Proton treatment plan three-dimensional dose verification device

Abstract

The utility model relates to the technical field of medical physics, and discloses a proton treatment plan three-dimensional dose verification device, which comprises a three-dimensional moving platform and a verification mechanism, the three-dimensional moving platform comprises a first moving mechanism, a second moving mechanism, a fixed seat and a mounting seat, and the verification mechanism comprises a die body, a detector and a data processing module. And a plurality of detectors are uniformly distributed in the mold body. The proton treatment plan three-dimensional dose verification device disclosed by the utility model can acquire complete three-dimensional space dose distribution information, and performs comparative analysis on acquired three-dimensional dose distribution data for measuring a proton treatment plan and dose distribution calculated by a treatment plan system; by calculating the difference between the measured dose and the calculated dose, the dose accuracy of the treatment plan can be comprehensively evaluated, a reliable guarantee is provided for accurate implementation of clinical proton treatment, the treatment accuracy is ensured, and the accuracy and comprehensiveness of dose verification are remarkably improved.

Description

Technical Field

[0001] This utility model specifically relates to the field of medical physics technology, and specifically to a three-dimensional dose verification device for proton therapy plans. Background Technology

[0002] Proton therapy is an advanced radiotherapy technique characterized by its ability to concentrate the dose on the tumor target area while minimizing damage to surrounding normal tissues. However, the dose distribution of the proton beam is affected by various factors, such as changes in tissue density and organ movement within the patient. Therefore, accurately measuring the three-dimensional dose distribution of the proton beam is crucial for ensuring the quality of treatment.

[0003] Currently used dose verification methods include two-dimensional ionization chamber arrays and radiation-sensitive films, but these methods struggle to obtain complete three-dimensional dose distribution information. While chemical gel dosimeters can measure the three-dimensional dose distribution of protons, their fabrication is complex and requires specialized readout equipment. Therefore, developing a simple and reliable three-dimensional proton dose verification phantom is of great significance. Utility Model Content

[0004] The purpose of this invention is to provide a three-dimensional dose verification device for proton therapy planning, so as 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 three-dimensional dose verification device for proton therapy planning includes a three-dimensional moving platform and a verification mechanism. The three-dimensional moving platform includes a first moving mechanism, a second moving mechanism, a fixed base, and a mounting base. The first and second moving mechanisms have identical structures. The first moving mechanism includes a first moving base and a driving component disposed on the first moving base. The first moving base has two guide grooves. The driving component includes a moving screw rotatably mounted inside the guide groove and a moving sleeve slidably mounted inside the guide groove. The moving sleeve is threadedly connected to the moving screw. The second moving mechanism is mounted on the moving sleeve. The mounting base is mounted on the second moving mechanism, and a telescopic component is fixedly mounted on the mounting base. The output end of the telescopic component is connected to the fixed base. The verification mechanism is disposed on the mounting base and includes a phantom, detectors, and a data processing module. The phantom has multiple ionization layers inside, and multiple detectors are evenly distributed in each ionization layer.

[0007] As a further embodiment of this utility model: a first motor is fixedly installed on one side of the first movable seat, the output end of the first motor is fixedly connected to one of the movable screws, and pulleys are installed at the ends of both movable screws, and the two pulleys are connected by a synchronous belt drive.

[0008] As a further improvement of this utility model, the fixed base and the mounting base are connected by multiple spring rods.

[0009] As a further embodiment of this invention, the verification mechanism further includes a frame, which is installed at the end of the mold.

[0010] As a further improvement of this utility model: four fixing blocks are symmetrically arranged on the fixing base, and the bottom of the fixing blocks is rotatably mounted on the fixing base via a rotating rod. The fixing blocks are provided with an arc-shaped surface that matches the shape of the frame.

[0011] As a further embodiment of this utility model: a through groove is provided on the fixed base at the position of the fixed block, and a connecting seat is installed at the lower end of the fixed block. The connecting seat is fixedly connected to the rotating rod. Two rotating rods are symmetrically arranged at the bottom of the fixed base and rotate synchronously. A second motor is fixedly installed on the fixed base, and the output end of the second motor is fixedly connected to one of the rotating rods.

[0012] As a further embodiment of this invention: the detector is used to measure the proton beam dose, and the data processing module includes a data processing unit and a user interface, wherein:

[0013] The data processing unit is electrically connected to the detector. The data processing unit is used to receive detector data and reconstruct a three-dimensional dose distribution map. At the same time, it compares and analyzes the reconstructed three-dimensional dose distribution map with the preset treatment plan dose distribution to obtain the analysis results.

[0014] The user interface is communicatively connected to the data processing unit and is used to display a three-dimensional dose distribution map and analysis results.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The three-dimensional dose verification device for proton therapy plans disclosed in this utility model can acquire complete three-dimensional spatial dose distribution information, compare and analyze the acquired three-dimensional dose distribution data of the measured proton therapy plan with the dose distribution calculated by the treatment plan system; by calculating the difference between the measured dose and the calculated dose, the dose accuracy of the treatment plan can be comprehensively evaluated, providing a reliable guarantee for the precise implementation of clinical proton therapy, ensuring the accuracy of treatment, and significantly improving the accuracy and comprehensiveness of dose verification. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a three-dimensional dose verification device for proton therapy planning.

[0017] Figure 2 This is a schematic diagram of the structure of a three-dimensional dose verification device for proton therapy planning, excluding the verification mechanism.

[0018] Figure 3 A side view of a three-dimensional dose verification device for proton therapy planning.

[0019] Figure 4 This is a schematic diagram of the mounting base in a three-dimensional dose verification device for proton therapy planning.

[0020] Figure 5 This is a cross-sectional view of the fixture in a three-dimensional dose verification device for proton therapy planning.

[0021] Figure 6 This is a schematic diagram of the verification mechanism in a three-dimensional dose verification device for proton therapy planning.

[0022] In the figure: 10-First moving mechanism, 11-First moving seat, 12-Guide groove, 13-First motor, 14-Synchronous belt, 20-Second moving mechanism, 30-Fixed seat, 31-Fixed block, 32-Elastic block, 33-Second motor, 34-Rotating rod, 35-Connecting seat, 40-Verification mechanism, 41-Phantom, 42-Detector, 43-Frame, 50-Mounting seat, 51-Telescopic component, 52-Spring rod. 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 1-6 In this embodiment of the invention, a three-dimensional dose verification device for proton therapy planning includes a three-dimensional moving platform and a verification mechanism 40. The three-dimensional moving platform includes a first moving mechanism 10, a second moving mechanism 20, a fixed base 30, and a mounting base 50. The first moving mechanism 10 and the second moving mechanism 20 have identical structures. The first moving mechanism 10 is arranged along the x-axis direction, i.e., as shown... Figure 1 As shown, the second moving mechanism 20 is arranged along the y-axis direction, that is, as... Figure 1As shown, the second moving mechanism 20 is perpendicular to the first moving mechanism 10. The first moving mechanism 10 includes a first moving base 11 and a driving assembly disposed on the first moving base 11. The first moving base 11 has two guide grooves 12. The driving assembly includes a moving screw rotatably mounted inside the guide groove 12 and a moving sleeve slidably mounted inside the guide groove 12. The moving sleeve is threadedly connected to the moving screw. The second moving mechanism 20 is mounted on the moving sleeve. When the moving screw is rotating, it drives the moving sleeve to slide along the guide groove 12, thereby driving the second moving mechanism 20 to slide. The mounting base 50 is mounted on the second moving mechanism 20. The second moving mechanism 20 is used to drive the mounting base 50 to move along the y-axis direction. The mounting base 50 is fixedly equipped with a telescopic component 51, the output end of which is connected to the fixed base 30. The telescopic component 51 is used to control the fixed base 30 to move along the z-axis. The verification mechanism 40 is disposed on the mounting base 50. It can be understood that the three-dimensional moving platform controls the verification mechanism 40 to move along the x-axis through the first moving mechanism 10, and controls the verification mechanism 40 to move along the y-axis through the second moving mechanism 20. Finally, it controls the verification mechanism 40 to move along the z-axis through the telescopic component 51, so that the verification mechanism 40 can be freely adjusted in three-dimensional space, so that the isocenter of the verification mechanism 40 coincides with the isocenter of the treatment, so as to accurately obtain the three-dimensional dose distribution data of the proton therapy plan measured in the verification mechanism 40.

[0025] Furthermore, in this embodiment of the application, a first motor 13 is fixedly installed on one side of the first movable base 11, and the output end of the first motor 13 is fixedly connected to one of the movable screws. The first motor 13 is used to drive the movable screw to rotate. Both movable screws are equipped with pulleys at their ends, and the two pulleys are connected by a synchronous belt 14 to drive the two movable screws to rotate synchronously.

[0026] In this embodiment, the fixed base 30 and the mounting base 50 are connected by multiple spring rods 52. When the telescopic end of the telescopic component 51 extends, the spring rods 52 extend synchronously. When the telescopic end of the telescopic component 51 shortens, the spring rods 52 compress synchronously. The purpose of setting the spring rods 52 is to improve the lifting stability of the fixed base 30 and to dampen vibrations when the fixed base 30 and the verification mechanism 40 vibrate, thereby improving the stability of the placement of the verification mechanism 40.

[0027] In the embodiments of this application, such as Figure 1-2 as well as Figure 5-6As shown, the verification mechanism 40 includes a phantom 41 and a frame 43 mounted on the end of the phantom 41. Four fixing blocks 31 are symmetrically arranged on the fixing base 30. The bottom of the fixing block 31 is rotatably mounted on the fixing base 30 via a rotating rod 34. The fixing block 31 has an arc-shaped surface that matches the shape of the frame 43. After the verification mechanism 40 is placed, the rotating rod 34 controls the fixing block 31 to rotate, so that the upper end of the fixing block 31 moves closer to the verification mechanism 40. The upper end of the fixing block 31 presses and fixes the frame 43, so that the frame 43 and the phantom 41 are stably placed on the fixing base 30, preventing the verification mechanism 40 from moving during use, thereby improving the accuracy of three-dimensional dose distribution data measurement. In addition, an elastic block 32 is provided on the side of the fixing block 31 facing the frame 43. The elastic block 32 is used to improve the clamping stability.

[0028] It should be noted that, because the range of the proton beam is highly sensitive to the medium it passes through, when the proton beam irradiates the phantom 41 from the bottom or rear side, it should pass through as few objects as possible other than the phantom 41. After the frame 43 at the end of the phantom 41 is placed, the phantom 41 is suspended in the air, i.e. Figure 3 As shown.

[0029] In this embodiment, a through groove is provided on the fixed base 30 at the position of the fixed block 31. A connecting seat 35 is installed at the lower end of the fixed block 31. The connecting seat 35 is fixedly connected to the rotating rod 34. When the rotating rod 34 rotates, it drives the fixed block 31 to rotate through the connecting seat 35. When the upper end of the fixed block 31 moves close to the verification mechanism 40, the lower end of the fixed block 31 is retracted into the through groove. When the verification mechanism 40 needs to be removed from the fixed base 30, the rotating rod 34 is controlled to rotate in the opposite direction. The lower end of the fixed block 31 lifts the frame 43, so that the verification mechanism 40 can be removed more easily. It is worth noting that in this embodiment, the frame 43 and the fixed block 31 are set at one end of the mold 41. When the mold 41 is removed, a hoisting device can be used to fix the mold 41 to prevent the mold 41 from falling directly from the fixed base 30. As another embodiment, the frame 43 and the fixed block 31 can be set at both ends of the mold 41.

[0030] Furthermore, in this embodiment, two rotating rods 34 are symmetrically arranged at the bottom of the fixed base 30, and the two rotating rods 34 rotate synchronously (the synchronous rotation of the two rotating rods 34 can be controlled by a synchronous belt). A second motor 33 is fixedly installed on the fixed base 30, and the output end of the second motor 33 is fixedly connected to one of the rotating rods 34. In this embodiment, the second motor 33 is a forward and reverse rotating motor.

[0031] In the embodiments of this application, such as Figure 6As shown, the verification mechanism 40 also includes a detector 42 and a data processing module. In this embodiment, the phantom 41 is a cylindrical structure with multiple ionization layers inside. Each ionization layer has multiple detectors 42 evenly distributed. The detectors 42 are high-precision ionization chamber detectors used to measure proton beam dose. The phantom 41 is 45cm long and 35cm in diameter. The sensitive volume of each detector 42 is 0.1cc, the center-to-center distance between adjacent detectors 42 is 0.5cm, and the multiple detectors 42 can work simultaneously.

[0032] Furthermore, the data processing module includes a data processing unit and a user interface, wherein:

[0033] The data processing unit is electrically connected to the detector 42. The data processing unit is used to receive data from the detector 42 and reconstruct a three-dimensional dose distribution map. At the same time, it compares and analyzes the reconstructed three-dimensional dose distribution map with the preset treatment plan dose distribution to obtain the analysis results.

[0034] The user interface, which is communicatively connected to the data processing unit, is used to display a three-dimensional dose distribution map and analysis results. The user interface provides a three-dimensional visualization view so that the operator can identify areas of dose deviation and uneven distribution.

[0035] Furthermore, in this embodiment, the working principle of the three-dimensional dose verification device for proton therapy planning includes the following steps:

[0036] S101. Place the three-dimensional dose verification device on the treatment bed and adjust the position of the verification mechanism 40 through the three-dimensional moving platform so that the isocenter of the verification mechanism 40 coincides with the position of the treatment isocenter.

[0037] S102. Execute the proton therapy plan and obtain dose data collected by the detector in the verification unit 40;

[0038] S103, the data processing unit receives data from detector 42 and reconstructs a three-dimensional dose distribution map. At the same time, it compares and analyzes the reconstructed three-dimensional dose distribution map with the preset treatment plan dose distribution to obtain the analysis results.

[0039] S104. The user interface displays a three-dimensional dose distribution map and analysis results.

[0040] 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.

Claims

1. A three-dimensional dose verification device for proton therapy planning, characterized in that, The system includes a three-dimensional moving platform and a verification mechanism (40). The three-dimensional moving platform includes a first moving mechanism (10), a second moving mechanism (20), a fixed base (30), and a mounting base (50). The first moving mechanism (10) and the second moving mechanism (20) have the same structure. The first moving mechanism (10) includes a first moving base (11) and a drive assembly disposed on the first moving base (11). The first moving base (11) has two guide grooves (12). The drive assembly includes a moving screw rotatably mounted inside the guide groove (12) and a sliding screw mounted inside the guide groove (12). The movable screw sleeve is threadedly connected to the movable screw rod, and the second moving mechanism (20) is installed on the movable screw sleeve; the mounting base (50) is installed on the second moving mechanism (20), and a telescopic component (51) is fixedly installed on the mounting base (50). The output end of the telescopic component (51) is connected to the fixed base (30); the verification mechanism (40) is set on the mounting base (50). The verification mechanism (40) includes a phantom (41), a detector (42) and a data processing module. The phantom (41) has multiple ionization layers inside, and multiple detectors (42) are evenly distributed in each ionization layer.

2. The three-dimensional dose verification device for proton therapy planning according to claim 1, characterized in that, A first motor (13) is fixedly installed on one side of the first movable seat (11). The output end of the first motor (13) is fixedly connected to one of the movable screws. Both movable screws are equipped with pulleys at their ends, and the two pulleys are connected by a synchronous belt (14).

3. The three-dimensional dose verification device for proton therapy planning according to claim 1, characterized in that, The fixed base (30) and the mounting base (50) are connected by multiple spring rods (52).

4. The three-dimensional dose verification device for proton therapy planning according to claim 1, characterized in that, The verification mechanism (40) also includes a frame (43) which is mounted at the end of the mold (41).

5. The three-dimensional dose verification device for proton therapy planning according to claim 4, characterized in that, Four fixing blocks (31) are symmetrically arranged on the fixing base (30). The bottom of the fixing block (31) is rotatably mounted on the fixing base (30) via a rotating rod (34). The fixing block (31) is provided with an arc-shaped surface that matches the shape of the frame (43).

6. The three-dimensional dose verification device for proton therapy planning according to claim 5, characterized in that, A through slot is provided on the fixed base (30) at the position of the fixed block (31). A connecting seat (35) is installed at the lower end of the fixed block (31). The connecting seat (35) is fixedly connected to the rotating rod (34). Two rotating rods (34) are symmetrically arranged at the bottom of the fixed base (30). The two rotating rods (34) rotate synchronously. A second motor (33) is fixedly installed on the fixed base (30). The output end of the second motor (33) is fixedly connected to one of the rotating rods (34).

7. The three-dimensional dose verification device for proton therapy planning according to claim 1, characterized in that, The detector (42) is used to measure the proton beam dose. The data processing module includes a data processing unit and a user interface. The data processing unit is electrically connected to the detector (42) and is used to receive data from the detector (42) and reconstruct a three-dimensional dose distribution map. At the same time, the reconstructed three-dimensional dose distribution map is compared and analyzed with the preset treatment plan dose distribution to obtain the analysis results. The user interface is communicatively connected to the data processing unit and is used to display the three-dimensional dose distribution map and the analysis results.

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