CN115061177B - Physical dose measuring instrument for simulating lung movement for radiotherapy - Google Patents

Abstract

The present invention discloses a physical dose measuring instrument for simulating lung movement for radiotherapy, comprising a shell, a horizontal slideway is provided on the surface of the shell, a horizontal slider is connected to the inner wall of the horizontal slideway in a horizontal limited sliding manner, a transmission sleeve is fixedly connected to the upper surface of the horizontal slider, a lifting rod is connected to the inner wall of the transmission sleeve in an axial limited sliding manner, a load-bearing ring is fixedly connected to the arc profile of the lifting rod, a compression ring is movably connected to the arc profile of the lifting rod near the top, and a photosensitive film is fixedly connected between the opposite surfaces of the load-bearing ring and the compression ring. The present invention, through the coordinated use of the above structures, solves the problem that in actual use, due to the poor synchronization of the movement of traditional simulation equipment, it is difficult to truly simulate the movement of the lungs from multiple dimensions, and thus it is difficult to more accurately measure the radiation dose of the lungs and tumors that move three-dimensionally with the lungs, which brings inconvenience to use.

Description

A physical dose measuring instrument for simulating lung motion for radiotherapy

Technical Field

The invention relates to the technical field of physical dose measuring devices for radiotherapy, in particular to a physical dose measuring instrument for simulating lung movement for radiotherapy.

Background technique

At present, the physical dose in patients receiving precision radiotherapy is verified by the phantom offline dose verification method, which is to transplant the calculated dose in the patient into the phantom, and then measure the dose in the phantom. The accuracy and precision of the physical dose calculated by TPS are evaluated by comparing the measured dose in the phantom with the dose in the phantom output by TPS.

Traditional simulation equipment has poor synchronization in movement, making it difficult to truly simulate the movement of the lungs in multiple dimensions, and thus difficult to more accurately measure the radiation dose to the lungs and tumors that move three-dimensionally with the lungs, causing inconvenience in use.

Summary of the invention

The purpose of the present invention is to provide a physical dose measuring instrument for simulating lung motion for radiotherapy, which has the advantages of simulating lung motion in multiple dimensions and simulating multi-dimensional motion of lungs of different sizes, and solves the problems in the background technology.

To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a physical dose measuring instrument for simulating lung movement for radiotherapy, comprising a shell, a horizontal slideway is provided on the surface of the shell, a horizontal slider is connected to the inner wall of the horizontal slideway in a horizontal limit sliding manner, a transmission sleeve is fixedly connected to the upper surface of the horizontal slider, a lifting rod is connected to the inner wall of the transmission sleeve in an axial limit sliding manner, a load-bearing ring is fixedly connected to the arc profile of the lifting rod, a compression ring is movably connected to the arc profile of the lifting rod near the top, a photosensitive film is fixedly connected between the opposite surfaces of the load-bearing ring and the compression ring, a lifting cross plate is fixedly connected to the top of the lifting rod, and a lifting frame for horizontal limit sliding of the lifting cross plate is connected in an up and down sliding manner in the upper space of the shell.

Preferably, the shell is provided with a transmission device that drives the lifting horizontal plate to perform reciprocating lifting and lowering. The transmission device includes a transmission vertical plate. The transmission vertical plate passes through the upper surface of the shell and is connected to the shell for sliding up and down. The transmission vertical plate is driven by a power mechanism and performs reciprocating lifting and lowering. The surface of the lifting frame is fixedly connected to the surface of the transmission vertical plate near the top.

Preferably, the transmission vertical plate is provided with a transmission device 2 for driving the horizontal slider to perform reciprocating horizontal movement in the horizontal slide, the transmission device 2 includes a transmission ring fixed at the bottom of the transmission vertical plate, the inner wall of the transmission ring is provided with a rotating column 1, the surface of the rotating column 1 is fixedly connected with a fixedly connected inclined guide bar, the surface of the rotating column 1 is movably connected with a rotating column 2 radially penetrated by the inclined guide bar, the arc-shaped contour of the rotating column 2 is sleeved with a connecting ring, and the arc-shaped contour of the connecting ring is fixedly connected with two limit cross bars that penetrate the outer shell and slide with the outer shell.

Preferably, the opposing surfaces of the carrying ring and the pressure ring are fixedly connected with a simulated airbag, and the surface of the photosensitive film is fixedly connected to the arc-shaped contour of the simulated airbag.

Preferably, an auxiliary device for increasing or decreasing the gas in the simulated airbag is fixedly connected to the surface of the transmission vertical plate, and the auxiliary device includes a mounting frame fixed on the surface of the transmission vertical plate, and the inner wall of the mounting frame is slidingly connected to a transmission pressure plate, and an air storage bag is fixedly connected to the opposite surfaces of the transmission pressure plate and the transmission vertical plate, and an air guide tube is connected between the air storage bag and the simulated airbag, and a compression spring is sleeved around the arc-shaped contour near the top of the lifting rod, and both ends of the compression spring are fixedly connected to the opposite surfaces of the lifting horizontal plate and the compression ring, and a screw is rotatably connected to the side of the transmission pressure plate away from the air storage bag, and an internal threaded hole threaded with the screw is opened on the surface of the mounting frame.

Preferably, the transmission pressure plate is provided with an auxiliary device 2 for adjusting the horizontal movement of the limit cross bar relative to the transmission vertical plate, the auxiliary device 2 includes an inclined guide plate rotatably connected to the transmission pressure plate on the side away from the transmission sleeve, a guide groove is provided on the surface of the inclined guide plate, the rotating column 1 is connected to the inner wall of the transmission ring for limiting rotation, and a guide block slidably connected to the inner wall of the guide groove is fixedly connected at the center of the rotating column 1.

Preferably, the guide block is a rectangular sliding block, and the guide through groove is a through groove matched with the guide block.

Preferably, a movable through groove is provided on the upper surface of the shell, and the inclined guide plate is located in the movable through groove.

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

1. The present invention uses the shell to play an overall fixed support role, the horizontal slider performs horizontal reciprocating motion in the horizontal slideway, the transmission sleeve and the lifting rod play a transmission role, driving the load-bearing ring and the compression ring to move horizontally synchronously, so that the photosensitive film moves horizontally synchronously. Through the horizontal movement of the photosensitive film, the horizontal movement of the lungs and the tumor on the lungs can be simulated in real time. Through the vertical movement of the lifting frame, the lifting cross plate is driven to move synchronously in the vertical direction, and the lifting cross plate also drives the lifting rod to perform lifting motion relative to the transmission sleeve, so that the lungs and tumors simulated by the photosensitive film move in the vertical direction, thereby simulating the movement of the moving lungs and tumors in two dimensions.

Finally, the actual physical exposure dose actually produced on the photosensitive film during the test is calculated by computer, thereby deducing the difference between the expected exposure intensity and the actual dose, which helps to calculate the preset exposure dose required to achieve the predetermined exposure dose, and is beneficial to improving the accuracy of actual human exposure.

2. The present invention enables the photosensitive film to perform multi-dimensional compound motion by combining the transmission device 1 and the transmission device 2 to move vertically and horizontally.

3. The present invention, through the coordinated use of the above-mentioned structures, solves the problem that in actual use, due to the poor synchronization of the movement of traditional simulation equipment, it is difficult to truly simulate the movement of the lungs from multiple dimensions, and further it is difficult to more accurately measure the radiation dose of the lungs and the tumor that moves three-dimensionally with the lungs, which brings inconvenience to use.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view of a housing of the present invention;

FIG2 is a perspective view of a rotating column 1 of the present invention;

FIG3 is a perspective view of the internal structure of the housing of the present invention;

FIG4 is a perspective view of the guide block of the present invention;

FIG5 is a three-dimensional view of the rotating column 2 of the present invention after being penetrated by the inclined guide strip;

FIG6 is a perspective view of a simulated airbag of the present invention;

FIG. 7 is a perspective view of the transmission ring of the present invention.

In the figure: 1. shell; 2. horizontal slide; 3. horizontal slider; 4. transmission sleeve; 5. lifting rod; 6. bearing ring; 7. compression ring; 8. photosensitive film; 9. lifting horizontal plate; 10. lifting frame; 11. transmission vertical plate; 12. transmission ring; 13. rotating column one; 14. inclined guide strip; 15. rotating column two; 16. connecting ring; 17. limiting cross bar; 18. simulated air bag; 19. installation frame; 20. transmission pressure plate; 21. air storage bag; 22. air guide tube; 23. compression spring; 24. screw; 25. inclined guide plate; 26. guide slot; 28. guide block; 29. movable slot.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment 1

The present invention provides a technical solution: a physical dose measuring instrument for simulating lung movement for radiotherapy, comprising a shell 1, which plays an overall fixed support role, and a horizontal slide 2 is provided on the surface of the shell 1, which provides a horizontal movement track for a horizontal slider 3.

The inner wall of the horizontal slide 2 is horizontally limited and slidably connected with a horizontal slider 3, and the horizontal slider 3 performs horizontal reciprocating motion in the horizontal slide 2. The upper surface of the horizontal slider 3 is fixedly connected with a transmission sleeve 4, and the inner wall of the transmission sleeve 4 is axially limited and slidably connected with a lifting rod 5. A load-bearing ring 6 is fixedly connected to the arc profile of the lifting rod 5, and a compression ring 7 is movably connected to the arc profile of the lifting rod 5 near the top. A photosensitive film 8 is fixedly connected between the opposite surfaces of the load-bearing ring 6 and the compression ring 7. The transmission sleeve 4 and the lifting rod 5 play a transmission role, driving the load-bearing ring 6 and the compression ring 7 to move horizontally synchronously, so that the photosensitive film 8 moves horizontally synchronously. Through the horizontal movement of the photosensitive film 8, the horizontal movement of the lungs and the tumor on the lungs can be simulated in real time;

A lifting horizontal plate 9 is fixedly connected to the top of the lifting rod 5, and a lifting frame 10 for horizontal limiting sliding of the lifting horizontal plate 9 is slidably connected up and down in the upper space of the shell 1.

Referring to Figure 1, the movement of the lifting frame 10 in the vertical direction drives the lifting horizontal plate 9 to move synchronously in the vertical direction, and the lifting horizontal plate 9 also drives the lifting rod 5 to move up and down relative to the transmission sleeve 4, thereby causing the lungs and tumors simulated by the photosensitive film 8 to move in the vertical direction, thereby simulating the movement of the moving lungs and tumors in two dimensions.

Finally, the actual physical radiation dose actually generated on the photosensitive film 8 during the test is calculated by a computer, thereby deducing the difference between the expected radiation intensity and the actual dose, which helps to calculate the preset radiation dose required to achieve the predetermined radiation dose, and is beneficial to improving the accuracy of the actual human body radiation dose.

Embodiment 2

On the basis of the first embodiment, furthermore, a transmission device 1 is provided on the outer shell 1 to drive the lifting horizontal plate 9 to perform reciprocating lifting. The transmission device 1 includes a transmission vertical plate 11. The transmission vertical plate 11 passes through the upper surface of the outer shell 1 and is connected to the outer shell 1 for sliding up and down. The transmission vertical plate 11 is driven by a power mechanism and performs reciprocating lifting. The surface of the lifting frame 10 is fixedly connected to the surface of the transmission vertical plate 11 near the top.

Refer to Figures 1, 2 and 3.

The transmission riser 11 is driven to move up and down reciprocatingly by a power mechanism, and the power mechanism is an electric push rod, which passes through the upper surface of the housing 1 through the transmission riser 11, so that the movement trajectory of the transmission riser 11 will be more stable.

By lifting and lowering the transmission vertical plate 11, the lifting frame 10 connected thereto is driven to lift and lower, thereby causing the lifting horizontal plate 9 in the lifting frame 10 and the transmission sleeve 4 on the lower surface of the lifting horizontal plate 9 to lift and lower synchronously, and the lifting and lowering of the carrying ring 6 and the pressure ring 7 are realized through the photosensitive film 8, and finally the vertical movement of the photosensitive film 8 is realized.

Embodiment 3

On the basis of the second embodiment, further: a transmission device 2 is provided on the transmission vertical plate 11 to drive the horizontal slider 3 to perform reciprocating horizontal movement in the horizontal slide 2, and the transmission device 2 includes a transmission ring 12 fixed at the bottom of the transmission vertical plate 11, and the inner wall of the transmission ring 12 is provided with a rotating column 13, and the surface of the rotating column 13 is fixedly connected with a fixedly connected inclined guide bar 14, and the surface of the rotating column 13 is movably connected with a rotating column 2 15 radially penetrated by the inclined guide bar 14, and the arc-shaped contour of the rotating column 2 15 is sleeved with a connecting ring 16, and the arc-shaped contour of the connecting ring 16 is fixedly connected with two limit cross bars 17 that penetrate the outer shell 1 and slide with the outer shell 1.

Refer to Figure 3 and Figure 2.

First, the movement trajectory of the connecting ring 16 in the outer shell 1 is restricted by the limiting cross bar 17, so that the connecting ring 16 can stably move horizontally back and forth in the outer shell 1, and the connecting ring 16 drives the synchronous movement of the horizontal slider 3, thereby enabling the transmission sleeve 4, the lifting rod 5, the load-bearing ring 6, the compression ring 7 and the photosensitive film 8 to move horizontally.

The transmission ring 12 moves in the vertical direction synchronously with the transmission vertical plate 11, and the rotating column 13 and the inclined guide bar 14 move downward synchronously. The inclined guide bar 14 is inclined on the rotating column 13 relative to the rotating column 2 15. As the inclined guide bar 14 moves downward, under the action of the horizontal component force on the inclined guide bar 14, the rotating column 2 15 moves horizontally with the connecting ring 16.

Thus, the horizontal movement and the vertical movement of the photosensitive film 8 are superimposed, which can simulate the actual motion state more realistically.

Embodiment 4

On the basis of the third embodiment, furthermore: the opposite surfaces of the carrying ring 6 and the pressing ring 7 are fixedly connected with a simulated airbag 18 , and the surface of the photosensitive film 8 is fixedly connected with the arc-shaped contour of the simulated airbag 18 .

Refer to Figure 3 and Figure 2.

Since the compression ring 7 is axially slidably connected to the lifting rod 5, as the gas in the simulated airbag 18 increases, the compression ring 7 will be propped up, so that the expansion area of the photosensitive film 8 will increase, which can simulate the larger area of the adult lung organ. Conversely, when the gas in the simulated airbag 18 is transferred out, the simulated airbag 18 shrinks, the compression ring 7 descends, and the expansion area of the photosensitive film 8 decreases, which is suitable for simulating a smaller area of the lung organ.

Furthermore, an auxiliary device for increasing or decreasing the gas in the simulated airbag 18 is fixedly connected to the surface of the transmission vertical plate 11, and the auxiliary device includes a mounting frame 19 fixed on the surface of the transmission vertical plate 11, and a transmission pressure plate 20 is slidingly connected to the inner wall of the mounting frame 19, and an air storage bag 21 is fixedly connected to the opposite surface of the transmission pressure plate 20 and the transmission vertical plate 11, and an air guide tube 22 is connected between the air storage bag 21 and the simulated airbag 18, and a compression spring 23 is sleeved around the arc-shaped contour near the top of the lifting rod 5, and the two ends of the compression spring 23 are fixedly connected to the opposite surfaces of the lifting horizontal plate 9 and the compression ring 7, and a screw rod 24 is rotatably connected to the side of the transmission pressure plate 20 away from the air storage bag 21, and an internal threaded hole threadedly connected to the screw rod 24 is opened on the surface of the mounting frame 19.

Referring to FIG3 , by manually driving the screw rod 24 to rotate in the internal threaded hole on the mounting frame 19, the screw rod 24 can rotate relative to the mounting frame 19 and also move axially, so that the transmission pressure plate 20 connected to the screw rod 24 for fixed-axis rotation will synchronously slide horizontally in the mounting frame 19, thereby squeezing the air storage bag 21. Different squeezing degrees will cause different amounts of gas in the air storage bag 21 to enter the simulated air bag 18 through the air guide tube 22, and the gas in the simulated air bag 18 will be replenished or transferred out. In addition, during the expansion or contraction process, the simulated air bag 18 will also move horizontally in the direction perpendicular to the limit cross bar 17 on the horizontal plane, further causing the photosensitive film 8 to move in another horizontal dimension, which can more realistically simulate the actual movement of the lungs.

The compression spring 23 can make the compression ring 7 tightly contact and squeeze the top of the simulated airbag 18 .

Embodiment 5

On the basis of the fourth embodiment, further: the transmission pressure plate 20 is provided with an auxiliary device 2 for adjusting the horizontal movement of the limit cross bar 17 relative to the transmission vertical plate 11, the auxiliary device 2 includes an inclined guide plate 25 which is rotatably connected to the transmission pressure plate 20 on the side away from the transmission sleeve 4, and a guide groove 26 is provided on the surface of the inclined guide plate 25. The rotating column 13 is rotatably connected to the inner wall of the transmission ring 12, and a guide block 28 which is slidably connected to the inner wall of the guide groove 26 is fixedly connected at the center of the rotating column 13.

Refer to Figures 1, 3 and 5.

When the transmission pressure plate 20 slides in the installation frame 19, the horizontal component will cause the guide groove 26 to rotate with the guide block 28 and the rotating column 13 in the transmission ring 12, thereby adjusting the angle of the inclined guide bar 14, and then changing the ratio of the horizontal movement distance of the limiting cross bar 17 and the vertical movement distance of the transmission vertical plate 11, which can further simulate the differences in vertical and horizontal movements due to differences in lung size among different users, and further improve the accuracy of the final measurement.

By providing the guide through groove 26 , the vertical movement of the inclined guide plate 25 relative to the guide block 28 can be buffered.

Furthermore, the guide block 28 is a rectangular sliding block, and the guide through groove 26 is a through groove matched with the guide block 28 .

Referring to Figure 4, through the setting of the rectangular slider and the setting of the guide slot 26 as a slot that is compatible with the guide block 28, the guide block 28 is more easily driven by the rotation of the guide slot 26, driving the rotating column 13 to rotate in the transmission ring 12. At this time, the rotating column 13 and the transmission ring 12 are in a limited rotation connection relationship.

Furthermore, a movable through groove 29 is opened on the upper surface of the shell 1, and the inclined guide plate 25 is in the movable through groove 29. The opening of the movable through groove 29 enables the inclined guide plate 25 to move smoothly in the shell 1. During actual use, the front and rear dimensions of the movable through groove 29 can be further reduced, so that the surface of the inclined guide plate 25 is slidably connected to the inner wall of the movable through groove 29, thereby ensuring that the movement of the inclined guide plate 25 is limited and the movement will be more stable.

Working principle: When the physical dose meter for simulating lung movement for radiotherapy is used, the outer shell 1 plays an overall fixed support role, the horizontal slider 3 performs horizontal reciprocating motion in the horizontal slide 2, the transmission sleeve 4 and the lifting rod 5 play a transmission role, driving the load-bearing ring 6 and the compression ring 7 to move horizontally synchronously, so that the photosensitive film 8 moves horizontally synchronously. Through the horizontal movement of the photosensitive film 8, the horizontal movement of the lungs and the tumor on the lungs can be simulated in real time. Through the vertical movement of the lifting frame 10, the lifting cross plate 9 is driven to move synchronously in the vertical direction, and the lifting cross plate 9 also drives the lifting rod 5 to perform lifting motion relative to the transmission sleeve 4, so that the lungs and tumors simulated by the photosensitive film 8 move in the vertical direction, thereby simulating the movement of the moving lungs and tumors from two dimensions.

Finally, the actual physical radiation dose actually generated on the photosensitive film 8 during the test is calculated by a computer, thereby deducing the difference between the expected radiation intensity and the actual dose, which helps to calculate the preset radiation dose required to achieve the predetermined radiation dose, and is beneficial to improving the accuracy of the actual human body radiation dose.

In the present invention, the cooperation of the transmission device 1 and the transmission device 2 enables the movement of the photosensitive film 8 in the vertical and horizontal directions to be compounded and superimposed, so that the photosensitive film 8 can perform multi-dimensional compound movement.

The present invention, through the coordinated use of the above-mentioned structures, solves the problem that in actual use, due to the poor synchronization of the movement of traditional simulation equipment, it is difficult to truly simulate the movement of the lungs from multiple dimensions, and further it is difficult to more accurately measure the radiation dose of the lungs and tumors that move three-dimensionally with the lungs, which brings inconvenience to use.

The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be processed directly according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. A physical dose-measuring instrument for simulating lung movement for radiation therapy, characterized in that: the device comprises a shell (1), a horizontal slideway (2) is arranged on the surface of the shell (1), a horizontal sliding block (3) is connected with the inner wall of the horizontal slideway (2) in a horizontal limiting sliding manner, a transmission sleeve (4) is fixedly connected with the upper surface of the horizontal sliding block (3), a lifting rod (5) is connected with the inner wall of the transmission sleeve (4) in an axial limiting sliding manner, a bearing ring (6) is fixedly connected to the arc-shaped outline of the lifting rod (5), a pressing ring (7) is movably connected to the arc-shaped outline, close to the top, of the lifting rod (5), a photosensitive film (8) is fixedly connected between the opposite surfaces of the bearing ring (6) and the pressing ring (7), a lifting transverse plate (9) is fixedly connected to the top of the lifting rod (5), and a lifting frame (10) for horizontally limiting and sliding of the lifting transverse plate (9) is connected to the upper space in the upper space of the shell (1).

The shell (1) is provided with a first transmission device for driving the lifting transverse plate (9) to lift in a reciprocating manner, the first transmission device comprises a transmission vertical plate (11), the transmission vertical plate (11) penetrates through the upper surface of the shell (1) and is connected with the shell (1) in an up-down sliding manner, the transmission vertical plate (11) is driven by a power mechanism and lifts in a reciprocating manner, and the surface of the lifting frame (10) is fixedly connected with the surface, close to the top, of the transmission vertical plate (11);

The transmission vertical plate (11) is provided with a transmission device II which drives the horizontal sliding block (3) to reciprocate in the horizontal sliding way (2), the transmission device II comprises a transmission ring (12) fixed at the bottom of the transmission vertical plate (11), the inner wall of the transmission ring (12) is provided with a first rotating column (13), the surface of the first rotating column (13) is fixedly connected with an inclined guide strip (14) which is fixedly connected with, the surface of the first rotating column (13) is movably connected with a second rotating column (15) which is radially penetrated by the inclined guide strip (14), a connecting ring (16) is sleeved on the arc-shaped outline of the second rotating column (15), and two limiting cross rods (17) which penetrate through the shell (1) and are in limiting sliding with the shell (1) are fixedly connected on the arc-shaped outline of the connecting ring (16);

The opposite surfaces of the bearing ring (6) and the pressing ring (7) are fixedly connected with a simulation air bag (18), and the surface of the photosensitive film (8) is fixedly connected with the arc-shaped outline of the simulation air bag (18);

The device is characterized in that an auxiliary device I for increasing and decreasing the air in the simulation air bag (18) is fixedly connected to the surface of the transmission vertical plate (11), the auxiliary device comprises a mounting frame (19) fixed on the surface of the transmission vertical plate (11), a transmission pressing plate (20) is fixedly connected to the inner wall of the mounting frame (19) in a limiting sliding mode, an air storage bag (21) is fixedly connected to the opposite surface of the transmission pressing plate (20) and the transmission vertical plate (11), an air duct (22) is communicated between the air storage bag (21) and the simulation air bag (18), a pressure spring (23) is sleeved around an arc-shaped outline close to the top on the lifting rod (5), two ends of the pressure spring (23) are fixedly connected with the opposite surfaces of the lifting transverse plate (9) and the pressing ring (7), one side of the transmission pressing plate (20) away from the air storage bag (21) is fixedly connected with a screw (24) in a rotating mode, and an inner threaded hole is formed in the surface of the mounting frame (19) and is in a threaded mode.

2. A physical dosimeter for simulating pulmonary motion for radiation therapy according to claim 1, wherein: be equipped with on transmission clamp plate (20) and make spacing horizontal pole (17) relative transmission riser (11) horizontal migration carry out auxiliary device second of adjusting, auxiliary device second includes that dead axle rotates to be connected and keeps away from inclined deflector (25) on transmission sleeve (4) one side on transmission clamp plate (20), direction logical groove (26) have been seted up to the surface of inclined deflector (25), the spacing rotation of inner wall of rotation post (13) and transmission ring (12) is connected, centre of a circle department fixedly connected with of rotation post (13) lead to guide shifting block (28) of groove (26) inner wall sliding connection.

3. A physical dosimeter for simulating pulmonary motion for radiation therapy according to claim 2, wherein: the guide shifting block (28) is a rectangular sliding block, and the guide through groove (26) is a through groove matched with the guide shifting block (28).

4. A radiation therapy simulated pulmonary motion physical dosimeter as in claim 3, wherein: the upper surface of the shell (1) is provided with a movable through groove (29), and the inclined guide plate (25) is positioned in the movable through groove (29).