Collimator precision measuring device and measuring method for radiotherapy equipment

Abstract

The invention discloses a collimator precision measuring device and measuring method for radiotherapy equipment, and belongs to the technical field of radiotherapy equipment. According to the device, the high-precision measurement of the relative position of the secondary collimator and the primary collimator is realized through the combination of the laser positioning tracker and the measuring tool. The laser positioning tracker can accurately capture the position and the movement track of the target ball, and the accuracy of measured data is ensured. The design of the measuring tool can effectively measure the parallelism of the rotation tracks of the three cylinder positions and the absolute horizontal plane and the coaxiality of the central axis of the secondary collimator and the central axis of the primary collimator, and therefore it is ensured that the precision of the measuring result meets the treatment requirement. By ensuring the precise alignment of the secondary collimator and the primary collimator, the accuracy and effect of radiotherapy can be remarkably improved. The precise alignment of the collimator can optimize beam distribution, ensure that high-dose irradiation is precisely focused on a tumor focus area, and reduce damage to surrounding normal tissues at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of radiotherapy equipment, and more specifically, to a collimator accuracy measurement device and a measurement method for radiotherapy equipment. Background Art

[0002] In the field of radiotherapy equipment technology, ensuring the precise alignment of the collimator is the key to achieving treatment accuracy. With the continuous advancement of radiotherapy technology, traditional radiotherapy methods are gradually evolving towards precision radiosurgery, which emphasizes "precise diagnosis, precise positioning, precise planning, and precise treatment" of tumors. Precision stereotactic radiotherapy technology gives high-dose irradiation to tumors through 1-5 fractions, which significantly improves the local control rate of tumors, while reducing complications of normal tissues and improving treatment effects. The core of this technology is to expand and optimize the distribution of beams in the treatment space, use multiple non-coplanar high-dose small field irradiation, and accurately focus on the tumor lesion area, so that the dose distribution quickly decreases at the edge of the target, reducing damage to surrounding normal tissues, and greatly improving the adaptability and effectiveness of radiotherapy.

[0003] During the treatment process, the coaxiality of the inner holes of the primary collimator and the secondary collimator has a decisive influence on ensuring the treatment effect and safety. The precise matching of the inner hole coaxiality is a key factor in achieving efficient treatment and reducing side effects. Therefore, in the mechanical assembly stage, ensuring the coaxiality of the primary collimator and the secondary collimator has become a technical challenge that must be solved. The existing measurement technology for the relative position of the secondary collimator and the primary collimator mainly relies on manual adjustment and manual visual inspection. This method not only has limited accuracy and low efficiency, but is also easily interfered by human factors. Since the accuracy of manual adjustment is difficult to guarantee, it may lead to inaccurate switching of the collimator, which will affect the treatment effect and may even cause unnecessary harm to the patient. Summary of the invention

[0004] The present invention aims to solve the technical problems of low accuracy and low efficiency in measuring the relative position between a secondary collimator and a primary collimator in the prior art, and provides a collimator accuracy measuring device and a measuring method for radiotherapy equipment.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A collimator accuracy measuring device for radiotherapy equipment, the radiotherapy equipment comprising a primary collimator, a secondary collimator automatic switching mechanism and at least one secondary collimator, wherein:

[0007] The secondary collimator automatic switching mechanism comprises a fixed plate, a driving assembly and a moving plate, the primary collimator is mounted on one end of the fixed plate, and the moving plate is mounted on the other end of the fixed plate;

[0008] The movable disk is also provided with barrel positions corresponding to the secondary collimators one by one, and the secondary collimators are installed in the barrel positions one by one. The driving assembly is configured to drive the movable disk to rotate at a specified angle to adjust the position of the secondary collimators;

[0009] The collimator accuracy measuring device comprises a level, a laser positioning tracker, laser positioning tracker accessories and a measuring tool, wherein:

[0010] The level is used to calibrate the absolute level of the lower end surface of the primary collimator;

[0011] The measuring tool comprises a base and a mounting bracket connected to the base, wherein the base is configured to be embedded and mounted in the barrel position;

[0012] The laser positioning tracker accessory includes a first target ball and a second target ball. The measuring tool is vertically arranged during measurement. The first target ball and the second target ball are installed on the mounting bracket at intervals along the height direction.

[0013] The laser positioning tracker is used to emit a laser beam and receive a reflected signal. The surfaces of the first target ball and the second target ball are both provided with a reflective layer for reflecting the laser beam back to the laser positioning tracker. The laser positioning tracker establishes communication with the first target ball and the second target ball through optical coupling to determine the position coordinates of the first target ball and the second target ball in three-dimensional space.

[0014] Further, the laser positioning tracker comprises:

[0015] An optical receiver, used for receiving reflected signals from the first target ball and the second target ball;

[0016] A processor is used to convert the reflection signal into an electrical signal and perform data processing to output the position information of the first target ball and the second target ball.

[0017] Furthermore, the driving component is a stepping motor.

[0018] Furthermore, the number of the barrel positions is 3, and the 3 barrel positions are evenly distributed on the circumference of the moving disk at equal intervals of 120°, and the central angle between adjacent barrel positions is 120°.

[0019] Furthermore, the models of the secondary collimators are different from each other, and the first target ball and the second target ball have the same size and shape.

[0020] A method for measuring the accuracy of a collimator for radiotherapy equipment is provided. Based on the aforementioned device for measuring the accuracy of a collimator for radiotherapy equipment, the method comprises the following steps:

[0021] Placing the level on the lower end surface of the primary collimator, calibrating the absolute level of the lower end surface of the primary collimator, and establishing the absolute horizontal plane of the primary collimator; using a laser positioning tracker to find the central axis of the primary collimator; the absolute horizontal plane is perpendicular to the central axis;

[0022] The automatic switching mechanism of the secondary collimator is installed at the lower end of the primary collimator, and the measuring tool is embedded and installed in each of the cylinder positions in sequence; the moving disk is driven to rotate one circle by the driving assembly, and the parallelism of the trajectory circular surface formed by the rotation trajectory of the first target ball and / or the second target ball and the absolute horizontal plane is measured by the laser positioning tracker.

[0023] Further, the calculation method of the parallelism is:

[0024] Calculating the vertical distance between each sampling point on each trajectory circular surface and the absolute horizontal plane;

[0025] The difference between the maximum and minimum vertical distances is taken as the parallelism deviation;

[0026] If the parallelism deviation is less than or equal to the preset threshold, it is determined that the installation of the secondary collimator meets the parallelism requirement.

[0027] Furthermore, the collimator accuracy measurement method further includes:

[0028] Based on the measurement result of the parallelism, respectively adjust the position and angle of each of the barrel positions;

[0029] The coaxiality between each of the barrel positions and the central axis of the primary collimator is measured by the laser positioning tracker.

[0030] Further, the coaxiality between each of the barrel positions and the central axis of the primary collimator is measured as follows:

[0031] The rotation trajectory of the first target ball forms a first trajectory circular surface, and the rotation trajectory of the second target ball forms a second trajectory circular surface, and the center of the first trajectory circular surface and the center of the second trajectory circular surface are connected to form a concentric axis;

[0032] calculating a distance and an angular deviation between the concentric axis and the central axis of the primary collimator;

[0033] The position of each of the barrel positions is adjusted according to the calculation result so that the distance and angle deviation between the concentric axis and the central axis are within a preset threshold range.

[0034] Furthermore, the diameter of the circular track surface formed by the rotation track of the first target ball is d1, and the diameter of the circular track surface formed by the rotation track of the second target ball is d2. The collimator accuracy measurement method includes:

[0035] By comparing the diameter d1 and the diameter d2, the installation position deviation of each cylinder position is determined;

[0036] By comparing the distances from the diameter d1 and the diameter d2 to the central axis, it is determined whether the eccentric distance between the primary collimator and the moving disk is within a preset tolerance range.

[0037] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0038] The present invention provides a collimator accuracy measurement device and a measurement method for radiotherapy equipment. The device realizes high-precision measurement of the relative position of the secondary collimator and the primary collimator by combining a laser positioning tracker and a measuring tool. The laser positioning tracker can accurately capture the position and motion trajectory of the target ball to ensure the accuracy of the measurement data. The design of the measuring tool can effectively measure the parallelism of the rotation trajectory of the three barrel positions with the absolute horizontal plane, as well as the coaxiality of the central axis of the secondary collimator and the primary collimator, so as to ensure that the accuracy of the measurement result meets the treatment requirements. The measurement process of the present invention adopts a laser tracker and automatic data acquisition technology to reduce human intervention and operation errors. The traditional manual adjustment and visual inspection methods are not only inefficient, but also easily affected by human factors. The present invention significantly improves the measurement efficiency and reliability through automatic measurement and data analysis. The present invention simplifies the measurement and adjustment process of the relative position of the secondary collimator and the primary collimator through standardized measurement methods and tool design. The use of the measuring tool and the laser tracker makes the operation more intuitive and convenient, which not only reduces the difficulty of operation, but also reduces the training cost and time of operators. By ensuring the precise alignment of the secondary collimator with the primary collimator, the present invention can significantly improve the accuracy and effectiveness of radiotherapy. Accurate collimator alignment can optimize beam distribution, ensuring that high-dose irradiation is precisely focused on the tumor lesion area while reducing damage to surrounding normal tissues. This is of great significance for improving the local control rate of tumors and reducing the incidence of complications. The measuring tool and measuring method of the present invention have high versatility and compatibility, and can be applied to various types of radiotherapy equipment. This flexibility enables the present invention to be widely used in different medical scenarios, meet the calibration requirements of different equipment, and has high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 is a structural schematic diagram of a measurement tool in a collimator accuracy measurement device provided in an embodiment of the present application installed on a radiotherapy device at a first viewing angle;

[0041] Figure 2 is a structural schematic diagram of a measurement tool in a collimator accuracy measurement device provided in an embodiment of the present application installed on a radiotherapy device at a second viewing angle;

[0042] Figure 3 It is a schematic diagram of the three-dimensional structure of a measuring tool in a collimator accuracy measuring device provided in one embodiment of the present application;

[0043] Description of the markings in the figure:

[0044] 1. Primary collimator;

[0045] 2. Automatic switching mechanism of secondary collimator; 21. Fixed disk; 22. Moving disk; 221. Cylinder position;

[0046] 3. Secondary collimator;

[0047] 11. Measuring tool; 111. Base; 112. Mounting bracket;

[0048] 12. First target ball; 13. Second target ball. DETAILED DESCRIPTION

[0049] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0050] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0051] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. The specific dimensions used in the embodiments are only for illustrating the technical solutions and do not limit the scope of protection of the present invention. It is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0052] Unless otherwise clearly specified and limited, the terms "install", "set", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] In order to thoroughly understand the present application, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0054] Embodiment 1:

[0055] like Figure 1-3 As shown, the present invention provides a technical solution:

[0056] A collimator accuracy measuring device for radiotherapy equipment, the radiotherapy equipment comprising a primary collimator 1, a secondary collimator automatic switching mechanism 2 and at least one secondary collimator 3, wherein:

[0057] The secondary collimator automatic switching mechanism 2 comprises a fixed plate 21, a driving assembly and a moving plate 22, the primary collimator 1 is mounted on one end of the fixed plate 21, and the moving plate 22 is mounted on the other end of the fixed plate 21;

[0058] The movable disk 22 is also provided with barrel positions 221 corresponding to each of the secondary collimators 3, and each of the secondary collimators 3 is installed in each of the barrel positions 221 in a one-to-one correspondence. The driving assembly is configured to drive the movable disk 22 to rotate at a specified angle to adjust the position of the secondary collimator 3;

[0059] The collimator accuracy measuring device comprises a level, a laser positioning tracker, laser positioning tracker accessories and a measuring tool 11, wherein:

[0060] The level is used to calibrate the absolute level of the lower end surface of the primary collimator 1;

[0061] The measuring fixture 11 comprises a base 111 and a mounting bracket 112 connected to the base 111, wherein the base 111 is configured to be embedded and mounted in the barrel position 221; the measuring fixture 11 is used to measure the parallelism between the circular surface formed by the rotation trajectory of each barrel position 221 and the absolute horizontal plane, and is also used to measure the coaxiality between each barrel position 221 of the secondary collimator 3 and the central axis of the primary collimator 1;

[0062] The laser positioning tracker accessory includes a first target ball 12 and a second target ball 13. The measuring tool 11 is vertically arranged during measurement. The first target ball 12 and the second target ball 13 are installed on the mounting bracket 112 at intervals along the height direction.

[0063] The laser positioning tracker is used to emit a laser beam and receive a reflected signal. The surfaces of the first target sphere 12 and the second target sphere 13 are both provided with a reflective layer for reflecting the laser beam back to the laser positioning tracker. The laser positioning tracker establishes communication with the first target sphere 12 and the second target sphere 13 through optical coupling to determine the position coordinates of the first target sphere 12 and the second target sphere 13 in three-dimensional space.

[0064] Among them, the number of the cylinder positions 221 is 3.

[0065] The working principle of the collimator accuracy measurement device is as follows:

[0066] 1. Determination of the central axis of the primary collimator 1:

[0067] Use a level to calibrate the absolute level of the lower end surface of the primary collimator 1;

[0068] Use a laser positioning tracker to find the central axis of the primary collimator 1;

[0069] By using a laser positioning tracker, the absolute horizontal plane coordinate system is mapped onto the target sphere of the horizontal reference plane to establish the absolute horizontal plane of the primary collimator 1;

[0070] The absolute position perpendicular to the mechanical axis of the primary collimator 1 is obtained in the software of the laser positioning tracker as the reference for the following measurements;

[0071] 2. Installation and adjustment of secondary collimator 3:

[0072] Install the secondary collimator 3 onto the primary collimator 1, and re-measure and confirm the position of the central axis of the primary collimator 1;

[0073] The parallelism between the circular surface formed by the rotation tracks of the three barrel positions 221 in the secondary collimator 3 and the absolute horizontal plane is measured by a laser tracking locator and a measuring fixture 11;

[0074] According to the measurement results, adjust the positions and angles of the three barrel positions 221 to ensure that the diameter and roundness of the trajectory circle meet the tolerance requirements; measure the parallelism between the circular surface (a number of points are taken at equal intervals of 30° every 30°) formed by the rotation trajectory of the target ball and the absolute horizontal plane (established in step 1) when the three barrel positions 221 are loaded into the measuring fixture 11; according to the measurement results, adjust the positions and angles of the three barrel positions 221 respectively;

[0075] By comparing the diameter and roundness of the track circle, the deviation should meet the tolerance requirements (the deviation requirement of the upper and lower track circle diameters d1 and d2 is 0.1mm, and the roundness requirement is 0.05mm);

[0076] 3. Coaxiality measurement and adjustment:

[0077] Using a laser tracking locator and a measuring fixture 11, measure the coaxiality between the three barrel positions 221 in the secondary collimator 3 and the central axis of the primary collimator 1;

[0078] The position of the secondary collimator 3 is adjusted according to the measurement result so that the distance between the two axes meets the tolerance requirement. In the patient plane, the deviation of the distance between the two axes does not exceed 0.15 mm.

[0079] In this embodiment, by using a level and a laser positioning tracker, the device can accurately calibrate the absolute level of the primary collimator 1, and measure the position coordinates of the secondary collimator 3 through the first target ball 12 and the second target ball 13 in the laser positioning tracker attachment. This high-precision measurement method greatly reduces human errors and improves the accuracy and efficiency of measurement. The drive component in the secondary collimator automatic switching mechanism 2 can drive the moving disk 22 to rotate at a specified angle, thereby automatically adjusting the position of the secondary collimator 3. This automated design not only reduces the need for manual operation, but also improves the ease of use and operating efficiency of the equipment.

[0080] Embodiment 2:

[0081] Based on Example 1, Figure 1-3 , the laser positioning tracker comprises:

[0082] An optical receiver, used to receive reflected signals from the first target sphere 12 and the second target sphere 13;

[0083] The processor is used to convert the reflection signal into an electrical signal and perform data processing to output the position information of the first target ball 12 and the second target ball 13.

[0084] Furthermore, the driving component is a stepping motor.

[0085] Furthermore, the three cylinder positions 221 are evenly distributed on the circumference of the moving disk 22 at an equal interval angle of 120°, and the central angle between adjacent cylinder positions 221 is 120°.

[0086] Furthermore, the models of the secondary collimators 3 are different from each other, and the first target sphere 12 and the second target sphere 13 are the same in size and shape.

[0087] Specifically, the method of using the collimator accuracy measuring device is as follows:

[0088] Using a laser positioning tracker to determine the central axis of the primary collimator 1, and establishing a coordinate system to determine the position of the central axis in the coordinate system;

[0089] Use a laser tracker and a coaxiality measuring fixture 11 to rotate the collimator switching device for one circle, and measure the track diameter d1 and the roundness of the target balls in and out of the fixture. The size of the roundness can be used to determine whether the measurement result has a deviation; the track circle diameter deviation requirement is <0.1mm, and the roundness deviation requirement is <0.05mm;

[0090] Use the laser tracker and the coaxiality measuring fixture 11 to rotate the collimator switching device for one circle, measure the track diameter d2 of the inner target ball in the fixture and the size of its roundness, and judge whether the measurement result has deviation; the track circle diameter deviation requirement is 0 < .1mm, and the roundness deviation requirement is < 0.05mm;

[0091] By comparing the sizes of d1 and d2, the installation position deviation of the installation tube of the secondary collimator 3 is determined;

[0092] By comparing the distances from d1 / d2 to the central axis of the primary collimator 1, it is determined whether the eccentric distance between the primary collimator 1 and the moving disk 22 of the collimator switching device is consistent with the design value; the distance deviation requirement is <0.15mm.

[0093] Embodiment 3:

[0094] The present invention provides a technical solution:

[0095] A method for measuring the accuracy of a collimator for radiotherapy equipment is provided. Based on the aforementioned device for measuring the accuracy of a collimator for radiotherapy equipment, the method comprises the following steps:

[0096] Placing the level on the lower end surface of the primary collimator 1, calibrating the absolute level of the lower end surface of the primary collimator 1, and establishing the absolute horizontal plane of the primary collimator 1; using a laser positioning tracker to find the central axis of the primary collimator 1; the absolute horizontal plane is perpendicular to the central axis;

[0097] The secondary collimator automatic switching mechanism 2 is installed to the lower end of the primary collimator 1, and the measuring tool 11 is embedded and installed in each of the tube positions 221 in sequence; the moving disk 22 is driven to rotate one circle by the driving assembly, and the parallelism of the trajectory circular surface formed by the rotation trajectory of the first target sphere 12 and / or the second target sphere 13 and the absolute horizontal plane is measured by the laser positioning tracker.

[0098] Embodiment 4:

[0099] Based on Example 3, the calculation method of the parallelism is:

[0100] Calculating the vertical distance between each sampling point on each trajectory circular surface and the absolute horizontal plane;

[0101] The difference between the maximum and minimum vertical distances is taken as the parallelism deviation;

[0102] If the parallelism deviation is less than or equal to the preset threshold, it is determined that the installation of the secondary collimator 3 meets the parallelism requirement.

[0103] Furthermore, the collimator accuracy measurement method further includes:

[0104] Based on the measurement result of the parallelism, the position and angle of each of the barrel positions 221 are adjusted respectively;

[0105] The coaxiality between each of the barrel positions 221 and the central axis of the primary collimator 1 is measured by the laser positioning tracker.

[0106] Further, the coaxiality between each of the barrel positions 221 and the central axis of the primary collimator 1 is measured as follows:

[0107] The rotation trajectory of the first target ball 12 forms a first trajectory circular surface, and the rotation trajectory of the second target ball 13 forms a second trajectory circular surface, and the center of the first trajectory circular surface and the center of the second trajectory circular surface are connected to form a concentric axis;

[0108] Calculating the distance and angular deviation between the concentric axis and the central axis of the primary collimator 1;

[0109] The position of each of the cylinder positions 221 is adjusted according to the calculation result so that the distance and angle deviation between the concentric axis and the central axis are within a preset threshold range.

[0110] Further, the calculation method of coaxiality includes:

[0111] Calculating the radial offset between the center of the first trajectory circular surface, the center of the second trajectory circular surface and the central axis of the primary collimator 1;

[0112] The maximum value of the radial offset is taken as the coaxiality deviation.

[0113] Furthermore, the diameter of the circular track surface formed by the rotation track of the first target ball 12 is d1, and the diameter of the circular track surface formed by the rotation track of the second target ball 13 is d2. The collimator accuracy measurement method includes:

[0114] By comparing the diameter d1 and the diameter d2, the installation position deviation of each cylinder position 221 is determined;

[0115] By comparing the distances from the diameter d1 and the diameter d2 to the central axis, it is determined whether the eccentric distance between the primary collimator 1 and the moving disk 22 is within a preset tolerance range.

[0116] Embodiment 5:

[0117] The present invention provides a technical solution:

[0118] A method for measuring the accuracy of a collimator for radiotherapy equipment is provided. Based on the aforementioned device for measuring the accuracy of a collimator for radiotherapy equipment, the method comprises the following steps:

[0119] S1, start;

[0120] S2, using a laser positioning tracker to find the central axis of the primary collimator 1;

[0121] S3, mapping the absolute horizontal plane coordinate system to the target ball on the robot base;

[0122] S4. Establishing the absolute horizontal plane of the robot in the laser positioning tracker system;

[0123] S5, re-measure and confirm the position of the central axis of the primary collimator 1;

[0124] S6, measuring the parallelism between the circular surface formed by the rotation tracks of the three barrel positions 221 and the absolute horizontal plane by using a laser positioning tracker and a measuring tool 11;

[0125] S7, judging whether the parallelism requirement is met, if not, executing S71, if yes, executing S8;

[0126] S71, adjusting the positions and angles of the three barrel positions 221 according to the measurement results to ensure that the diameter and roundness of the trajectory circle meet the tolerance requirements; if they meet the requirements, executing S8;

[0127] S8, measuring the concentricity of the three barrel positions 221 and the central axis of the primary collimator 1 by using a laser tracking locator and a measuring fixture 11;

[0128] S9, judging whether the concentricity requirement is met; if not, executing S91, if yes, executing S10;

[0129] S91, adjust the positions of the entire three-station according to the measurement results so that the distance between the two axes meets the tolerance requirements; if it meets the requirements, execute S10;

[0130] S10, end.

[0131] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0132] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0133] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various application aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the application point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0134] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0135] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be construed as a limitation to the claims. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A collimator accuracy measuring device for radiotherapy equipment, characterized in that: The radiotherapy device comprises a primary collimator, a secondary collimator automatic switching mechanism and at least one secondary collimator, wherein: The secondary collimator automatic switching mechanism comprises a fixed plate, a driving assembly and a moving plate, the primary collimator is mounted on one end of the fixed plate, and the moving plate is mounted on the other end of the fixed plate; The movable disk is also provided with barrel positions corresponding to the secondary collimators one by one, and the secondary collimators are installed in the barrel positions one by one. The driving assembly is configured to drive the movable disk to rotate at a specified angle to adjust the position of the secondary collimators; The collimator accuracy measuring device comprises a level, a laser positioning tracker, laser positioning tracker accessories and a measuring tool, wherein: The level is used to calibrate the absolute level of the lower end surface of the primary collimator; The measuring tool comprises a base and a mounting bracket connected to the base, wherein the base is configured to be embedded and mounted in the barrel position; The laser positioning tracker accessory includes a first target ball and a second target ball. The measuring tool is vertically arranged during measurement. The first target ball and the second target ball are installed on the mounting bracket at intervals along the height direction. The laser positioning tracker is used to emit a laser beam and receive a reflected signal. The surfaces of the first target ball and the second target ball are both provided with a reflective layer for reflecting the laser beam back to the laser positioning tracker. The laser positioning tracker establishes communication with the first target ball and the second target ball through optical coupling to determine the position coordinates of the first target ball and the second target ball in three-dimensional space.

2. The collimator accuracy measuring device for radiotherapy equipment according to claim 1, characterized in that: The laser positioning tracker comprises: An optical receiver, used for receiving reflected signals from the first target ball and the second target ball; A processor is used to convert the reflection signal into an electrical signal and perform data processing to output the position information of the first target ball and the second target ball.

3. The collimator accuracy measuring device for radiotherapy equipment according to claim 1, characterized in that: The driving component is a stepping motor.

4. The collimator accuracy measuring device for radiotherapy equipment according to claim 1, characterized in that: The number of the barrel positions is 3, and the 3 barrel positions are evenly distributed on the circumference of the moving disk at an equal interval angle of 120°, and the central angle between adjacent barrel positions is 120°.

5. The collimator accuracy measuring device for radiotherapy equipment according to claim 1, characterized in that: The models of the secondary collimators are different from each other, and the first target ball and the second target ball have the same size and shape.

6. A method for measuring the accuracy of a collimator for radiotherapy equipment, characterized in that: The collimator accuracy measuring device for radiotherapy equipment according to any one of claims 1 to 5 is used, and the collimator accuracy measuring method comprises the following steps: Placing the level on the lower end surface of the primary collimator, calibrating the absolute level of the lower end surface of the primary collimator, and establishing the absolute horizontal plane of the primary collimator; using a laser positioning tracker to find the central axis of the primary collimator; the absolute horizontal plane is perpendicular to the central axis; The automatic switching mechanism of the secondary collimator is installed at the lower end of the primary collimator, and the measuring tool is embedded and installed in each of the cylinder positions in sequence; the moving disk is driven to rotate one circle by the driving assembly, and the parallelism of the trajectory circular surface formed by the rotation trajectory of the first target ball and / or the second target ball and the absolute horizontal plane is measured by the laser positioning tracker.

7. The method for measuring the accuracy of a collimator for radiotherapy equipment according to claim 6, characterized in that: The calculation method of the parallelism is: Calculating the vertical distance between each sampling point on each trajectory circular surface and the absolute horizontal plane; The difference between the maximum and minimum vertical distances is taken as the parallelism deviation; If the parallelism deviation is less than or equal to the preset threshold, it is determined that the installation of the secondary collimator meets the parallelism requirement.

8. The method for measuring the accuracy of a collimator for radiotherapy equipment according to claim 6, characterized in that: The collimator accuracy measurement method further comprises: Based on the measurement result of the parallelism, respectively adjust the position and angle of each barrel position; The coaxiality between each of the barrel positions and the central axis of the primary collimator is measured by the laser positioning tracker.

9. The method for measuring the accuracy of a collimator for radiotherapy equipment according to claim 8, characterized in that: The coaxiality of each barrel position and the central axis of the primary collimator is measured as follows: The rotation trajectory of the first target ball forms a first trajectory circular surface, and the rotation trajectory of the second target ball forms a second trajectory circular surface, and the center of the first trajectory circular surface and the center of the second trajectory circular surface are connected to form a concentric axis; calculating a distance and an angular deviation between the concentric axis and the central axis of the primary collimator; The position of each of the barrel positions is adjusted according to the calculation result so that the distance and angle deviation between the concentric axis and the central axis are within a preset threshold range.

10. The method for measuring the accuracy of a collimator for radiotherapy equipment according to claim 6, characterized in that: The diameter of the circular track surface formed by the rotation track of the first target ball is d1, and the diameter of the circular track surface formed by the rotation track of the second target ball is d2. The collimator accuracy measurement method includes: By comparing the diameter d1 and the diameter d2, the installation position deviation of each cylinder position is determined; By comparing the distances from the diameter d1 and the diameter d2 to the central axis, it is determined whether the eccentric distance between the primary collimator and the moving disk is within a preset tolerance range.

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