Proton beam energy quality control die body

Abstract

The utility model relates to the radiotherapy field, and specifically discloses a proton beam energy quality control die body, comprising a rack, a mobile adjusting mechanism and a wedge-shaped module assembly, the inner side of the rack is slidingly provided with a lifting seat, the mobile adjusting mechanism and the wedge-shaped module assembly are installed on the lifting seat, and the rack is provided with a lifting mechanism; the wedge-shaped module assembly comprises a base and a plurality of wedge-shaped modules detachably installed on the base, the wedge-shaped modules are different in height, an ionization chamber array is arranged in the base, the portion, located above the wedge-shaped module assembly, of the rack is provided with a proton treatment head, and the proton treatment head is connected with the ionization chamber array. The proton treatment head is used for emitting proton beams to the wedge-shaped module. According to the proton beam energy quality control die body disclosed by the utility model, the design of multiple groups of wedge-shaped modules is adopted, so that continuous depth dose distribution can be obtained through single irradiation, the efficiency of energy verification is greatly improved, and the requirement of repeated measurement is reduced.

Description

Technical Field

[0001] This utility model specifically relates to the field of radiotherapy, and specifically to a proton beam energy quality control phantom. Background Technology

[0002] In particle therapy, beam energy is a crucial parameter that determines the depth of radiation deposition within the patient's body. Even minute deviations in energy can lead to significant changes in particle range, resulting in the risk of insufficient tumor dose or excessive dose to surrounding normal tissue. This issue is particularly prominent in the increasingly prevalent pencil beam therapy. Proton therapy, as an advanced radiotherapy technique, fully utilizes the Bragg peak characteristics of proton beams to achieve precise irradiation of tumors. The range of the proton beam within human tissue directly affects the accuracy of treatment; therefore, regular and accurate monitoring of proton beam energy is a core aspect of quality assurance.

[0003] Commonly used methods for proton beam energy measurement mainly employ the ionization chamber method and the scintillator detector method. A scintillator detector is an instrument that uses the flashes of light produced by ionizing radiation in a scintillator for detection. It measures the proton beam energy by detecting photons generated by incident radiation in the scintillator and then converting them into electrical signals via photomultiplier tubes. However, the scintillator detector method is complex to operate and time-consuming, making it difficult to meet the efficiency requirements of clinical practice. Therefore, developing a proton beam energy measurement device that is simple in structure, easy to operate, and allows for rapid measurement has significant clinical importance and practical value. Utility Model Content

[0004] The purpose of this invention is to provide a proton beam energy quality control phantom to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A proton beam energy quality control phantom includes a frame, a movable adjustment mechanism, and a wedge-shaped module assembly. A lifting seat is slidably mounted on the inner side of the frame. The movable adjustment mechanism and the wedge-shaped module assembly are mounted on the lifting seat. The frame is provided with a lifting mechanism. The wedge-shaped module assembly includes a base and several wedge-shaped modules detachably mounted on the base. The heights of the wedge-shaped modules are different. An ionization chamber array is provided inside the base. A proton therapy head is provided above the wedge-shaped module assembly on the frame. The proton therapy head is used to emit a proton beam to the wedge-shaped module.

[0007] As a further embodiment of this invention: the wedge-shaped module assembly further includes a control module, which is used to acquire the irradiation signal captured by the ionization chamber array; the control module is also used to process the irradiation signal to obtain dose information generated by the proton beam.

[0008] As a further improvement of this utility model: the base of the wedge module assembly is provided with thirty wedge modules, each wedge module having a thickness of 3cm, and the wedge modules are made of PMMA material.

[0009] As a further embodiment of this utility model: the lifting mechanism includes a screw sleeve fixedly installed on the lifting seat and a lifting screw rotatably installed on the frame. The lifting screw is threadedly connected to the screw sleeve. A drive motor is also fixedly installed on the frame, and the output end of the drive motor is fixedly connected to the lifting screw.

[0010] As a further embodiment of this utility model: the movable adjustment mechanism includes an adjustment seat and a movable seat. At least two first guide rods and at least two second guide rods are provided on the inner side of the adjustment seat. The first guide rods and the second guide rods are slidably connected to the adjustment seat. The first guide rods are located above the second guide rods, and the first guide rods and the second guide rods are perpendicular to each other.

[0011] As a further embodiment of this utility model: the upper side of the movable seat is slidably connected to the first guide rod, the lower side of the movable seat is slidably connected to the second guide rod, and the adjusting seat is also provided with a first cylinder and a second cylinder for controlling the movement of the movable seat.

[0012] As a further embodiment of this utility model: a slider that cooperates with the second cylinder is slidably mounted on the movable seat, and the slider is slidably mounted in a guide groove opened on the movable seat. A slider that cooperates with the first cylinder is also slidably mounted on the movable seat.

[0013] Compared with existing technologies, the beneficial effects of this invention are as follows: The proton beam energy quality control phantom disclosed in this invention adopts a multi-set wedge-shaped module design, enabling continuous depth dose distribution to be obtained with a single irradiation, significantly improving the efficiency of energy verification and reducing the need for repeated measurements. This phantom is suitable for the clinically commonly used proton beam energy range of 70MeV to 215MeV, meeting the verification needs of tumor treatment at different depths, providing a reliable quality assurance means for proton therapy, and helping to improve the safety and accuracy of treatment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the proton beam energy quality control module.

[0015] Figure 2 This is a front view of the proton beam energy quality control module.

[0016] Figure 3 Schematic diagram of the moving adjustment mechanism and wedge-shaped module assembly in the proton beam energy quality control phantom. Figure 1 .

[0017] Figure 4 Schematic diagram of the moving adjustment mechanism and wedge-shaped module assembly in the proton beam energy quality control phantom. Figure 2 .

[0018] Figure 5 This is a schematic diagram of the wedge-shaped module assembly in the proton beam energy quality control phantom.

[0019] Figure 6 This is a side view of the wedge-shaped module component in the proton beam energy quality control phantom.

[0020] Figure 7 This is a top view of the wedge-shaped module assembly in the proton beam energy quality control phantom.

[0021] Figure 8 This is a schematic diagram of a wedge-shaped module irradiated by a proton beam in a proton beam energy quality control phantom.

[0022] In the diagram: 10-Frame, 11-Lifting seat, 12-Lifting screw, 13-Drive motor, 14-Screw sleeve, 15-Proton therapy head, 20-Moving adjustment mechanism, 21-Adjustment seat, 22-First guide rod, 23-Second guide rod, 24-First cylinder, 25-Second cylinder, 26-Moving seat, 27-Guide groove, 28-Slider, 30-Wedge module assembly, 31-Wedge module, 32-Base, 33-Positioning scale line. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-6In this embodiment of the invention, a proton beam energy quality control phantom includes a frame 10, a moving adjustment mechanism 20, and a wedge-shaped module assembly 30. A lifting seat 11 is slidably mounted on the inner side of the frame 10. The moving adjustment mechanism 20 and the wedge-shaped module assembly 30 are mounted on the lifting seat 11. The moving adjustment mechanism 20 is used to adjust the moving position of the wedge-shaped module assembly 30. A lifting mechanism is provided on the frame 10, which is used to adjust the height of the lifting seat 11, thereby adjusting the height of the wedge-shaped module assembly 30. The wedge-shaped module assembly 30 is adjusted by the moving adjustment mechanism 20 and the lifting mechanism. The spatial position allows the wedge module assembly 30 to obtain a preset measurement position; the wedge module assembly 30 includes a base 32 and several wedge modules 31 detachably mounted on the base 32. The heights of the several wedge modules 31 are different. An ionization chamber array is provided inside the base 32 (the ionization chamber array is hidden inside the base 32). The frame 10 is located above the wedge module assembly 30 and is equipped with a proton therapy head 15. The proton therapy head 15 is used to emit a proton beam to the wedge module 31. When the proton beam irradiates the wedge module 31, the ionization chamber array at the bottom captures the irradiation signal.

[0025] In this embodiment, the wedge-shaped module assembly 30 further includes a control module, which is used to acquire the irradiation signal captured by the ionization chamber array. The control module is also used to process the irradiation signal to obtain dose information generated by the proton beam, providing accurate and real-time data support for proton beam energy quality control. Furthermore, based on the above embodiments, the wedge-shaped module assembly 30 can also be equipped with a human-machine interface, which is connected to the control module and used to acquire and display dose information generated by the proton beam, ensuring efficient operation and convenient operation of the entire system.

[0026] It should be noted that when the proton beam passes through the ionization chamber array, it will ionize the air inside the ionization chamber, thereby generating a quantifiable current signal inside the ionization chamber. By analyzing the output current signal, the dose information generated by the incident particles can be obtained.

[0027] In this embodiment, the proton therapy head 15 employs a uniform field configuration, with the size and position of each sub-field corresponding to the cross-sectional size and position of the measurement wedge module 31 to ensure measurement accuracy and comprehensiveness. To ensure data consistency, each sub-field is set with a beam dose of 50 MU. In this embodiment, the base 32 of the wedge module assembly 30 is provided with thirty wedge modules 31, each wedge module 31 having a thickness of 3 cm. The wedge modules 31 are made of low atomic number materials such as PMMA (polymethyl methacrylate) to minimize scattering and secondary particle generation. In this embodiment, such as... Figure 7As shown, the wedge modules 31 are numbered from 1 to 30, corresponding to the measurement of proton beam energies from 70 MeV to 215 MeV, with the proton beam energy interval uniformly set to 5 MeV.

[0028] It should be noted that, as Figure 8 As shown, this application precisely adjusts the proton energy by changing the proton beam as it passes through wedge modules 31 of varying heights. When the proton beam passes through wedge modules 31 of different heights, it experiences different degrees of energy loss, resulting in proton beams with varying energies. This allows multiple sets of wedge modules 31 to ensure that proton beams of various energies can generate Bragg peaks within the effective measurement range of the detector, thereby achieving comprehensive and high-precision quality control of the proton beam energy.

[0029] As shown in Table 1, the wedge angle of each wedge module 31 is precisely calculated to cover the required energy range, ensuring that proton Bragg peaks of different energies fall within the effective measurement range of the detector.

[0030] Table 1 Geometric parameters of quality control modules for different proton beam energies

[0031]

[0032] In this embodiment, the lifting mechanism includes a screw sleeve 14 fixedly mounted on the lifting seat 11 and a lifting screw 12 rotatably mounted on the frame 10. The lifting screw 12 is threadedly connected to the screw sleeve 14. A drive motor 13 is also fixedly mounted on the frame 10. The output end of the drive motor 13 is fixedly connected to the lifting screw 12. The drive motor 13 is used to drive the lifting screw 12 to rotate, so that the lifting screw 12 controls the lifting seat 11 to move up and down along the frame 10 through the screw sleeve 14.

[0033] In this embodiment, the movable adjustment mechanism 20 includes an adjustment seat 21 and a movable seat 26. At least two first guide rods 22 and at least two second guide rods 23 are provided on the inner side of the adjustment seat 21. The first guide rods 22 and the second guide rods 23 are slidably connected to the adjustment seat 21. The first guide rods 22 are located above the second guide rods 23, and the first guide rods 22 and the second guide rods 23 are perpendicular to each other. The upper side of the movable seat 26 is slidably connected to the first guide rods 22, and the lower side of the movable seat 26 is slidably connected to the second guide rods 23. The adjustment seat 21 is also provided with a first cylinder 24 and a second cylinder 25 for controlling the movement of the movable seat 26.

[0034] Furthermore, in this embodiment of the application, a slider 28 that cooperates with the second cylinder 25 is slidably mounted on the movable seat 26. The slider 28 is slidably mounted in the guide groove 27 opened on the movable seat 26. It can be understood that a slider 28 that cooperates with the first cylinder 24 is also slidably mounted on the movable seat 26. The two sliders 28 are used to cooperate with the movement of the movable seat 26 in different directions.

[0035] Furthermore, in this embodiment, the base 32 is provided with positioning scale lines 33 on all four sides. The positioning scale lines 33 are used to calibrate the spatial position of the wedge module assembly 30. In practical applications, the quality control phantom needs to be placed on the proton therapy bed first, and the laser positioning system in the treatment room needs to be started at the same time. Then, the spatial position of the wedge module assembly 30 is adjusted so that the positioning scale lines 33 coincide and align with the laser positioning lines.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A proton beam energy quality control phantom, characterized in that, The assembly includes a frame (10), a moving adjustment mechanism (20), and a wedge module assembly (30). A lifting seat (11) is slidably installed on the inner side of the frame (10). The moving adjustment mechanism (20) and the wedge module assembly (30) are installed on the lifting seat (11). The frame (10) is provided with a lifting mechanism. The wedge module assembly (30) includes a base (32) and several wedge modules (31) that are detachably installed on the base (32). The heights of the several wedge modules (31) are different. An ionization chamber array is provided inside the base (32). A proton therapy head (15) is provided above the wedge module assembly (30) on the frame (10). The proton therapy head (15) is used to emit a proton beam to the wedge module (31).

2. The proton beam energy quality control phantom according to claim 1, characterized in that, The wedge-shaped module assembly (30) also includes a control module for acquiring the irradiation signal captured by the ionization chamber array; the control module is also used to process the irradiation signal to obtain dose information generated by the proton beam.

3. The proton beam energy quality control phantom according to claim 1, characterized in that, The wedge module assembly (30) has thirty wedge modules (31) on its base (32), each wedge module (31) is 3cm thick, and the wedge modules (31) are made of PMMA material.

4. The proton beam energy quality control phantom according to claim 1, characterized in that, The lifting mechanism includes a screw sleeve (14) fixedly installed on the lifting seat (11) and a lifting screw (12) rotatably installed on the frame (10). The lifting screw (12) is threadedly connected to the screw sleeve (14). A drive motor (13) is also fixedly installed on the frame (10). The output end of the drive motor (13) is fixedly connected to the lifting screw (12).

5. The proton beam energy quality control phantom according to claim 1, characterized in that, The movable adjustment mechanism (20) includes an adjustment seat (21) and a movable seat (26). The inner side of the adjustment seat (21) is provided with at least two first guide rods (22) and at least two second guide rods (23). The first guide rods (22) and the second guide rods (23) are slidably connected to the adjustment seat (21). The first guide rods (22) are located above the second guide rods (23), and the first guide rods (22) and the second guide rods (23) are perpendicular to each other.

6. The proton beam energy quality control phantom according to claim 5, characterized in that, The upper side of the movable seat (26) is slidably connected to the first guide rod (22), and the lower side of the movable seat (26) is slidably connected to the second guide rod (23). The adjusting seat (21) is also provided with a first cylinder (24) and a second cylinder (25) for controlling the movement of the movable seat (26).

7. The proton beam energy quality control phantom according to claim 6, characterized in that, The movable seat (26) is slidably mounted with a slider (28) that cooperates with the second cylinder (25). The slider (28) is slidably mounted in a guide groove (27) opened on the movable seat (26). The movable seat (26) is also slidably mounted with a slider (28) that cooperates with the first cylinder (24).

Images