Linear accelerator device with offset compensation function

Abstract

The invention relates to the technical field of linear accelerators, in particular to a linear accelerator device with an offset compensation function. The linear accelerator device comprises a treatment mechanism and a treatment bed. The treatment bed comprises a base plate and a bottom plate which moves up and down above the base plate through a lifting assembly; the upper portion of the bottom plate is in sliding connection with a bed board through a displacement assembly, and the compensation mechanism is used for conducting offset compensation on the end portion of the bed board when the bed board moves into the treatment mechanism. Due to the fact that the bed board bears the body weight and the gravity of a patient, the overhanging end of the bed board is prone to generating downward bending deformation, the deformation can damage the horizontal reference of the bed board, the compensation mechanism can adjust and offset the bending amount, fine adjustment is carried out by applying reverse acting force, and the bed board is kept in a preset horizontal state. By means of the design, positioning errors caused by deformation of the bed board are fundamentally eliminated.

Description

Technical Field

[0001] This invention relates to the field of linear accelerator technology, and more particularly to a linear accelerator device with offset compensation function. Background Technology

[0002] Medical linear accelerators are the core equipment for modern tumor radiotherapy. Their basic principle is to use high-energy rays to precisely irradiate tumor lesions from outside the body to destroy the DNA of cancer cells, thereby inhibiting or killing the tumor.

[0003] Currently, mainstream linear accelerator devices typically include a treatment mechanism that rotates isocentrically around the patient and a treatment bed to hold the patient. The treatment mechanism generally consists of a fixed gantry and a rotating gantry. The treatment head is mounted on the rotating gantry, and by rotating the gantry at multiple angles, the tumor can be irradiated from different directions to achieve an ideal dose distribution. The treatment bed is responsible for precisely moving and fixing the patient in a preset treatment position.

[0004] However, in practical applications, the treatment bed's board usually has a certain overhang length for ease of operation. When the patient lies on the board and moves under the treatment head, the overhanging end of the board inevitably undergoes a slight downward bending deformation under the combined effect of the patient's weight and the board's own weight. Although this deformation is small, in the field of radiotherapy where millimeter-level precision is required, it is enough to cause a deviation between the patient's actual position and the planned position, resulting in inaccurate beam focusing, affecting the treatment effect, and possibly even causing unnecessary damage to normal tissues.

[0005] Therefore, in order to solve the above problems, we propose a linear accelerator device with offset compensation function. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies, such as the unavoidable slight downward bending deformation at the overhanging end of the bed board, and to propose a linear accelerator device with offset compensation function.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: Design a linear accelerator device with offset compensation function: This includes treatment facilities and treatment beds; The treatment bed includes a base plate and a bottom plate that moves up and down above the base plate via a lifting assembly; A bed board is slidably connected above the base plate via a displacement assembly. A compensation mechanism is also installed above the base plate. The compensation mechanism is used to compensate for the offset of the end of the bed board when the bed board moves into the treatment mechanism.

[0008] Furthermore, the displacement component includes: The mounting base is fixedly installed on the base plate; and Two guide rods are slidably inserted into the fixed base; A slide is connected between the ends of the two guide rods, and the bottom of the bed board is fixedly connected to the slide.

[0009] Furthermore, a guide rail slider assembly is also provided between the bottom of the bed board and the base plate; A drive component for driving the slide to move linearly is fixedly installed above the base plate.

[0010] Furthermore, the compensation mechanism includes: Adjustment assembly for adjusting the height of the rear end of the bed board; And reinforcing components for supporting the bed board during adjustment; The adjustment assembly is connected between the guide rod and the base plate.

[0011] Furthermore, the adjustment component includes: A force-bearing base plate is fixedly installed on the base plate. A force-bearing arm is formed on the upper part of the force-bearing base plate. A guide sleeve is fixedly installed on the upper end of the force-bearing arm. The guide rod passes through the guide sleeve. The guide rod is threaded with a nut sleeve on its outer side, and a connecting seat is fixedly installed at the bottom of the bed board. A drive arm is pinned between the nut sleeve and the connecting seat. The force-bearing arm and the driving arm are inclined in the same direction.

[0012] Furthermore, it also includes two drive seats fixedly installed above the base plate. The drive seats are rotatably connected to a worm gear and a gear sleeve. A ring tooth portion is formed on the outside of the guide rod, and the ring tooth portion engages with the inside of the gear sleeve. The outer side of the gear sleeve is formed with a worm gear portion, which meshes with the worm. A dual-axis motor is also fixedly installed above the base plate, and the two shaft ends of the dual-axis motor are respectively fixed to the two worms.

[0013] Furthermore, the reinforcing component includes: The sleeve pinned to the force arm; and Rotary ring connected to the outside of the guide rod; A connecting rod is pinned to the lower part of the swivel, and the end of the connecting rod is inserted into the sleeve.

[0014] Furthermore, a bracket is fixedly installed at the end of the sleeve, and an electromagnetic push rod is fixedly installed on the outside of the bracket, with the shaft end of the electromagnetic push rod penetrating through the sleeve. The outer side of the connecting rod is provided with a slot that engages with the shaft end of the electromagnetic push rod.

[0015] Furthermore, the treatment mechanism includes a fixed frame and a rotating frame rotatably connected to the front end of the fixed frame, with a treatment head mounted below the end of the rotating frame.

[0016] Furthermore, the lifting assembly is a scissor lift assembly connected between the base plate and the bottom plate.

[0017] The linear accelerator device with offset compensation function proposed in this invention has the following advantages: By setting a compensation mechanism above the base plate, when the patient moves with the bed board to below the treatment head, the bed board is prone to downward bending deformation at its cantilever end due to the patient's weight and its own gravity. This deformation will destroy the horizontal reference of the bed board, thereby affecting the accuracy of tumor localization. The compensation mechanism can adjust and counteract this bending amount by applying a reverse force for fine adjustment, so that the bed board is kept in a preset horizontal state. This design fundamentally eliminates the positioning error caused by bed board deformation, providing a reliable guarantee for precise radiotherapy. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is a schematic diagram of the treatment bed structure of the present invention; Figure 4 This is a schematic diagram of the structure when the bed board and the bottom plate of the present invention are separated; Figure 5 This is a schematic diagram of the displacement component structure of the present invention; Figure 6 This is a top view of the base plate of the present invention; Figure 7 This is a schematic diagram of the base plate structure of the present invention; Figure 8 for Figure 7 A magnified structural diagram of area A; Figure 9 This is a schematic diagram of the adjustment component structure of the present invention; Figure 10 This is a schematic diagram of the reinforcing component structure of the present invention; Figure 11 This is a schematic diagram of the bed board compensation adjustment action of the present invention.

[0019] In the diagram: 1. Treatment mechanism; 11. Fixed frame; 12. Rotating frame; 13. Treatment head; 2. Treatment bed; 21. Base plate; 22. Lifting assembly; 23. Base plate; 24. Displacement assembly; 241. Fixed seat; 242. Guide rod; 243. Slide; 244. Guide rail slider assembly; 245. Drive component; 246. Ring gear; 25. Bed board; 26. Dual-axis motor; 3. Compensation mechanism; 1. Adjustment assembly; 310. Worm gear; 311. Force-bearing base plate; 312. Force-bearing arm; 313. Guide sleeve; 314. Nut sleeve; 315. Connecting seat; 316. Drive arm; 317. Drive seat; 318. Worm; 319. Gear sleeve; 32. Reinforcing assembly; 321. Sleeve; 322. Rotary ring; 323. Connecting rod; 324. Bracket; 325. Electromagnetic push rod; 326. Slot. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Reference Figure 1-11 As one embodiment of the invention, a linear accelerator device with offset compensation function is disclosed. Specifically, the linear accelerator device includes a treatment mechanism 1 and a treatment bed 2. The treatment mechanism 1 includes a fixed frame 11 and a rotating frame 12 rotatably connected to the front end of the fixed frame 11. A treatment head 13 is installed below the end of the rotating frame 12. The rotating frame 12 can rotate around the patient at a large angle. High-energy rays such as X-rays or electron beams are generated through the treatment head 13, so that the rays can irradiate the tumor from different angles and directions, thereby effectively killing tumor cells while maximizing the dispersion of the dose to the surrounding normal tissues. Its specific structure is a standard technical method used by professionals in the field, and will not be elaborated upon here. Reference Figure 3 Furthermore, in this invention, the treatment bed 2 includes a base plate 21 and a bottom plate 23 that moves up and down above the base plate 21 via a lifting assembly 22. Optionally, in this embodiment, the lifting assembly 22 is a scissor lift assembly connected between the base plate 21 and the base plate 23. The scissor lift assembly can be electrically controlled by an electric actuator to adjust the height of the base plate 23. Of course, in order to effectively protect the scissor lift assembly and avoid injury to the human body from the scissor action, in this embodiment, an accordion cover is also installed between the base plate 21 and the base plate 23. The accordion cover is fitted on the outside of the scissor lift assembly. The specific setting of the scissor structure is a conventional technical means for those skilled in the art and will not be described in detail here.

[0022] Reference Figure 4 Furthermore, a bed board 25 is slidably connected above the base plate 23 via a displacement assembly 24. A compensation mechanism 3 is also installed above the base plate 23. The compensation mechanism 3 is used to compensate for the offset of the end of the bed board 25 when the bed board 25 moves into the treatment mechanism 1.

[0023] In other words, by setting a compensation mechanism 3 above the base plate 23, when the patient moves with the bed board 25 to below the treatment head 13, the bed board 25 is prone to downward bending deformation at its cantilever end due to bearing the patient's weight and its own gravity. This deformation will destroy the horizontal reference of the bed board, thereby affecting the accuracy of tumor localization. The compensation mechanism 3 can adjust and counteract this bending amount by applying a reverse force to make fine adjustments, so that the bed board 25 is kept in a preset horizontal state. This design fundamentally eliminates the positioning error caused by the deformation of the bed board 25, providing a reliable guarantee for precise radiotherapy.

[0024] Reference Figure 5 In some embodiments, the displacement component 24 of the present invention includes: The fixing seat 241 is fixedly installed on the base plate 23; and Two guide rods 242 are slidably inserted into the fixed base 241; A slide 243 is connected between the ends of the two guide rods 242, and the bottom of the bed board 25 is fixedly connected to the slide 243.

[0025] It should be noted that the guide rod 242 and the slide block 243 described in this embodiment of the invention are rotatably connected, so as to facilitate the subsequent thread drive control of the nut sleeve 314. In addition, the two guide rods 242 are arranged horizontally at intervals. In this embodiment, a bushing can also be installed on the end face of the fixed seat 241 to guide the guide rods 242 through, so as to further optimize the movement stability of the guide rods 242.

[0026] Reference Figure 5 Furthermore, in this embodiment, a guide rail slider assembly 244 is also provided between the bed board 25 and the base plate 23; In this embodiment, the guide rail slider assembly 244 includes two guide rails fixed on the base plate 23 and multiple sliders fixed below the bed board 25. The sliders and guide rails slide together to form a first force-bearing support base for the bed board 25. Specifically, in this invention, three sliders are provided on each side of the guide rail. Among them, the two sliders facing away from the treatment mechanism 1 are close to each other. The purpose of this design is that when the bed board 25 slides outward, the two sliders at the rear can provide stable support for the tail of the bed board 25, thereby improving the load-bearing capacity of the bed board 25.

[0027] A drive unit 245 for driving the slide 243 to move linearly is fixedly installed above the base plate 23. Preferably, in this embodiment, the drive unit 245 can be set as an electric push rod. The shaft end of the electric push rod passes through the fixed seat 241 and is connected to the slide 243. In actual use, when the user lies on the bed board 25, the height of the patient can be adjusted by the lifting component 22. Then, the drive unit 245 is turned on, and the drive unit 245 pulls the slide 243 to move, so as to move the bed board 25 toward one side of the treatment mechanism 1 until it moves to below the treatment head 13, at which point the treatment operation can be performed.

[0028] Reference Figure 5 Based on the above embodiments, the compensation mechanism 3 in this embodiment includes: an adjustment component 31 for adjusting the height of the tail end of the bed board 25; And a reinforcing component 32 for supporting the bed board 25 during adjustment. In this embodiment, the reinforcing component 32 is used to provide a supporting force strength for the guide rod 242, so that when the adjusting component 31 adjusts the tail end of the bed board 25, the force strength of the guide rod 242 can be ensured. The adjustment component 31 is connected between the guide rod 242 and the base plate 23.

[0029] Reference Figure 7 , Figure 8 , Figure 9 Specifically, in this embodiment of the invention, the adjustment component 31 includes: A force-bearing base plate 311 is fixedly installed on the base plate 23. A force-bearing arm 312 is formed on the upper part of the force-bearing base plate 311. A guide sleeve 313 is fixedly installed on the upper end of the force-bearing arm 312. The guide rod 242 passes through the guide sleeve 313. The guide rod 242 is threaded with a nut sleeve 314 on its outer side, and a connecting seat 315 is fixedly installed at the bottom of the bed board 25. A drive arm 316 is pinned between the nut sleeve 314 and the connecting seat 315. The force-bearing arm 312 and the driving arm 316 are inclined in the same direction.

[0030] It should be noted that, in this embodiment of the invention, a limiting block is also fixedly installed at the end of the guide rod 242. The limiting block is not connected to the bed board 25, and its purpose is to limit the movement range of the nut sleeve 314.

[0031] In other words, when the bed board 25 moves into the treatment mechanism 1, if its cantilever end bends downward, it can be rotated by rotating the guide rod 242. Since the nut sleeve 314 and the guide rod 242 are connected by a threaded connection, when the guide rod 242 rotates circumferentially, it will drive the nut sleeve 314 to move linearly. When the nut sleeve 314 moves linearly, such as... Figure 11 As shown, when the nut sleeve 314 moves linearly, it will rotate through the drive arm 316. The connecting seat 315 acts as a counterforce to the drive arm 316 as it rotates, which drives the bed plate 25 to bend and reset.

[0032] It should be noted that, as Figure 11 As shown, under normal conditions, the second force-bearing support base is formed by the nut sleeve 314, the connecting seat 315, and the drive arm 316. When the end of the bed board 25 bends, the drive arm 316 will rotate and deviate due to the bending of the end of the bed board 25. Therefore, in this embodiment, by adopting the design of the movable nut sleeve 314, when it moves, it will correct the tilt angle of the drive arm 316 and drive the drive arm 316 to push the bed board 25 upward and reverse to reset the bending, so that the end of the bed board 25 remains in a horizontal force-bearing support state, thereby completely compensating for the deviation of the bed board 25.

[0033] exist Figure 11 In the diagram, the dashed path represents the direction of force transmission of the force nut sleeve 314. That is, when the nut sleeve 314 pushes the drive arm 316, it will generate a reverse pushing force. This reverse pushing force is transmitted to the force-bearing base plate 311 through the connecting rod 323 and the sleeve 321. This can provide a stable support for the end of the guide rod 242 and avoid the problem of deformation under stress.

[0034] Reference Figure 8 Of course, in order to achieve rotation control of the two guide rods 242, this embodiment also includes two drive seats 317 fixedly installed on the top of the base plate 23. The drive seats 317 are rotatably connected to a worm gear 318 and a gear sleeve 319. A ring tooth portion 246 is formed on the outside of the guide rods 242, and the ring tooth portion 246 meshes with the inside of the gear sleeve 319. The outer side of the gear sleeve 319 is formed with a worm gear portion 310, which meshes with the worm 318 for transmission. A dual-axis motor 26 is also fixedly installed above the base plate 23, and the two shaft ends of the dual-axis motor 26 are respectively fixed to the two worms 318.

[0035] In other words, when it is necessary to compensate for the bending offset of the end of the bed board 25, the aforementioned dual-axis motor 26 can be turned on. When the dual-axis motor 26 is working, it will synchronously drive the two worms 318 on both sides to rotate. Since the worm 318 is driven by meshing with the worm wheel 310, when the worm wheel 310 rotates, the entire guide rod 242 is driven to rotate circumferentially by the engaging force of the gear sleeve 319 and the ring tooth 246 on the outer side of the guide rod 242. As can be seen from the above description, when the guide rod 242 rotates, it will drive the nut sleeve 314 to move linearly to correct the tilt angle of the drive arm 316. With the help of the resistance of the drive arm 316, the bending of the end of the bed board 25 is compensated and corrected.

[0036] Reference Figure 10 In some embodiments, the reinforcing component 32 of the present invention includes: The sleeve 321 is pinned to the force arm 312; and Rotary ring 322 is rotatably connected to the outside of the guide rod 242. Of course, in this embodiment, the rotating ring 322 is locked to the guide rod 242 in the length direction, that is, it can move linearly according to the guide rod 242. Thus, when the guide rod 242 is extended, the rotating ring 322 will also move synchronously, thereby realizing the extension traction of the connecting rod 323. A connecting rod 323 is pinned to the lower part of the rotating ring 322, and the end of the connecting rod 323 is inserted into the sleeve 321.

[0037] In other words, the present invention uses a method of interlocking the connecting rod 323 and the sleeve 321 to meet the position change requirements of the guide rod 242 during movement. For example, when the bed board 25 moves toward the side of the treatment mechanism 1, the connecting rod 323 will move outward and extend inside the sleeve 321. This can meet the real-time change of the extension length of the connecting rod 323 during the movement of the bed board 25.

[0038] Of course, in order to achieve length locking between sleeve 321 and connecting rod 323, and to provide a stable support force to the end of guide rod 242 when nut sleeve 314 is moved, so as to avoid deformation of guide rod 242 caused by reverse resistance force from nut sleeve 314, in this invention, a bracket 324 is fixedly installed at the end of sleeve 321, and an electromagnetic push rod 325 is fixedly installed on the outside of the bracket 324, and the shaft end of the electromagnetic push rod 325 passes through sleeve 321; The outer side of the connecting rod 323 is provided with slots 326 that engage with the shaft end of the electromagnetic push rod 325. Specifically, multiple slots 326 may be provided at intervals in this invention. When the dual-axis motor 26 is activated, the electromagnetic push rod 325 is activated synchronously. The end of the electromagnetic push rod 325 and the slots 326 engage quickly to lock the length between the sleeve 321 and the connecting rod 323. At this time, the sleeve 321 and the connecting rod 323 form a triangular support structure for the end of the guide rod 242. This provides stable support for the end of the guide rod 242, so as to avoid deformation of the guide rod 242 due to the counter-thrust when the nut sleeve 314 moves and pushes.

[0039] That is, the accelerator device invented is used in practice; First, the patient lies on the bed board 25, and the height of the bed board 25 is adjusted by the lifting component 22 until the bed board 25 is raised to the predetermined height; After that, the drive unit 245 is activated, and the drive unit 245 pulls the slide 243 to move linearly. When the slide 243 moves, the bed board 25 can be moved outward in sync to send the patient into the treatment facility 1. At this time, if the suspended end of the bed board 25 bends after it extends, the end of the bed board 25 will bend downwards. When the end of the bed board 25 bends, it will drive the drive arm 316 to swing and deflect. Simultaneously, the dual-axis motor 26 and the electromagnetic push rod 325 are started. The shaft end of the electromagnetic push rod 325 extends to lock the connecting rod 323 inside the sleeve 321. At this time, the fixed-length support arm composed of the entire sleeve 321 and the connecting rod 323 supports the bottom of the guide rod 242. When the dual-axis motor 26 rotates, it drives the gear sleeve 319 to rotate through the meshing force of the worm gear 318 and the worm wheel 310. When the gear sleeve 319 rotates, it drives the guide rod 242 to rotate circumferentially through the ring tooth 246. Since the nut sleeve 314 and the guide rod 242 are threadedly connected, the position of the nut sleeve 314 can be adjusted by means of the threaded connection force, thereby correcting the tilt angle of the drive arm 316. When the drive arm 316 swings, it will push the end of the bed plate 25 to bend and reset in the opposite direction through the connecting seat 315. At the same time, with the stable support of the guide rod 242 by the sleeve 321 and the connecting rod 323, the counter-thrust force of the nut sleeve 314 is transmitted downward to the base plate 23 by the sleeve 321 and the connecting rod 323. In this way, the offset compensation and correction operation of the bed plate 25 can be completed.

[0040] Of course, in this embodiment of the invention, a height sensor, such as a laser sensor, can also be fixedly installed below the end of the bed board 25. It is used to detect the height of the bed board 25 and the ground. When the bed board 25 is lifted upward, if the value of the sensor is less than a predetermined value, the end of the bed board 25 can be adjusted and compensated by the compensation mechanism 3 described in this invention.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A linear accelerator device with offset compensation function, characterized in that: Includes treatment facilities (1) and treatment beds (2); The treatment bed (2) includes a base plate (21) and a bottom plate (23) that moves up and down above the base plate (21) via a lifting assembly (22). A bed board (25) is slidably connected above the base plate (23) via a displacement assembly (24). A compensation mechanism (3) is also installed above the base plate (23). The compensation mechanism (3) is used to offset the end of the bed board (25) when the bed board (25) moves into the treatment mechanism (1).

2. A linear accelerator device with offset compensation function according to claim 1, characterized in that: The displacement component (24) includes: The fixing seat (241) is fixedly installed on the base plate (23); and Two guide rods (242) are slidably inserted in the fixed base (241); A slide (243) is connected between the ends of the two guide rods (242), and the bottom of the bed board (25) is fixedly connected to the slide (243).

3. A linear accelerator device with offset compensation function according to claim 2, characterized in that: A guide rail slider assembly (244) is also provided between the bed board (25) and the base plate (23). A drive unit (245) for driving the slide (243) to move linearly is fixedly installed above the base plate (23).

4. A linear accelerator device with offset compensation function according to claim 2, characterized in that: The compensation mechanism (3) includes: Adjustment assembly (31) for adjusting the height of the tail end of the bed board (25); And a reinforcing assembly (32) for supporting the bed board (25) during adjustment; The adjustment assembly (31) is connected between the guide rod (242) and the base plate (23).

5. A linear accelerator device with offset compensation function according to claim 4, characterized in that: The adjustment component (31) includes: A force-bearing base plate (311) is fixedly installed on the base plate (23). A force-bearing arm (312) is formed on the upper part of the force-bearing base plate (311). A guide sleeve (313) is fixedly installed on the upper end of the force-bearing arm (312). The guide rod (242) passes through the guide sleeve (313). The guide rod (242) is threaded with a nut sleeve (314), the bottom of the bed board (25) is fixedly installed with a connecting seat (315), and a drive arm (316) is pinned between the nut sleeve (314) and the connecting seat (315). The force-bearing arm (312) and the driving arm (316) are inclined in the same direction.

6. A linear accelerator device with offset compensation function according to claim 5, characterized in that: It also includes two drive seats (317) fixedly installed on the base plate (23). The drive seats (317) are rotatably connected to a worm gear (318) and a gear sleeve (319). A ring tooth portion (246) is formed on the outside of the guide rod (242), and the ring tooth portion (246) meshes with the inside of the gear sleeve (319). The outer side of the gear sleeve (319) is formed with a worm gear part (310), which meshes with the worm (318) for transmission. A dual-axis motor (26) is also fixedly installed above the base plate (23), and the two shaft ends of the dual-axis motor (26) are respectively fixed to the two worms (318).

7. A linear accelerator device with offset compensation function according to claim 5, characterized in that: The reinforcing component (32) includes: A sleeve (321) pinned to the force-bearing arm (312); and Rotate the swivel ring (322) connected to the outside of the guide rod (242); A connecting rod (323) is pinned below the swivel (322), and the end of the connecting rod (323) is inserted into the sleeve (321).

8. A linear accelerator device with offset compensation function according to claim 7, characterized in that: A bracket (324) is fixedly installed at the end of the sleeve (321), and an electromagnetic push rod (325) is fixedly installed on the outside of the bracket (324). The shaft end of the electromagnetic push rod (325) passes through the sleeve (321). The outer side of the connecting rod (323) is provided with a slot (326) that engages with the shaft end of the electromagnetic push rod (325).

9. A linear accelerator device with offset compensation function according to any one of claims 1-8, characterized in that: The treatment mechanism (1) includes a fixed frame (11) and a rotating frame (12) rotatably connected to the front end of the fixed frame (11), and a treatment head (13) is installed below the end of the rotating frame (12).

10. A linear accelerator device with offset compensation function according to any one of claims 1-8, characterized in that: The lifting assembly (22) is a scissor lift assembly connected between the base plate (21) and the bottom plate (23).

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