distance between the two guide rail sections 8 is larger than or equal to the coverage range of rays;
the parallelogram component is arranged on the light plane 1 and comprises two rotary opposite sides 4 and two parallel opposite sides 6, the middle part of the rotary opposite sides 4 is hinged with the light plane 1 through a pin shaft 2, two ends of the parallel opposite sides 6 are respectively hinged with the corresponding rotary opposite sides 4, and a chute 9 is formed in the parallel opposite sides 6 along the X-axis direction;
the blades 3 are arranged to be distributed along the Z-axis direction and are parallel, the two blades 3 are respectively connected with the two parallel opposite sides 6, guide rail sliding blocks 7 and at least two positioning blocks 10 are arranged on the blades 3, the guide rail sliding blocks 7 of the two blades 3 are respectively connected with the two guide rail sections 8 in a sliding manner, and the positioning blocks 10 of the two blades 3 are respectively connected with the sliding grooves 9 of the two parallel opposite sides 6 in a sliding manner.
In the present embodiment, the collimator 11 is mainly composed of three parts of the light plane 1, the parallelogram block and the blade 3. As shown in fig. 4, the light plane 1 may be provided as a square sheet-like structure having good light transmission, and rays may be projected through the light plane 1. A guide rail is arranged on one side of the light plane 1 facing the projection plane, the trend of the guide rail is in the Z-axis direction, the guide rail is positioned in the middle of the light plane 1, and the distance between the upper end of the guide rail and the upper end of the light plane 1 is equal to the distance between the lower end of the guide rail and the lower end of the light plane 1. Since the ray needs to pass through the light plane 1, in order to avoid the guide rail shielding the ray, the complete guide rail is divided into an upper part and a lower part in the embodiment, which are respectively a guide rail section 8 positioned at the upper part of the light plane 1 and a guide rail section 8 positioned at the lower part of the light plane 1. Since the guide rails are arranged in the Z-axis direction, the coaxiality between the two guide rail sections 8 formed by the disconnection can be maintained, and there is no offset in both the Y-axis direction and the X-axis direction. The distance between the two guide rail sections 8 needs to be greater than or equal to the ray coverage, preferably greater than the ray coverage, so that the guide rail sections 8 do not block the ray in the whole slotting adjustment process.
As shown in fig. 4, in addition to the guide rail section 8, two pins 2 are arranged on the light plane 1, the two pins 2 are distributed along the X-axis direction, the two pins 2 are symmetrical along the center line of the light plane 1 at the same time, and the pins 2 can be hinged with the light plane 1, so that the pins 2 can be driven to rotate on the light plane 1. In particular, the pin 2 may be hinged to the light plane 1 by means of a bearing or a bushing.
The parallelogram component is a part of a core in the embodiment, and due to the structural characteristics of the parallelogram, when four sides are hinged in sequence, rotation of any side can drive opposite sides to synchronously rotate, and meanwhile adjacent sides can keep a parallel state and translate. When the parallelogram is changed from a rectangular shape to a shape with one pair of inclined edges, the distance between the other pair of edges is reduced, whereas the distance between the other pair of edges is increased. Therefore, the embodiment uses the characteristics of the parallelogram to enable the adjacent sides to be controlled to be capable of changing the distance while keeping parallelism only by driving the opposite sides of one side to rotate.
Specifically, as shown in fig. 2, 3 and 5, in this embodiment, the parallelogram member is composed of two opposite rotating sides 4 and two opposite parallel sides 6, the opposite rotating sides 4 are distributed along the X-axis direction and are fixedly connected with the pins 2 on two sides of the optical plane 1 respectively, and the opposite parallel sides 6 are distributed along the Z-axis direction and are hinged with the adjacent opposite rotating sides 4. When the rotary pair of opposite sides 4 is used, a driving assembly is required to be installed and is in transmission connection with the pin shaft 2 of one of the rotary pair of opposite sides 4, and the rotary pair of opposite sides 4 is driven to rotate around the axis of the pin shaft 2 through the driving assembly.
In this embodiment, only one driving component is needed to drive one of the opposite rotating sides 4 to rotate, so as to control the two parallel opposite sides 6 to keep parallel and translate. In the transformation process of the simple parallelogram, the translation direction of the parallel opposite sides 6 is inclined substantially, and the translation direction can be decomposed into an X-axis direction and a Z-axis direction. In the translation process corresponding to the blade 3, the blade 3 needs to be only translated in the Z-axis direction but not in the X-axis direction, so that the blade 3 cannot be directly connected with the parallel opposite sides 6 simply, and an additional structure is provided to release the driving force of the parallel opposite sides 6 in the X-axis direction generated in the translation process.
For this reason, in this embodiment, a chute 9 is formed on the parallel opposite sides 6, the opening direction of the chute 9 is the X-axis direction, as shown in fig. 6, and at least two positioning blocks 10 are disposed on one side of each blade 3 away from the projection surface. The purpose of the two positioning blocks 10 is to maintain the parallelism of the two blades 3, both positioning blocks 10 being located in the same chute 9 and being linearly slidable along the chute 9, while the blades 3 are also provided with guide rail slides 7 on this side. The guide rail slide block 7 of the upper blade 3 is in sliding connection with the guide rail section 8 at the upper part, and the slide rail slide block of the lower blade 3 is in sliding connection with the guide rail section 8 at the lower part. During the translation of the two parallel opposite sides 6, the positioning block 10 and the chute 9 cooperate to release the driving force in the X-axis direction, while the rail slider 7 and the rail section 8 cooperate to enable the two blades 3 to move in opposite or opposite directions. The two blades 3 can move in opposite or opposite directions in the Z-axis direction while keeping parallel in the process of translating the two parallel opposite sides 6 by the joint cooperation of the positioning block 10, the sliding groove 9, the guide rail sliding block 7 and the guide rail section 8.
The X axis in this embodiment is a coordinate axis located on a horizontal plane and perpendicular to the emission direction of the ray in the three-dimensional coordinate system, the Z axis is a coordinate axis vertical and perpendicular to the X axis, and the Y axis is a coordinate axis located on a horizontal plane and perpendicular to the X axis.
According to the stepless slotting collimator 11, the purpose that one rotating opposite side 4 can be driven to rotate by only a single driving device, the characteristics of a parallelogram are utilized to enable two parallel opposite sides 6 to keep parallel and approach or separate from each other, the other rotating opposite side 4 is enabled to synchronously rotate, in the moving process of the two parallel opposite sides 6, two blades 3 are forced to keep parallel and approach or separate from each other along the Z-axis direction under the action of a guide rail section 8 and a chute 9 so as to adjust the distance between the two blades 3 is achieved, so that the precision of slotting control is improved, errors generated in the control process are reduced, the technical effects of greatly reducing the material cost of the device are achieved, the problem that in the related art, the stepless slotting collimator 11 has extra stress generated in the adjusting process due to the design error, the installation error and the like of the parallel guide rail, the service life of a motor is reduced, the control position and slotting width accuracy are influenced, and the problem that the two blades 3 are caused to have the symmetry relative to the center of a light plane 1 is solved by adopting double driving devices is solved.
The rotation amount of the rotating opposite side 4 and the translation amount of the blade 3 have a certain mathematical relationship, so that the translation amount of the blade 3 can be controlled by controlling the rotation amount of the rotating opposite side 4, and then the slotting value can be controlled. In order to control the rotation amount of the opposite rotating sides 4 conveniently, the driving assembly in the embodiment comprises a driving motor and a first encoder, wherein the driving motor is in transmission connection with the first encoder, and the output end of the first encoder is in transmission connection with the pin shaft 2 of one of the opposite rotating sides 4. The rotation amount of the driving motor can be obtained in real time through the first encoder, and the rotation amount of the rotating opposite side 4 can be determined based on the rotation amount of the driving motor.
In order to facilitate rotation, the driving assembly in this embodiment further includes a transmission shaft, and two ends of the transmission shaft are respectively in transmission connection with the driving motor and the first encoder through a coupling.
Since the rotating opposite side 4 not connected to the driving motor is passively rotated, the rotation angle of the rotating opposite side 4 should be perfectly identical to the rotation angle of the other rotating opposite side 4 in an ideal state. Therefore, in order to monitor the rotation process, the embodiment further comprises a second encoder, and the second encoder is in transmission connection with the pin shaft 2 of the other rotating opposite side 4 and is used for acquiring the rotation data of the rotating opposite side 4.
Further, the pin shafts 2 are hinged on the light plane 1, and the pin shafts 2 of the two opposite rotating sides 4 are symmetrical along the center line of the light plane 1; in order to facilitate connection of the opposite rotating edge 4 and the pin shaft 2, in this embodiment, a pivot pin hole is formed in the middle of the opposite rotating edge 4, and the pin shaft 2 passes through the pivot pin hole and is fixedly connected with the opposite rotating edge 4, so that the opposite rotating edge 4 can rotate around the axis of the rotary positioning pin.
Further, the blade 3 is provided in a flat plate shape or an arc shape. Since the projection ratio in the X-axis (or detector fan angle) direction is constant, the increment of the opening width of the collimator 11 is consistent in the stepping amount of the light field width of the detector surface in the X-axis (or detector fan angle) direction, and the arc collimator 11 has a more accurate control effect than the flat collimator 11. The blade 3 in this embodiment is therefore arc-shaped.
In order to improve the stability of the movement of the blade 3 by the flap, at least two guide rail sliding blocks 7 are arranged and distributed along the Z-axis direction in the embodiment, and the two guide rail sliding blocks 7 are in sliding connection with the corresponding guide rail sections 8. The positioning block 10 is arranged in a cylindrical shape or a rectangular shape.
According to another aspect of the present application, there is provided a CT scanning apparatus comprising the stepless slit collimator described above.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modifications, equivalent substitutions, improvements, or the like, which are within the spirit and principles of the present application, are intended to be included within the scope of the present application.
Claims (10)
1. A stepless slit collimator, characterized by comprising:
the device comprises a light plane, wherein a guide rail is arranged on the light plane along the Z-axis direction, the middle part of the guide rail is broken to form two coaxial guide rail sections, and the breaking distance between the two guide rail sections is larger than or equal to the coverage range of rays;
the parallelogram component is arranged on the light plane and comprises two rotary opposite sides and two parallel opposite sides, the middle part of each rotary opposite side is hinged with the light plane through a pin shaft, two ends of each parallel opposite side are respectively hinged with the corresponding rotary opposite side, and the parallel opposite sides are provided with sliding grooves along the X-axis direction;
the blade is arranged to be distributed along the Z-axis direction and two parallel to each other, the two blades are respectively connected with the two parallel opposite sides, guide rail sliding blocks and at least two positioning blocks are arranged on the blade, the guide rail sliding blocks of the two blades are respectively connected with the two guide rail sections in a sliding manner, and the positioning blocks of the two blades are respectively connected with the two sliding grooves of the two parallel opposite sides in a sliding manner.
2. The stepless slotted collimator of claim 1, wherein: the rotary opposite side is in transmission connection with the pin shaft of one rotary opposite side, and the rotary opposite side is driven to rotate around the axis of the pin shaft through the drive assembly.
3. The stepless slotted collimator of claim 2, wherein: the driving assembly comprises a driving motor and a first encoder, wherein the driving motor is in transmission connection with the first encoder, and the output end of the first encoder is in transmission connection with one of the pin shafts of the opposite rotating sides.
4. A stepless slit collimator according to claim 3, characterized in that: the driving assembly further comprises a transmission shaft, and two ends of the transmission shaft are respectively in transmission connection with the driving motor and the first encoder through a coupler.
5. The stepless slotted collimator of claim 4, wherein: the second encoder is in transmission connection with the pin shaft of the other rotating opposite side and is used for acquiring rotation data of the rotating opposite side.
6. The stepless slotted collimator of claim 1, wherein: the pin shafts are hinged to the light plane, and the pin shafts of the two opposite rotating sides are symmetrical along the center line of the light plane;
the middle part of the rotary opposite side is provided with a pivot pin hole, and the pin shaft penetrates through the pivot pin hole and is fixedly connected with the rotary opposite side, so that the rotary opposite side can rotate around the axis of the rotary positioning pin.
7. The stepless slotted collimator of claim 1, wherein: the blades are arranged in a flat plate shape or an arc shape.
8. The stepless slotted collimator of claim 1, wherein: the guide rail sliding blocks are arranged at least two and distributed along the Z-axis direction, and the two guide rail sliding blocks are both in sliding connection with the corresponding guide rail sections.
9. The stepless slotted collimator of claim 1, wherein: the positioning block is arranged in a cylindrical shape or a rectangular shape.
10. A CT scanning apparatus comprising a stepless slit collimator according to any one of claims 1 to 9.
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| CN202310015131.6A CN116027564B (en) | 2023-01-05 | 2023-01-05 | Stepless slotting collimator and CT scanning equipment |
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| CN202310015131.6A CN116027564B (en) | 2023-01-05 | 2023-01-05 | Stepless slotting collimator and CT scanning equipment |
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