Non-uniform die body for radiotherapy dose verification

Abstract

The utility model discloses a non-uniform die body used for radiotherapy dose verification, firstly, the non-uniform die body mainly comprises a die assembly and a supporting assembly, secondly, the supporting assembly comprises a supporting seat and a supporting beam, the supporting seat is mainly used for fixing the die assembly so as to prevent the die body assembly from transversely moving when the die body assembly rotates, and the supporting beam is used for supporting the die body assembly. In order to guarantee the supporting effect of the mold body, a supporting beam is further arranged between the two supporting bases, the final model assembly comprises a fixing part, a film used for dose measurement and verification is horizontally inserted in the center of the axis of the fixing part, and the film is placed at the horizontal position of the center axis of the fixing part. In this way, it can be ensured that the dose distribution received by the film is an accurate representation of the dose distribution in the treatment plan, in the radiotherapy dose distribution, the central area is usually the area with the highest and most uniform dose, and therefore measurement can provide the most accurate dose verification data.

Description

Technical Field

[0001] This invention relates to the field of non-uniform phantom technology, and more specifically, to a non-uniform phantom for radiotherapy dose verification. Background Technology

[0002] Validation of radiotherapy dose is typically performed before the patient’s first treatment by using an ionization chamber matrix, film, or other dose measurement equipment, in conjunction with a phantom, to measure the actual dose and compare it with the planned dose.

[0003] Phantoms are tools used to simulate tissues of different densities inside the human body. In radiation dose validation, they are used to assess the dose distribution of a radiation therapy plan in complex anatomical structures. These phantoms typically contain a variety of materials, such as water, polyethylene, and plastics, to mimic the density and electronic properties of different tissues in the human body.

[0004] Currently, in stereotactic radiotherapy using phantoms, dose resolution is affected by longitudinal and lateral orientation, which can easily lead to insufficient accuracy in dose distribution determination and thus does not meet existing requirements. To address this, we propose a non-uniform phantom for radiotherapy dose verification. Utility Model Content

[0005] The purpose of this invention is to provide a non-uniform phantom for radiotherapy dose verification, in order to solve the problem that in the current stereotactic radiotherapy process using phantoms, dose resolution is affected by longitudinal and lateral orientation, which easily leads to insufficient accuracy in dose distribution determination.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a non-uniform phantom for radiotherapy dose verification, comprising: a phantom assembly, the phantom assembly including a fixing component rotatably disposed on a support assembly, the fixing component being cylindrical in shape, a film for dose measurement and verification being horizontally inserted at the center of the axis of the fixing component, and a plurality of ionization detection devices for measuring ionizing radiation being inserted on the fixing component; a support assembly, the support assembly including a pair of spaced-apart support seats, a support beam for supporting the phantom assembly being disposed between the two support seats, and the side of the two support seats and the support beam away from the ground abutting against the outer edge of the fixing component.

[0007] By adopting the above technical solution, the non-uniform model firstly mainly includes a model assembly and a support assembly. Secondly, the support assembly includes a support base and a support beam. The support base is mainly used to fix the model assembly to prevent the model assembly from moving laterally when rotating. In addition, to ensure the support effect of the model, a support beam is also provided between the two support bases. Finally, the model assembly includes a fixing component, and a film for dose measurement and verification is horizontally inserted at the center of the axis of the fixing component. The film is placed at the horizontal position of the central axis of the fixing component, which can ensure that the dose distribution received by the film is an accurate representation of the dose distribution in the treatment plan. In the radiotherapy dose distribution, the central region is usually the region with the highest and most uniform dose. Therefore, measuring here can provide the most accurate dose verification data.

[0008] The present invention is further configured such that: the mold component includes two interlocking semi-cylinders, and the two semi-cylinders are fastened together by bolts.

[0009] By adopting the above technical solution, the fastening effect of the two semi-cylinders is improved, and the two semi-cylinders are prevented from becoming loose.

[0010] The present invention is further configured such that: after the two semi-cylinders are interlocked, a square groove for inserting the film is formed inside, and the film is inserted into the square groove.

[0011] By adopting the above technical solution, the square groove can ensure that the film is uniformly fixed in the phantom, thereby obtaining consistent dose distribution data in different directions. This is crucial for the accuracy of dose verification. Furthermore, it is physically stable, ensuring that the structure of the phantom will not deform during radiotherapy, thus affecting the dose distribution measurement results.

[0012] The present invention is further configured such that: each of the support bases has an arc surface on the side away from the ground for limiting the fixing component, and a limit component is provided on the arc surface.

[0013] By adopting the above technical solution, the fixing effect of the fixed mold assembly is improved.

[0014] The present invention is further configured such that: the limiting component includes a fixed shell disposed on the arc surface for limiting the longitudinal position movement of the semi-cylinder; a first rotating shaft is rotatably disposed inside the fixed shell; a driving plate is fixedly disposed on the rotating shaft; a transmission plate for driving the driving plate is rotatably disposed at one end of the driving plate away from the arc surface; a second rotating shaft is rotatably disposed at one end of the transmission plate facing the semi-cylinder; both ends of the second rotating shaft are provided with limiting pins, and each limiting pin can be inserted into the semi-cylinder; a spring is sleeved on the outer edge of the second rotating shaft.

[0015] By adopting the above technical solution, the fixation effect of the mold components is improved.

[0016] The present invention is further configured such that a fixing plate for fixing the spring is fixedly provided at one end of the limiting pin near the second rotating shaft.

[0017] By adopting the above technical solution, the fixing effect between the spring and the limiting pin is improved.

[0018] The present invention is further configured such that: the end face of the fixing component is provided with a plurality of ionization detection devices that can be inserted in a linear array.

[0019] By adopting the above technical solutions, the design of linear array ionization detection devices is generally insensitive to changes in dose rate. This means that the ionization chamber can provide stable dose readings under different treatment conditions, which is especially important for dynamically changing treatment plans.

[0020] The present invention is further configured such that a plurality of the ionization detection devices are inserted into the end face of the fixing component in a linear array and are parallel to the film.

[0021] By adopting the above technical solution, the film and ionization chamber can provide directly corresponding dose distribution data, which facilitates subsequent analysis and comparison, especially when looking for deviations and inconsistencies in dose distribution.

[0022] In summary, this utility model has the following beneficial effects: First, the non-uniform model mainly includes a model assembly and a support assembly. Second, the support assembly includes a support base and a support beam. The support base is mainly used to fix the model assembly to prevent the model assembly from moving laterally when rotating. In addition, to ensure the support effect of the model, a support beam is also provided between the two support bases. Finally, the model assembly includes a fixing component, and a film for dose measurement and verification is horizontally inserted at the center of the axis of the fixing component. The film is placed at the horizontal position of the central axis of the fixing component, which can ensure that the dose distribution received by the film is an accurate representation of the dose distribution in the treatment plan. In the radiotherapy dose distribution, the central region is usually the region with the highest and most uniform dose. Therefore, measurement here can provide the most accurate dose verification data. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a non-uniform phantom used for radiotherapy dose verification in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the fixing component and the fixing component in the embodiment of this utility model;

[0025] Figure 3This is a cross-sectional view of a non-uniform phantom used for radiotherapy dose verification in an embodiment of this utility model.

[0026] In the picture:

[0027] 1. Semi-cylinder;

[0028] 2. Limiting beam;

[0029] 3. Support base;

[0030] 4. Ionization detection device;

[0031] 5. Limiting component; 51. First rotating shaft; 52. Second rotating shaft; 53. Transmission plate; 54. Drive plate; 55. Limiting pin. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1 —3 provides a further detailed description of this utility model.

[0033] Example

[0034] like Figures 1-3 As shown, a non-uniform phantom for radiotherapy dose verification includes a phantom assembly and a support assembly.

[0035] The support assembly includes a pair of spaced-apart support seats 3, with a support beam between the two support seats 3 for supporting the mold assembly. The support beam is fixed to the two support seats 3 by bolts to improve the overall assembly and disassembly effect of the support assembly. The two support seats 3 and the support beam abut against the outer edge of the fixing component on the side away from the ground. The fixing component rotates on the two support seats 3 with a rotation angle range of 360°.

[0036] The support base 3 is fixed to the ZAP-X treatment bed with bolts and needs to be placed according to the pattern of the high-energy ray beam of the ZAP-X treatment bed to ensure that the phantom placed on the ZAP-X is at a 45° angle to the ZAP-X. This ensures that the ZAP-X system has unique technical advantages, including a dual rotation axis design with a 45-degree angle. This design can achieve a larger treatment area, which can improve the treatment effect of the target area lesion while further reducing the radiation dose of the surrounding normal tissue and shortening the patient's treatment time.

[0037] ZAP-X is an innovative stereotactic radiosurgery (SRS) treatment system designed specifically for the treatment of craniocerebral and head and neck lesions.

[0038] Each support 3 has an arc surface on the side away from the ground to limit the movement of the fixed component. The arc surface cooperates with the outer edge of the fixed component to limit the lateral movement of the fixed component and prevent the fixed component from deviating from its position when it rotates. Each support 3 has a limiting component 5 on its arc surface to limit the longitudinal movement of the fixed component.

[0039] The limiting component 5 includes a fixed shell disposed on the arc surface to limit the longitudinal position movement of the semi-cylinder 1. A first rotating shaft 51 for limiting the position of the drive plate is rotatably disposed inside the fixed shell. A drive plate is rotatably disposed on the first rotating shaft 51. A transmission plate 53 for driving the drive plate is rotatably disposed at the end of the drive plate away from the arc surface. A second rotating shaft 52 is rotatably disposed at the end of the transmission plate 53 facing the semi-cylinder 1. Limiting pins 55 are provided at both ends of the second rotating shaft 52, and each limiting pin 55 can be inserted into the semi-cylinder 1. A spring for providing the return of the limiting pin 55 is sleeved on the outer edge of the second rotating shaft 52. A fixing plate for fixing the spring is fixedly disposed at the end of the limiting pin 55 near the second rotating shaft 52.

[0040] The end face of the fixing component is provided with a number of ionization detection devices 4 in a linear array. The number of ionization detection devices 4 are inserted into the end face of the fixing component in a linear array and are parallel to the film.

[0041] The ionization detection device 4 is an ionization chamber.

[0042] The ionization detection device 4 employs a linear array arrangement to provide measurements of two-dimensional dose distribution, which is particularly important for high-precision treatment techniques such as radiotherapy (IMRT) and stereotactic radiotherapy (SRS). Ionization chambers in a linear array typically have good dose linearity and repeatability, meaning that the ionization chamber can provide consistent and accurate readings at different doses and dose rates. Furthermore, the design of linear array ionization chambers typically makes them insensitive to changes in dose rate, which means that the ionization chamber can provide stable dose readings under different treatment conditions, which is particularly important for dynamically changing treatment plans.

[0043] The ionization detection device 4 measures the absolute dose, while the film provides a relative dose distribution. By placing them in parallel, the results of these two measurement methods can be compared, thus obtaining more comprehensive dose verification information. Furthermore, the parallel placement of the film and ionization chamber provides directly corresponding dose distribution data, facilitating subsequent analysis and comparison, especially when identifying deviations and inconsistencies in the dose distribution.

[0044] The ionization detection device 4 is primarily an ionization chamber, a gas detector that detects ionizing radiation. Its working principle is based on the interaction between particle radiation and gas molecules. By measuring the current generated by an ionization event, it indirectly measures the magnitude of the radiation energy. Secondly, in radiotherapy, the ionization chamber can be used to verify the dose distribution of the treatment plan, ensuring the accuracy and safety of the treatment. By multiplying the readings measured by the ionization chamber by a calibration factor and other correction factors, the absorbed dose can be obtained. Finally, the ionization chamber can measure the dose rate of ionizing radiation, i.e., the radiation dose per unit time. This is particularly important for dynamically changing treatment plans.

[0045] If point dose measurement and point dose verification are required, the ionization detection device 4 is inserted into the semi-cylinder 1. If point dose verification is not required, insert a rod of the same size and material to fill the gap.

[0046] The phantom assembly includes a rotatable fixing component mounted on the support assembly. The fixing component is cylindrical in shape, and a film for dose measurement and verification is horizontally inserted at the center of the fixing component's axis. Several ionization detection devices 4 for measuring ionizing radiation are also inserted into the fixing component.

[0047] The mold body component includes two interlocking semi-cylinders 1, and the two semi-cylinders 1 are fastened together by bolts.

[0048] After the two semi-cylinders 1 are interlocked, a square groove is formed inside for inserting the film. The film is inserted into the square groove.

[0049] The two semi-cylinders 1, when joined together, form a multi-layered ring shape in cross-section, with a certain interval between each layer, to enable precise measurement and verification of the dose distribution of the radiotherapy equipment. These multi-layered rings are made of high-density materials that can absorb and attenuate radiation, thus simulating the absorption effect of human tissue on radiation.

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

Claims

1. A non-uniform phantom for radiotherapy dose verification, characterized in that, include: The phantom assembly includes a rotatable fixing component mounted on a support assembly. The fixing component is cylindrical in shape. A film for dose measurement and verification is horizontally inserted at the center of the axis of the fixing component. Several ionization detection devices for measuring ionizing radiation (4) are also inserted on the fixing component. The support assembly includes a pair of spaced-apart support seats (3), and a support beam for supporting the mold assembly is provided between the two support seats (3). The two support seats (3) and the support beam abut against the outer edge of the fixing component on the side away from the ground.

2. The non-uniform phantom for radiotherapy dose verification according to claim 1, characterized in that, The mold assembly includes two interlocking semi-cylinders (1), and the two semi-cylinders (1) are fastened together by bolts.

3. A non-uniform phantom for radiotherapy dose verification according to claim 2, characterized in that, After the two semi-cylinders (1) are interlocked, a square groove is formed inside for inserting the film, and the film is inserted into the square groove.

4. A non-uniform phantom for radiotherapy dose verification according to any one of claims 1-3, characterized in that, Each of the support bases (3) has an arc surface on the side away from the ground for limiting the fixing component, and a limit component (5) is provided on the arc surface.

5. A non-uniform phantom for radiotherapy dose verification according to claim 4, characterized in that, The limiting component (5) includes a fixed shell disposed on the arc surface for limiting the longitudinal position movement of the semi-cylinder (1). A first rotating shaft is rotatably disposed inside the fixed shell. A drive plate is fixedly disposed on the rotating shaft. A transmission plate (53) for driving the drive plate is rotatably disposed at the end of the drive plate away from the arc surface. A second rotating shaft (52) is rotatably disposed at the end of the transmission plate (53) facing the semi-cylinder (1). Limiting pins (55) are disposed at both ends of the second rotating shaft (52), and each limiting pin (55) can be inserted into the semi-cylinder (1). A spring is sleeved on the outer edge of the second rotating shaft (52).

6. A non-uniform phantom for radiotherapy dose verification according to claim 5, characterized in that, The limiting pin (55) is fixedly provided with a fixing plate for fixing the spring at one end near the second rotating shaft (52).

7. A non-uniform phantom for radiotherapy dose verification according to claim 1, characterized in that, The end face of the fixed component can be arranged in a linear array to insert several of the ionization detection devices (4).

8. A non-uniform phantom for radiotherapy dose verification according to claim 7, characterized in that, Several of the ionization detection devices (4) are inserted into the end face of the fixed component in a linear array and are parallel to the film.

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