Double-layer multi-leaf collimator detection experiment device

Abstract

The invention discloses a double-layer multi-leaf collimator detection experiment device, and belongs to the technical field of medical instruments, the double-layer multi-leaf collimator detection experiment device comprises a rack, the upper portion of the rack is rotatably connected with a turning plate, and the rack is fixedly provided with a power device used for driving the turning plate to rotate; trundles are fixedly assembled at the bottom of the rack; a rotation assembly is installed on the turning plate, the double-layer multi-leaf collimator is assembled on the rotation assembly, and the double-layer multi-leaf collimator can be driven by the rotation assembly to rotate in the plane where the turning plate is located. Revolution, rotation and three-axis linkage spherical motion of a treatment head of a full-circle spherical accelerator can be comprehensively simulated, so that all-directional performance detection of a double-layer multi-leaf collimator before installation is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to a double-layer multi-leaf collimator detection experiment device, belonging to the technical field of medical instruments. BACKGROUND

[0002] The full-sphere medical electron linear accelerator is the core equipment of tumor radiotherapy, and the double-layer multi-leaf collimator as a key component thereof is mainly used for precisely regulating the shape and range of the ray beam: through the coordinated opening and closing of the two layers of multi-leaf gratings, the radiation field profile can be adjusted in real time according to the three-dimensional morphology of the tumor target area, so that the high-dose area of the rays precisely covers the lesion, while the irradiation to the surrounding normal tissues and sensitive organs is minimized, which is the core guarantee for realizing the precise treatment technology such as "conformal radiotherapy". The functional integrity, movement accuracy and dose regulation accuracy directly determine the commissioning quality, treatment effect and patient safety of the radiotherapy equipment, and are of great significance for shortening the equipment installation period and reducing the clinical risk.

[0003] Although the existing detection device for the double-layer multi-leaf collimator is equipped with a ray beam simulation mechanism and an imaging mechanism, the center beam axis of the simulation light source is perpendicular to the installation plane of the multi-leaf collimator and passes through the center reference point, and at the same time, the shape and size of the simulation imaging are ensured to be the same as the radiation field in actual application, but there are significant limitations in the motion trajectory simulation: only the simple reproduction of the rotation trajectory of the gantry part can be realized, the full circumferential revolution motion of the treatment head around the patient's target area cannot be simulated, and the three-axis linkage spherical motion of the multi-angle self-rotation and revolution, self-rotation, and plane movement of the treatment head itself cannot be reproduced. This leads to the fact that before the double-layer multi-leaf collimator is installed into the treatment head, it is difficult to complete the full-range performance detection in the complex motion scene close to the real clinical working condition, and potential problems such as motion interference, positioning deviation, and abnormal dose distribution of the collimator are likely to be exposed after installation, thereby causing multiple rework and commissioning, and seriously affecting the equipment installation efficiency and treatment preparation period. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a double-layer multi-leaf collimator detection experiment device which can fully simulate the full-sphere accelerator treatment head revolution, self-rotation and three-axis linkage spherical motion to realize full-range performance detection of the double-layer multi-leaf collimator before installation.

[0005] The technical scheme adopted by the present application to solve the existing problems is:

[0006] A testing apparatus for a double-layer multi-leaf collimator includes a frame, a flap rotatably connected to the upper part of the frame, and a power device for driving the flap to rotate fixedly installed on the frame; casters are fixedly mounted at the bottom of the frame; a self-rotating component is installed on the flap, and the double-layer multi-leaf collimator is mounted on the self-rotating component, which can drive the double-layer multi-leaf collimator to rotate within the plane of the flap.

[0007] Preferably, a flip plate mounting base is mirror-mounted on the top of the frame, the flip plate mounting base is provided with a flip plate mounting hole, and the flip plate includes a mirror-mounted rotating shaft and a central self-rotating component mounting base, the rotating shaft being rotatably connected to the flip plate mounting hole.

[0008] Preferably, the self-rotating component includes a turntable, a bearing, and a bearing housing. The bearing is mounted on the bearing housing, the turntable is mounted on the inner ring of the bearing, the turntable is rotatably connected to the bearing housing via the bearing, and the bearing housing is fixedly connected to the self-rotating component mounting base.

[0009] Preferably, a power unit is fixedly installed on one of the flip-plate mounting seats of the frame. The input end of the power unit is connected to a handwheel, and the handwheel is provided with a handle for easy gripping and operation. The output end of the power unit is connected to a rotating shaft.

[0010] Preferably, the double-layer multi-leaf collimator is fixedly installed on the top of the turntable, and multiple sets of positioning components are provided between the turntable and the flip plate. The positioning components can accurately limit the rotation angle of the turntable, so that the double-layer multi-leaf collimator can be stably stopped at a fixed angle position in the top plane of the turntable.

[0011] Preferably, the caster is equipped with a foot brake, which can be used to lock and unlock the caster by stepping on it, ensuring that the device is stable and fixed or can move flexibly during the testing process.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. Precise reproduction of motion trajectory: This device achieves planar movement without blind spots through the casters at the bottom of the frame. Combined with the 360° circumferential rotation of the flip plate to simulate the revolution trajectory, and the turntable rotation adjustment and positioning components to lock and reproduce the rotation motion, the three work together to cover any point on the spherical surface of the full-circumference spherical accelerator treatment head with three-axis linkage, completely simulating various position states when the collimator is working, and solving the problem of incomplete motion trajectory simulation of existing devices;

[0014] 2. Anticipate potential problems: With the help of real-time communication feedback between the dedicated driver module and the computer monitor, a comprehensive simulation test can be performed before the collimator is installed on the treatment head. This can accurately identify and resolve performance defects, reduce rework caused by collimator problems after installation, and significantly improve installation efficiency.

[0015] 3. Optimized structure ensures stability: Thin-walled sealed cross roller bearings are used to withstand multi-directional forces and ensure rotation accuracy. The worm gear reducer has a self-locking function to ensure reliable orbital positioning. The counterweight balances the torque and reduces the eccentric torque, making the device run smoothly, easy to operate, and extending its service life. It also supports switching between manual and automatic operation to adapt to different testing scenarios.

[0016] 4. Shorten the commissioning cycle: By completing the comprehensive performance verification of the collimator in advance, the incidence of problems after installation is effectively reduced, saving valuable time for the smooth installation of the full-circumference spherical medical electronic linear accelerator and improving the economy and reliability of equipment commissioning. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a double-layer multi-leaf collimator testing experimental device according to the present invention;

[0018] Figure 2 This is a full sectional view of the rotating component of a double-layer multi-leaf collimator detection experimental device according to the present invention;

[0019] Figure 3 This is a front view of the flip plate of a double-layer multi-leaf collimator testing experimental device according to the present invention;

[0020] Figure 4 This is a partial cross-sectional view of the frame of the experimental device for testing a double-layer multi-leaf collimator according to the present invention.

[0021] In the picture:

[0022] 1. Double-layer multi-leaf collimator; 2. Rotation assembly; 201. Turntable; 202. Pressure cap; 203. Bearing; 204. Bearing retaining ring; 205. Bearing housing; 3. Flip plate; 301. Rotating shaft; 302. Rotation assembly mounting base; 4. Counterweight; 5. Frame; 6. Flip plate mounting base; 601. Flip plate mounting hole; 7. Casters; 8. Power unit; 801. Handwheel; 802. Handle. Detailed Implementation

[0023] This specification and claims do not distinguish components by differences in name, but rather by differences in function. In the description of this invention, it should be understood that terms such as "upper," "lower," "front," "rear," "left," "right," and "horizontal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These are used solely for the convenience of describing the invention and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In this invention, unless otherwise explicitly specified and limited, terms such as "installed," "connected," "linked," and "fixed" should be interpreted broadly. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0024] like Figures 1-4 The experimental apparatus for testing a double-layer multi-leaf collimator includes a frame 5. A flap 3 is rotatably connected to the upper part of the frame 5, and a power device 8 for driving the flap 3 to rotate is fixedly installed on the frame 5. Casters 7 are fixedly mounted at the bottom of the frame 5. The casters 7 are equipped with foot brakes, which can be used to lock and unlock the casters by stepping on them, ensuring that the apparatus is stable and fixed or can move flexibly during testing. A self-rotating component 2 is installed on the flap 3, and the double-layer multi-leaf collimator 1 is mounted on the self-rotating component 2. The self-rotating component 2 can drive the double-layer multi-leaf collimator 1 to rotate within the plane of the flap 3.

[0025] The top of the frame 5 is mirror-mounted with a flip plate mounting seat 6, which has a flip plate mounting hole 601. The flip plate 3 includes a mirror-mounted rotating shaft 301 and a central self-rotating component mounting seat 302. The rotating shaft 301 is rotatably connected to the flip plate mounting hole 601.

[0026] The self-rotating component 2 includes a turntable 201, a bearing 203, and a bearing housing 205. The bearing 203 is installed on a stepped hole in the bearing housing 205, and the bottom of the bearing 203 abuts against the end face of the stepped hole in the bearing housing 205. A bearing retainer 204 is fixedly installed on the upper part of the bearing housing 205, and the bearing retainer 204 abuts against the top of the bearing 203, thus restricting the axial displacement of the bearing 203. A stepped shaft is provided at the lower part of the turntable 201, and the turntable 201 is installed on the inner ring of the bearing 203. The end face of the stepped shaft of the turntable 201 abuts against the top of the inner ring of the bearing 203. A pressure cap 202 is fixedly installed on the bottom surface of the turntable 201, and the pressure cap 202 abuts against the bottom of the inner ring of the bearing 203, thus restricting the axial movement of the turntable 201. The turntable 201 is rotatably connected to the bearing housing 205 through the bearing 203, and the bearing housing 205 is fixedly connected to the self-rotating component mounting base 302.

[0027] Bearing 203 is a thin-walled sealed crossed roller bearing. A thin-walled sealed crossed roller bearing is a high-precision bearing that arranges cylindrical or tapered rollers in a cross pattern in the raceway, adopts a thin-walled structure design and is equipped with a sealing device. It can withstand radial force, axial force and overturning moment at the same time, and is suitable for precision rotating mechanisms with strict requirements on space and weight.

[0028] A power unit 8 is fixedly mounted on one of the flip-plate mounting seats 6 of the frame 5. The input end of the power unit 8 is connected to a handwheel 801, and the handwheel 801 is provided with a handle 802 for easy gripping and operation. The output end of the power unit 8 is connected to a rotating shaft 301. The power unit 8 is a worm gear reducer, which is a mature existing technology and has a self-locking function.

[0029] The double-layer multi-leaf collimator 1 is fixedly installed on the top of the turntable 201. Multiple positioning components are provided between the turntable 201 and the flip plate 3. These positioning components precisely limit the rotation angle of the turntable 201, ensuring the double-layer multi-leaf collimator 1 remains stably positioned at a fixed angle within the top plane of the turntable 201. The multiple positioning components consist of three sets of double-headed studs fixedly distributed at 0°, 45°, and 90° positions on the flip plate 3. Positioning holes adapted to these three sets of double-headed studs are provided on the turntable 201. The turntable 201 rotates the double-layer multi-leaf collimator 1 within the plane of the flip plate 3. When positioning at a specific angle is required, the turntable 201 is rotated, aligning the positioning holes with the corresponding double-headed studs. The double-headed studs are then rotated to extend into the positioning holes, thus fixing the double-layer multi-leaf collimator 1 in a fixed position.

[0030] During operation, release the foot brake on caster 7, push the double-layer multi-leaf collimator testing experimental device to the appropriate position, press the foot brake to fix the position of the double-layer multi-leaf collimator testing experimental device, hold handle 802, and rotate handwheel 801. Handwheel 801 drives power device 8 to rotate, and power device 8 drives flap 3 to rotate 360° around shaft 301, thereby driving double-layer multi-leaf collimator 1 to rotate around shaft 301. When flap 3 rotates to the appropriate position, stop rotating handwheel 801. The self-locking function of device 8 keeps the flap 3 in a predetermined position. Manually rotating the turntable 201 causes the double-layer multi-leaf collimator 1 to rotate within the plane of the flap 3. When the turntable 201 rotates the double-layer multi-leaf collimator 1 to the appropriate position, rotation of the turntable 201 stops. To prevent rotation of the turntable 201, it can be manually fixed, or the double-ended studs of the flap 3 can be rotated to insert into the positioning holes of the turntable 201, thus fixing the double-layer multi-leaf collimator 1 in a fixed position. The double-layer multi-leaf collimator 1 is equipped with a dedicated drive module. The drive module establishes a communication connection with a computer monitor through a data interface, allowing real-time feedback of the dynamic performance parameters of the multi-leaf collimator at various preset angles via the computer monitor.

[0031] A counterweight 4 is installed at the bottom of the flip plate 3. The counterweight 4 and the double-layer multi-leaf collimator 1 maintain torque balance, reduce the eccentric torque when the simulator frame rotates, make the rotation smoother and less strenuous, and extend the service life of the device.

[0032] Of course, the rotation of the flap 3 and the rotation of the self-rotating component 2 can also be controlled by the control system to drive the motor to rotate, thereby realizing the automated operation of the entire device.

[0033] The double-layer multi-leaf collimator testing experimental device accurately simulates the full-circumferential revolution trajectory of a medical linear accelerator around the treatment target area by rotating the flip plate 3 360° along the rotating shaft 301. Relying on the rotation adjustment and positioning components of the turntable 201 in the plane of the flip plate 3, the multi-dimensional rotation angle adjustment of the collimator relative to the central axis of the X-ray beam is synchronously reproduced, completely restoring the motion characteristics of the equipment irradiation at multiple angles in clinical treatment. The planar movement without dead angles achieved by the casters 7 at the bottom of the frame 5, the revolution rotation driven by the flip plate 3, and the rotation adjustment achieved by the turntable 201 work together to move the double-layer multi-leaf collimator 1 to any point on the spherical surface of the full-circumferential spherical accelerator with three-axis linkage, further accurately simulating the spatial motion trajectory of the treatment head of the full-circumferential spherical accelerator.

[0034] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A testing apparatus for a double-layer multi-leaf collimator, characterized in that: The system includes a frame (5), on which a flap (3) is rotatably connected, and a power device (8) for driving the flap (3) to rotate is fixedly installed on the frame (5); casters (7) are fixedly mounted on the bottom of the frame (5); a self-rotating component (2) is installed on the flap (3), and a double-layer multi-leaf collimator (1) is mounted on the self-rotating component (2). The self-rotating component (2) can drive the double-layer multi-leaf collimator (1) to rotate in the plane where the flap (3) is located.

2. The experimental apparatus for detecting a double-layer multi-leaf collimator according to claim 1, characterized in that: The top of the frame (5) is mirror-mounted with a flip plate mounting seat (6), the flip plate mounting seat (6) is provided with a flip plate mounting hole (601), the flip plate (3) includes a mirror-mounted rotating shaft (301) and a central self-rotating component mounting seat (302), the rotating shaft (301) is rotatably connected to the flip plate mounting hole (601).

3. The experimental apparatus for detecting a double-layer multi-leaf collimator according to claim 2, characterized in that: The self-rotating component (2) includes a turntable (201), a bearing (203), and a bearing housing (205). The bearing (203) is mounted on the bearing housing (205), and the turntable (201) is mounted on the inner ring of the bearing (203). The turntable (201) is rotatably connected to the bearing housing (205) through the bearing (203). The bearing housing (205) is fixedly connected to the self-rotating component mounting base (302).

4. The experimental apparatus for detecting a double-layer multi-leaf collimator according to claim 3, characterized in that: A power unit (8) is fixedly installed on one of the flip plate mounting seats (6) of the frame (5). The input end of the power unit (8) is connected to a handwheel (801). The handwheel (801) is provided with a handle (802) for easy gripping and operation. The output end of the power unit (8) is connected to a rotating shaft (301).

5. The experimental apparatus for detecting a double-layer multi-leaf collimator according to claim 3, characterized in that: The double-layer multi-leaf collimator (1) is fixedly installed on the top of the turntable (201). Multiple sets of positioning components are provided between the turntable (201) and the flip plate (3). The positioning components can precisely limit the rotation angle of the turntable (201) so that the double-layer multi-leaf collimator (1) can be stably stopped at a fixed angle position in the top plane of the turntable (201).

6. The experimental apparatus for detecting a double-layer multi-leaf collimator according to claim 1, characterized in that: The caster (7) is equipped with a foot brake, which can lock and unlock the caster by stepping on it, ensuring that the device is stable and fixed or moves flexibly during the testing process.

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