Multifunctional medical electron linear accelerator quality control die body

Abstract

The utility model discloses a multifunctional medical electron linear accelerator quality control die body, and belongs to the technical field of radiotherapy equipment. The quality control die body comprises a die body counterweight platform, a die body and an ionization chamber adapter; the mold body is arranged on the side wall of the mold body counterweight platform, the mold body is of a cylindrical structure, vertical scale marks and first horizontal scale marks are arranged on the cylindrical side face of the mold body, and a film slot is formed in the mold body; an adapter matching cavity is formed in the end, away from the die body balance weight platform, of the die body. The adapter matching cavity is matched and connected with the ionization chamber adapter; and a high-density metal ball is arranged in the ionization chamber adapter. According to the utility model, the rotation concentricity of the accelerator rack, the rotation concentricity of the collimator, the stability of output doses at different rack angles, the consistency of the center of a radiation field and the center of a machine and the like are measured through one quality control die body, and the quality control efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of radiotherapy equipment, and in particular relates to a multifunctional medical electronic linear accelerator quality control phantom. Background Art

[0002] In the era of precision radiotherapy, quality control of the entire process of radiotherapy is crucial to ensure the accuracy, safety and effectiveness of treatment. As the main equipment for radiotherapy, the quality control of medical electron linear accelerator (hereinafter referred to as accelerator) plays a key role in ensuring the precise implementation of radiotherapy.

[0003] The content involved in accelerator quality control is quite complicated, including mechanical properties, dosimetric performance, image guidance and other aspects. This requires medical physicists to use a variety of quality control phantoms and equipment in quality control work to ensure the normal operation of the accelerator and the accuracy of radiotherapy. These quality control phantoms and equipment include mechanical performance quality control phantoms (such as mechanical stability phantoms, mechanical symmetry phantoms), dosimetric performance quality control phantoms (such as ionization chambers, electrometers, films, etc.), image guidance quality control phantoms (such as image quality assessment phantoms), etc. The diversity of quality control phantoms and equipment has brought certain inconveniences to the quality control work of medical physicists. Medical physicists need to be familiar with and understand the operating principles and usage methods of various quality control phantoms, and ensure their accuracy and reliability. In addition, maintaining and managing the status of these quality control phantoms and equipment also requires corresponding time and energy. Therefore, the research and development of multifunctional quality control phantoms has important application value. Summary of the invention

[0004] The embodiment of the utility model provides a multifunctional medical electronic linear accelerator quality control phantom, which aims to solve the problems that the content involved in accelerator quality control is quite complicated, and the diversity of quality control phantoms and equipment with different quality control contents brings inconvenience to the quality control work of medical physicists. The utility model simplifies the quality control process and improves efficiency by integrating multiple quality control measurement functions; by reducing the number of phantoms that quality control physicists need to use and operate, the phantom can conveniently meet the quality control needs of different types of accelerators.

[0005] The utility model embodiment is achieved in this way:

[0006] A multifunctional medical electron linear accelerator quality control phantom comprises: a phantom counterweight platform, a phantom body and an ionization chamber adapter; the phantom body is arranged on the side wall of the phantom counterweight platform, the phantom body is a cylindrical structure, the cylindrical side of the phantom body is provided with vertical scale lines and a first horizontal scale line, and the phantom body is provided with a film slot; an adapter matching cavity is provided at one end of the phantom body away from the phantom counterweight platform; the adapter matching cavity is matched and connected with the ionization chamber adapter; a high-density metal ball is provided in the ionization chamber adapter.

[0007] Further preferably, the lower plane of the mold counterweight platform is provided with a plurality of first leveling nuts, and the first leveling nuts are evenly distributed on the lower plane of the mold counterweight platform; by adjusting the first leveling nuts, the mold counterweight platform can be leveled. Preferably, there are four first leveling nuts, which are evenly distributed on the outside of the lower plane of the mold counterweight platform. Still further preferably, the side plane of the mold counterweight platform away from one end of the mold body is provided with a plurality of second leveling nuts, and the second leveling nuts are evenly distributed on the side plane of the mold counterweight platform; when the plane where the second leveling nuts are located is used as the supporting surface, the mold counterweight platform can be leveled by adjusting the second leveling nuts. Preferably, there are four second leveling nuts, which are evenly distributed on the outside of the side plane of the mold counterweight platform.

[0008] Further preferably, the phantom counterweight platform is preferably a cube structure. Through the cube structure of the phantom counterweight platform, the placement orientation of the multifunctional medical electron linear accelerator quality control phantom can be flexibly adjusted during use. It can be placed on the lower plane or on the side plane, thereby realizing different orientations of the phantom body and achieving different quality control contents.

[0009] Further preferably, the adapter matching cavity is matched with the ionization chamber adapter to be detachably connected.

[0010] Further preferably, a high-density metal ball is arranged at the center position in the ionization chamber adapter.

[0011] Preferably, a second horizontal scale line is provided on the side plane of the phantom counterweight platform. Preferably, the second horizontal scale line is flush with the first horizontal scale line.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model measures the accelerator frame rotation concentricity, collimator rotation concentricity, output dose stability at different frame angles, consistency between the radiation field isocenter and the mechanical isocenter, etc. through a quality control phantom. The use of the quality control phantom of the utility model can integrate traditional accelerator quality control items, thereby simplifying the entire quality control process and improving efficiency. Traditional accelerator quality control may require the use of different tools, equipment, and operating steps to complete each quality control item. This may cause the quality control process to be complicated, time-consuming, and prone to errors. However, by using the quality control phantom in the utility model, multiple quality control items can be integrated into one phantom, thereby simplifying the entire quality control process and improving efficiency; providing a more convenient and efficient method for accelerator quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the accelerator coordinates when the quality control phantom of the utility model is used;

[0015] Figure 2 This is a schematic diagram of the structure of the multifunctional medical electron linear accelerator quality control phantom of the utility model;

[0016] Figure 3 It is a front view of the multifunctional medical electron linear accelerator quality control phantom of the utility model;

[0017] Figure 4 It is a side structural schematic diagram of the ionization chamber adapter of the utility model. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0021] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0023] At present, there are problems such as the content involved in accelerator quality control is quite complicated, and the diversity of quality control phantoms and equipment for different quality control contents brings inconvenience to the quality control work of medical physicists. In order to solve the above technical problems, the utility model proposes a multifunctional medical electron linear accelerator quality control phantom.

[0024] Example

[0025] like Figure 2 As shown, a multifunctional medical electron linear accelerator quality control phantom 1 includes: a phantom counterweight platform 11, a phantom body 12 and an ionization chamber adapter 13; the phantom body 12 is arranged on the side wall of the phantom counterweight platform 11, the phantom body 12 is a cylindrical structure, and the cylindrical side of the phantom body 12 is provided with vertical scale lines 121 and a first horizontal scale line 122, and the phantom body 11 is provided with a film slot 123; an adapter matching cavity 124 is provided at one end of the phantom body 12 away from the phantom counterweight platform 11; the adapter matching cavity 124 is matched and connected with the ionization chamber adapter 13; a high-density metal ball is provided in the ionization chamber adapter 13.

[0026] Further preferably, the lower plane of the mold counterweight platform 11 is provided with a plurality of first leveling nuts 111, and the first leveling nuts 111 are evenly distributed on the lower plane of the mold counterweight platform 11; by adjusting the first leveling nuts 111, the mold counterweight platform 11 is leveled. The first leveling nuts 111 are preferably four, evenly distributed on the outside of the lower plane of the mold counterweight platform 11. Further preferably, the side plane of the mold counterweight platform 11 away from one end of the mold body 12 is provided with a plurality of second leveling nuts 112, and the second leveling nuts 112 are evenly distributed on the side plane of the mold counterweight platform 11; when the plane where the second leveling nuts 112 are located is used as the supporting surface, the mold counterweight platform 11 is leveled by adjusting the second leveling nuts 112. The second leveling nuts 112 are preferably four, evenly distributed on the outside of the side plane of the mold counterweight platform 11.

[0027] Further preferably, the phantom counterweight platform 11 is preferably a cube structure. Through the cube structure of the phantom counterweight platform 11, the placement orientation of the multifunctional medical electron linear accelerator quality control phantom can be flexibly adjusted during use. It can be placed on the lower plane or on the side plane, thereby realizing different orientations of the phantom body and achieving different quality control contents.

[0028] Further preferably, the adapter matching cavity 124 matches and is detachably connected to the ionization chamber adapter 13 .

[0029] like Figure 4 As shown, further preferably, a high-density metal ball is arranged at the center position of the ionization chamber adapter 13.

[0030] Further preferably, a second horizontal scale line 113 is provided on the side plane of the phantom counterweight platform 11. Still further preferably, the second horizontal scale line 113 is flush with the first horizontal scale line 122.

[0031] like Figure 1 The accelerator coordinate diagram of the quality control phantom when it is used is shown; the quality control phantom 1 is placed on the treatment bed 4, the collimator 3 at the upper end of the frame 2 corresponds to the quality control phantom 1, and Figure 1 Contains the direction information of the accelerator coordinate XYZ axis.

[0032] The multifunctional medical electron linear accelerator quality control phantom of the utility model realizes different quality control contents and is used as follows:

[0033] (a) Measuring the concentricity of the rack rotation: The plane on the side where the phantom body 12 of the quality control phantom is located (such as Figure 3 The plane of the front view) is placed horizontally toward the positive direction of the Y axis of the accelerator coordinate system. The first leveling nut 111 is connected to the treatment bed 4, and the concentricity of the gantry rotation can be measured. The specific implementation is as follows: (1) Rotate the gantry 2 and the collimator 3 to 0°; (2) Place the film vertically in the film slot 123, and ensure that the plane where the film is located is parallel to the rotation plane of the gantry 2. At the same time, the center of the film should be located near the rotation center of the accelerator; (3) Set the opening width of the X-direction collimator to between 0.1cm and 0.6cm, and the width of the Y-direction collimator to 30cm. Set the gantry angle to 0°, 60°, 120°, 150°, 210° and 270° in turn, and irradiate the film to form a star-shaped field shape on the film; (4) Perform optical density analysis on the exposed film to obtain the position of the long axis of each field on the film; (5) Measure the radius of the inscribed circle of each long axis intersection in the film and compare it with the reference value.

[0034] (b) Measuring the rotation concentricity of the collimator: The plane on the side where the phantom body 12 of the quality control phantom is located (such as Figure 3 The plane of the front view) faces upward, and the second leveling nut 112 is connected to the treatment bed 4, so that the concentricity of the frame rotation can be measured. The specific implementation is as follows: (1) Rotate the frame 2 and the collimator 3 to 0°; (2) Place the film horizontally in the film slot 123, with the source-to-film distance of 100 cm, set the opening width of the X-direction collimator between 0.1 cm and 0.6 cm, the Y-direction collimator width of 30 cm, and irradiate the film when the collimator angles are 300°, 330°, 0°, 30°, 60° and 90°, respectively, to form a star-shaped field shape on the film; (4) Perform optical density analysis on the film to obtain the position of the long axis of each field on the film; (5) Measure the radius of the inscribed circle of each long axis intersection in the film and compare it with the reference value.

[0035] (c) Measuring the stability of the output dose at different gantry angles: The plane on the side where the phantom body 12 of the quality control phantom is located (eg Figure 3 The plane of the front view) is placed horizontally toward the negative direction of the Y axis of the accelerator coordinate system. The first leveling nut 111 is connected to the treatment bed 4, and the stability of the output dose at different gantry angles can be measured. The specific implementation is as follows: (1) The collimator 3 is rotated to 0°, the field size is 10 cm×10 cm, and the distance from the source to the ionization chamber is 100 cm; (2) The ionization chamber is placed at the mechanical isocenter of the accelerator through the ionization chamber adapter 13; (3) 100 cGy is irradiated at gantry angles of 0°, 90°, 180° and 270°, and the dose readings are recorded; (4) The dose readings at gantry angles of 90°, 180° and 270° are compared with the dose readings at gantry angles of 0°.

[0036] (d) Measuring the consistency between the image isocenter and the mechanical isocenter: The plane on the side where the phantom body 12 of the quality control phantom is located (such as Figure 3 The plane of the front view is placed horizontally toward the negative direction of the Y axis of the accelerator coordinate system. The first leveling nut 111 is connected to the treatment bed 4, and the consistency between the image isocenter and the mechanical isocenter can be measured. The specific implementation is as follows: (1) Align the marking scale line of the layer where the high-density metal ball 131 is located with the laser line; (2) Scan the high-density metal ball through the accelerator-mounted cone beam CT to obtain KV images at 0° and 90°, obtain the position of the image center through the image analysis software, calculate the position deviation between the image center and the mechanical center, and compare it with the reference value.

[0037] Compared with the prior art, the utility model has the following beneficial effects:

[0038] The utility model measures the accelerator frame rotation concentricity, collimator rotation concentricity, output dose stability at different frame angles, consistency between the radiation field isocenter and the mechanical isocenter, etc. through a quality control phantom. The use of the quality control phantom of the utility model can integrate traditional accelerator quality control items, thereby simplifying the entire quality control process and improving efficiency. Traditional accelerator quality control may require the use of different tools, equipment, and operating steps to complete each quality control item. This may cause the quality control process to be complicated, time-consuming, and prone to errors. However, by using the quality control phantom in the utility model, multiple quality control items can be integrated into one phantom, thereby simplifying the entire quality control process and improving efficiency; providing a more convenient and efficient method for accelerator quality control.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multifunctional medical electron linear accelerator quality control phantom, characterized in that: include: A phantom counterweight platform, a phantom body and an ionization chamber adapter; the phantom body is arranged on the side wall of the phantom counterweight platform, the phantom body is a cylindrical structure, the cylindrical side of the phantom body is provided with vertical scale lines and a first horizontal scale line, and the phantom body is provided with a film slot; an adapter matching cavity is provided at one end of the phantom body away from the phantom counterweight platform; the adapter matching cavity is matched and connected with the ionization chamber adapter; a high-density metal ball is provided in the ionization chamber adapter.

2. The multifunctional medical electron linear accelerator quality control phantom according to claim 1, characterized in that: A plurality of first leveling nuts are arranged on the lower plane of the mold body counterweight platform, and the first leveling nuts are evenly distributed on the lower plane of the mold body counterweight platform.

3. The multifunctional medical electron linear accelerator quality control phantom according to claim 2, characterized in that: There are four first leveling nuts, which are evenly distributed on the outer side of the lower plane of the mold body counterweight platform.

4. The multifunctional medical electron linear accelerator quality control phantom according to claim 1, characterized in that: A plurality of second leveling nuts are arranged on a side plane of the mold body counterweight platform away from one end of the mold body main body, and the second leveling nuts are evenly distributed on the side plane of the mold body counterweight platform.

5. The multifunctional medical electron linear accelerator quality control phantom according to claim 4, characterized in that: There are four second leveling nuts, which are evenly distributed on the outside of the side plane of the mold body counterweight platform.

6. The multifunctional medical electron linear accelerator quality control phantom according to claim 1, characterized in that: The phantom counterweight platform is a cube structure.

7. The multifunctional medical electron linear accelerator quality control phantom according to claim 1, characterized in that: The adapter matching cavity is matched with the ionization chamber adapter and is detachably connected.

8. The multifunctional medical electron linear accelerator quality control phantom according to claim 1, characterized in that: A high-density metal ball is arranged at the center of the ionization chamber adapter.

9. The multifunctional medical electron linear accelerator quality control phantom according to claim 1, characterized in that: A second horizontal scale line is arranged on the side plane of the phantom counterweight platform.

10. The multifunctional medical electron linear accelerator quality control phantom according to claim 9, characterized in that: The second horizontal scale line is flush with the first horizontal scale line.

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