A CBCT head side synchronous motion calibration device, method and equipment

Abstract

The present invention discloses a CBCT head side synchronous motion calibration device, method and equipment, the calibration device comprises a non-metallic plate, a metal wire fixedly arranged in the middle of the plate, and a plurality of X-ray auxiliary positioning structures fixedly arranged on the plate and parallel to the metal wire for indicating the projection position of the X-ray. The embodiment of the present invention indicates the irradiation position of the X-ray through the metal wire of the calibration device and the X-ray auxiliary positioning structure, so as to accurately calibrate the driver of the collimator and the detector, the structure is simple, and the calibration difficulty and time consumption can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of CBCT head side part synchronous motion calibration, and in particular to a CBCT head side part synchronous motion calibration device, method and equipment. Background Art

[0002] Since the collimator and detector of CBCT (oral and maxillofacial cone beam CT) are driven by different motors, when there is a slight difference in the running speed of the two motors, the X-rays emitted by the X-ray emitter cannot be aligned on the collimator and detector, affecting the normal use of CBCT. Therefore, it is necessary to calibrate the motor parameters of the collimator and detector so that the two can be accurately synchronized. In the prior art, it is generally relied on manual debugging by engineers based on subjective experience, which has the problems of high debugging difficulty, long time consumption and inconsistent debugging accuracy. Summary of the invention

[0003] In view of the above-mentioned defects in the prior art, the embodiments of the present invention provide a CBCT head side part synchronous motion calibration device, method and equipment to solve the above-mentioned technical problems.

[0004] In a first aspect, an embodiment of the present invention provides a CBCT head side part synchronous motion calibration device, comprising a non-metallic plate, a metal wire fixed to the middle of the plate, and a plurality of X-ray auxiliary positioning structures fixed on the plate and parallel to the metal wire for indicating the projection position of X-rays.

[0005] In addition, the projection length and / or the number of projection points of each of the X-ray assisted positioning structures are different.

[0006] In addition, the X-ray auxiliary positioning structure includes a plurality of metal balls evenly spaced and distributed in a direction parallel to the metal wire; one end of a plurality of the X-ray auxiliary positioning structures are aligned and distributed;

[0007] The number of the metal balls of the X-ray assisted positioning structure increases uniformly from one end of the plate body to the other end of the plate body.

[0008] In addition, the metal ball is glued and fixed to the plate; or

[0009] The plate body is provided with a pit or a mounting hole, and the metal ball is embedded in the pit or the mounting hole by interference fit.

[0010] In addition, a receiving groove is provided in the middle of the plate body for the metal wire to be embedded and received.

[0011] In addition, the plate body is an organic filter plate, and fixing holes for fixing the plate body are arranged at the four corners of the plate body.

[0012] In a second aspect, an embodiment of the present invention further provides a CBCT head side part synchronous motion calibration method, comprising:

[0013] Acquire a calibration image of X-rays when the collimator and the detector are moving; wherein the calibration image is acquired based on the calibration device as described in the first aspect;

[0014] determining whether the collimator and the detector are synchronized according to the position of the metal wire of the calibration device in the calibration image;

[0015] If they are not synchronized, the movement speed difference between the collimator and the detector is calculated based on the projection of the X-ray auxiliary positioning structure of the calibration device on the calibration image.

[0016] In addition, calculating the movement speed difference between the collimator and the detector according to the projection of the X-ray auxiliary positioning structure of the calibration device on the calibration image includes:

[0017] Extracting projections of at least two X-ray assisted positioning structures of the calibration device from the calibration image;

[0018] Calculating the displacement deviation of the collimator and the detector according to the projections of the at least two X-ray auxiliary positioning structures of the calibration device;

[0019] The ratio of the position deviation to the time when the displacement deviation is generated is taken as the movement speed difference between the collimator and the detector.

[0020] In a third aspect, an embodiment of the present invention further provides a CBCT head side part synchronous motion calibration device, which is configured in a calibration device, and the device includes:

[0021] An image acquisition module, used to acquire a calibration image of X-rays when the collimator and the detector are moving; wherein the calibration image is acquired based on the calibration device according to any one of claims 1 to 6;

[0022] A synchronization judgment module, used to determine whether the collimator and the detector are synchronized according to the position of the metal wire of the calibration device in the calibration image;

[0023] A parameter calculation module is used to calculate the movement speed difference between the collimator and the detector based on the projection of the X-ray auxiliary positioning structure of the calibration device on the calibration image if they are not synchronized.

[0024] In a fourth aspect, an embodiment of the present invention further provides a calibration device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the CBCT head side part synchronous motion calibration method as described in the second aspect is implemented.

[0025] Compared with the prior art, the embodiments of the present invention have at least the following beneficial effects: when using the CBCT head side synchronous motion calibration device of the present invention, the collimator of the CBCT can be replaced, the calibration device provided in the first aspect is installed at the location of the collimator, the driver of the collimator and the detector is started, and the X-rays of the X-ray emitter can penetrate the plate body. When the collimator and the detector are synchronized and aligned, the projection of the metal wire on the detector can be observed through the image, and the projection of the metal wire is always located in the middle of the image. When the collimator and the detector are not synchronized or misaligned, the projection of the X-ray auxiliary positioning structure on the detector can be observed. Personnel can accurately estimate the parameter deviation of the driver based on the projection of the X-ray auxiliary positioning structure on the detector, or the parameter deviation of the driver can be automatically calculated by the calibration method provided in the embodiment of the present invention, so as to adjust the driver parameters so that the collimator and the detector can be accurately synchronized and aligned. The embodiments of the present invention can reduce the difficulty of debugging, save debugging time, and help improve the calibration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0027] Figure 1 It is a structural schematic diagram of a CBCT head side part synchronous motion calibration device provided by an embodiment of the present invention;

[0028] Figure 2 is a flow chart of a CBCT head side part synchronous motion calibration method provided by an embodiment of the present invention;

[0029] Figure 3 It is a structural schematic diagram of a CBCT head side part synchronous motion calibration device provided by an embodiment of the present invention;

[0030] Figure 4 It is a structural schematic diagram of a CBCT head side part synchronous motion calibration device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] like Figure 1 As shown, in the first embodiment of the CBCT head side part synchronous motion calibration device of the present invention, the calibration device 1 includes a non-metallic plate body 2, a metal wire 3 fixed to the middle of the plate body 2, and a plurality of X-ray auxiliary positioning structures fixed on the plate body 2 and parallel to the metal wire 3 for indicating the projection position of the X-ray.

[0033] When the parameters of the driver of the CBCT collimator and detector need to be calibrated, the collimator of the CBCT itself can be removed, and the calibration device of this embodiment can be installed at the original location of the collimator. The driver of the collimator and detector is started. When there is a slight difference in the driver parameters of the collimator and detector, the movement speed of the collimator and detector is different. At this time, it can be judged whether the collimator and detector need to be calibrated by observing the projection of the metal wire and X-ray auxiliary positioning structure of the calibration device on the detector in the image. When the projection of the metal wire on the detector is always in the middle of the image, it indicates that the driver parameters of the collimator and the detector have been calibrated; when the projection of the metal wire is not on the detector, the projection of the X-ray auxiliary positioning structure on the detector can be observed. When the projection on the detector is the same X-ray auxiliary positioning structure, it indicates that the driver parameters are consistent. At this time, just adjust the driver to make the projection of the metal wire appear on the detector; when the projection of different X-ray auxiliary positioning structures appears on the detector, it indicates that there is a difference in the driving speed of the collimator and the driver. At this time, the speed difference between the collimator and the detector can be judged with the help of the projection of the X-ray auxiliary positioning structure on the detector and manually adjusted until the projection position of the metal wire on the detector is correct. Alternatively, the method of Example 2 can be used to automatically calculate the difference in the movement speed of the collimator and the detector, so as to adjust the parameters of the driver accordingly, so that the calibration of the driver of the collimator and the detector can be achieved more quickly in one step.

[0034] The diameter of the metal wire 3 can refer to the diameter of the metal wire of the collimator of the CBCT. The non-metallic plate 2 can be rectangular. The plate 2 can be an organic filter plate, that is, made of organic material. However, it is not limited to this. As long as the plate 2, the metal wire 3 and the X-ray auxiliary positioning structure have different degrees of shielding or absorption of X-rays, when the X-rays are aligned with the metal wire or the X-ray auxiliary positioning structure, the metal wire and the X-ray auxiliary positioning structure can form an obvious projection on the detector, which is convenient for determining the position of X-ray irradiation.

[0035] The middle of the plate body 2 may be provided with an accommodating groove for the metal wire 3 to be embedded and accommodated.

[0036] Fixing holes 5 for fixing the plate body 2 are provided at four corners of the plate body 2, so as to facilitate installation of the calibration device on the CBCT equipment.

[0037] Optionally, the projection length and / or projection point number of each X-ray auxiliary positioning structure is different, so that the position of the X-ray in the calibration device can be identified by the difference in projection length and / or projection point number. It is understandable that the position of the X-ray in the calibration device can also be determined by the difference in width of the X-ray auxiliary positioning structure, etc., and no specific limitation is made here.

[0038] Further, each X-ray auxiliary positioning structure includes a plurality of metal balls 4 evenly spaced and distributed in a direction parallel to the metal wire 3. From one end of the plate body 2 to the other end of the plate body 2, the number of metal balls 4 of the X-ray auxiliary positioning structure increases evenly. For example, from the left end of the plate body 2 to the right end of the plate body 2, the number of metal balls 4 of each X-ray auxiliary positioning structure gradually increases by 1, so that the current irradiation position of the X-ray in the calibration device can be identified according to the number of metal balls 4 (i.e., the number of projection points). For example, when the projection of 13 metal balls 4 appears in the image, it can be known that the X-ray irradiates the area of ​​the calibration device where 13 metal balls 4 are set. It can be understood that as long as the irradiation position of the X-ray on the calibration device can be determined by the projection of the X-ray auxiliary positioning structure, this embodiment does not impose specific restrictions on each X-ray auxiliary positioning structure and its arrangement. The X-ray auxiliary positioning structure can also use metal strips of different widths.

[0039] Optionally, one end of a plurality of X-ray assisted positioning structures is aligned and distributed, for example, the upper ends or lower ends of a plurality of metal balls 4 are aligned. Figure 1 As shown, the plurality of metal balls 4 are arranged in a right triangle, and the tops of the metal balls 4 in each row of the plurality of metal balls 4 are flush.

[0040] The metal ball 4 can be glued and fixed to the plate body 2. Alternatively, the plate body 2 can be provided with a pit or a mounting hole, and the metal ball 4 can be inserted into the pit or the mounting hole by interference fit. It can be understood that the metal ball can also be a metal column or a metal nail structure with a metal cap, and there is no specific limitation here, as long as it is easy to install on the plate body 2 and can form a projection that is easy to identify on the detector.

[0041] Compared with the prior art, the embodiments of the present invention have at least the following beneficial effects: when using the CBCT head side synchronous motion calibration device of the present invention, the collimator of the CBCT can be replaced, the calibration device provided by the present embodiment can be installed at the location of the collimator, the driver of the collimator and the detector is started, and the X-rays of the X-ray emitter can penetrate the plate. When the collimator and the detector are synchronized and aligned, the projection of the metal wire can be observed through the image, and the projection of the metal wire is always located in the middle of the image. When the collimator and the detector are not synchronized or aligned, the projection of the X-ray auxiliary positioning structure on the detector can be observed, and personnel can accurately estimate the parameter deviation of the driver based on the projection of the X-ray auxiliary positioning structure on the detector. The embodiments of the present invention can reduce the difficulty of driver calibration and debugging, save debugging time, and help improve calibration accuracy.

[0042] Figure 2 This is a flow chart of a CBCT head side part synchronous motion calibration method provided in the second embodiment. Figure 2As shown, the embodiment of the present invention specifically includes steps 201 to 203.

[0043] Step 201: Acquire a calibration image of X-rays when the collimator and the detector are moving.

[0044] The calibration image is acquired based on the calibration device described in the above embodiment. When acquiring the calibration image, the calibration device of the above embodiment is installed on the CBCT device to replace the original collimator of the CBCT device. Then the collimator and the detector are started, and the calibration image acquired by the detector is acquired at the same time.

[0045] Step 202: Determine whether the collimator and the detector are synchronized according to the position of the metal wire of the calibration device in the calibration image. If they are synchronized, the process ends; if they are not synchronized, execute step 203.

[0046] The acquired calibration image is processed to extract the projection in the calibration image. The projection may be the projection of the metal wire or the projection of the X-ray auxiliary positioning structure on the detector. When the metal wire of the calibration device is always projected on the detector, it indicates that the collimator and the detector are well out of sync, and the calibration can be ended at this time. When the X-ray auxiliary positioning structure of the calibration device is projected on the detector, further calibration is required.

[0047] Step 203: Calculate the movement speed difference between the collimator and the detector according to the projection of the X-ray auxiliary positioning structure of the calibration device on the calibration image.

[0048] Specifically, step 203 of determining whether the collimator and the detector are synchronized according to the position of the metal wire of the calibration device in the calibration image may include: extracting projections of at least two X-ray auxiliary positioning structures of the calibration device from the calibration image; calculating the displacement deviation of the collimator and the detector according to the projections of the at least two X-ray auxiliary positioning structures of the calibration device; and taking the ratio of the position deviation to the time of generating the displacement deviation as the movement speed difference between the collimator and the detector.

[0049] When there is a slight error in the driving speed of the collimator and detector drivers, the position of the metal wire will deviate, so that the projection of the metal wire is not on the detector. Correspondingly, the projection of the X-ray auxiliary positioning structure will appear on the detector. The projections of two different X-ray auxiliary positioning structures on the detector can be found, and the time difference between the two projections can be extracted. The integral of the speed difference of the collimator and detector drivers within the time difference (i.e., the displacement deviation of the two driver outputs) is calculated in combination with the position difference of the two different X-ray auxiliary positioning structures. The ratio of the displacement deviation to the time difference is taken as the speed difference of the two drivers, and then the working parameters of the two drivers are adjusted according to the speed difference, so that the driving speeds of the two are more consistent.

[0050] Compared with the prior art, this embodiment can reduce the difficulty of driver calibration and debugging, save debugging time, and is conducive to improving calibration accuracy.

[0051] The embodiment of the present invention provides a CBCT head side part synchronous motion calibration device. The calibration device can be a PC, a smart phone or a laptop computer connected to the CBCT for communication. Figure 3 As shown, the calibration device 300 includes: an image acquisition module 301 , a synchronization judgment module 302 and a parameter calculation module 303 .

[0052] The image acquisition module 301 is used to acquire a calibration image of X-rays when the collimator and the detector are moving; wherein the calibration image is acquired based on the calibration device described in the above embodiment.

[0053] The synchronization determination module 302 is used to determine whether the collimator and the detector are synchronized according to the position of the metal wire of the calibration device in the calibration image.

[0054] The parameter calculation module 303 is used to calculate the movement speed difference between the collimator and the detector according to the projection of the X-ray auxiliary positioning structure of the calibration device on the calibration image if they are not synchronized.

[0055] Optionally, the parameter calculation module 303 may include:

[0056] A projection identification submodule, used to extract projections of at least two X-ray assisted positioning structures of the calibration device from the calibration image;

[0057] a displacement deviation calculation submodule, configured to calculate the displacement deviations of the collimator and the detector according to projections of the at least two X-ray auxiliary positioning structures of the calibration device; and

[0058] The speed difference calculation submodule is used to use the ratio of the position deviation to the time when the displacement deviation is generated as the movement speed difference between the collimator and the detector.

[0059] Compared with the prior art, this embodiment can reduce the difficulty of driver calibration and debugging, save debugging time, and is conducive to improving calibration accuracy.

[0060] Figure 4 A schematic diagram of the structure of a calibration device provided in an embodiment of the present invention, the calibration device includes a memory 41, a processor 42, and a computer program stored in the memory 41 and executable on the processor 42, and the processor 42 implements the technical solution of any of the aforementioned method embodiments when executing the program.

[0061] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a computer processor, it is used to execute the technical solution in any method embodiment.

[0062] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (FLASH), a hard disk or an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a grid device, etc.) to execute the methods described in each embodiment of the present invention.

[0063] It is worth noting that in the embodiment of the above-mentioned calibration device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0064] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A CBCT head side synchronous motion calibration method, characterized in that: The method comprises: Acquire a calibration image of X-rays when the collimator and the detector are moving; wherein the calibration image is acquired based on the calibration device; the calibration device comprises a non-metallic plate, a metal wire fixedly mounted in the middle of the plate, and a plurality of X-ray auxiliary positioning structures fixedly mounted on the plate and parallel to the metal wire for indicating the projection position of the X-rays; each of the X-ray auxiliary positioning structures has a different projection length and / or projection point number; the X-ray auxiliary positioning structure comprises a plurality of metal balls evenly spaced and distributed in a direction parallel to the metal wire; one end of a plurality of the X-ray auxiliary positioning structures are aligned and distributed; the number of metal balls of the X-ray auxiliary positioning structure increases evenly from one end of the plate to the other end of the plate; determining whether the collimator and the detector are synchronized according to the position of the metal wire of the calibration device in the calibration image; If they are not synchronized, the movement speed difference between the collimator and the detector is calculated based on the projection of the X-ray auxiliary positioning structure of the calibration device on the calibration image.

2. The CBCT head side synchronous motion calibration method according to claim 1, characterized in that: Calculating the movement speed difference between the collimator and the detector according to the projection of the X-ray auxiliary positioning structure of the calibration device on the calibration image includes: Extracting projections of at least two X-ray assisted positioning structures of the calibration device from the calibration image; Calculating the displacement deviation of the collimator and the detector according to the projections of the at least two X-ray auxiliary positioning structures of the calibration device; The ratio of the position deviation to the time when the displacement deviation is generated is taken as the movement speed difference between the collimator and the detector.

3. The CBCT head side synchronous motion calibration method according to claim 1, characterized in that: The metal ball is glued and fixed to the plate; or The plate body is provided with a pit or a mounting hole, and the metal ball is embedded in the pit or the mounting hole by interference fit.

4. The CBCT head side synchronous motion calibration method according to claim 1, characterized in that: The middle part of the plate body is provided with an accommodating groove for the metal wire to be embedded and accommodated.

5. The CBCT head side synchronous motion calibration method according to claim 1, characterized in that: The plate body is an organic filter plate, and fixing holes for fixing the plate body are arranged at four corners of the plate body.

6. A CBCT head side synchronous motion calibration device, characterized in that: Configured in a calibration device, the device comprises: An image acquisition module, used for acquiring a calibration image of X-rays when a collimator and a detector are moving; wherein the calibration image is acquired based on a calibration device; the calibration device comprises a non-metallic plate, a metal wire fixedly mounted in the middle of the plate, and a plurality of X-ray auxiliary positioning structures fixedly mounted on the plate and parallel to the metal wire for indicating the projection position of the X-rays; each of the X-ray auxiliary positioning structures has a different projection length and / or projection point number; the X-ray auxiliary positioning structure comprises a plurality of metal balls evenly spaced and distributed in a direction parallel to the metal wire; one end of a plurality of the X-ray auxiliary positioning structures are aligned and distributed; the number of metal balls of the X-ray auxiliary positioning structure increases evenly from one end of the plate to the other end of the plate; A synchronization judgment module, used to determine whether the collimator and the detector are synchronized according to the position of the metal wire of the calibration device in the calibration image; A parameter calculation module is used to calculate the movement speed difference between the collimator and the detector based on the projection of the X-ray auxiliary positioning structure of the calibration device on the calibration image if they are not synchronized.

7. The CBCT head side synchronous motion calibration device according to claim 6, characterized in that: The metal ball is glued and fixed to the plate; or The plate body is provided with a pit or a mounting hole, and the metal ball is embedded in the pit or the mounting hole by interference fit.

8. The CBCT head side synchronous motion calibration device according to claim 6, characterized in that: The middle part of the plate body is provided with an accommodating groove for the metal wire to be embedded and accommodated.

9. The CBCT head side synchronous motion calibration device according to claim 6, characterized in that: The plate body is an organic filter plate, and fixing holes for fixing the plate body are arranged at four corners of the plate body.

10. A calibration device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the CBCT head side part synchronous motion calibration method according to any one of claims 1 to 5 when executing the program.

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