A proton accelerator treatment system

Abstract

The application is a kind of proton accelerator treatment system, comprising: support, beam guiding system, beam distribution system, beam guiding positioning system; the support comprises two rectangular vertical plates with semicircular openings processed at the front ends; the beam guiding system is clamped between the two rectangular vertical plates, comprising secondary magnet A, secondary magnet B and deflection magnet through which the beam passes in sequence; the secondary magnet B can slide up and down along the vertical direction, comprising two magnetic poles B, and the magnetic pole B is a vertical rectangular magnetic pole in the beam propagation direction. In the application, the secondary magnet B that can slide up and down is arranged in the beam guiding system of the proton accelerator treatment system, so that the beam is more in line with the treatment requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to a proton accelerator treatment system. BACKGROUND

[0002] The proton accelerator treatment is a kind of principle of using electromagnetic acceleration to accelerate protons, and finally through the heavy metal target of bombarding toughness radiation, so as to provide the required X or E line radiation beam for clinical radiotherapy, and the X or E line has the destruction and proliferation inhibition effect on tumor cells, so that the "radiotherapy" is to achieve the treatment purpose.

[0003] At present, the proton accelerator treatment system generally includes a support, a beam guiding system, a beam distribution system, a beam guiding positioning system, etc., the fast moving protons generate toughness radiation by bombarding the heavy metal target, and generate the required X or E line radiation beam for clinical radiotherapy, which is irradiated to the lesion (tumor) of the patient hiding on the treatment bed through the beam guiding system, the beam distribution system, the beam guiding positioning system and the treatment bed in the support, so as to realize the radiotherapy of the patient.

[0004] However, in the current beam guiding system, only a set of two magnetic poles with the opposite surfaces being vertical two-stage magnets are used, and the beam guiding thereof cannot meet the needs of treatment. SUMMARY

[0005] The purpose of the present application is to overcome the deficiency that in the current proton accelerator treatment system, only a set of two magnetic poles with the opposite surfaces being vertical two-stage magnets are used in the beam guiding system, and the beam guiding thereof cannot meet the needs of treatment, and to provide a proton accelerator treatment system with two sets of two-stage magnets in the beam guiding system.

[0006] The technical scheme adopted by the present application to achieve the technical purpose is as follows: a proton accelerator treatment system, comprising: a support, a beam guiding system, a beam distribution system, a beam guiding positioning system; the support comprises two rectangular vertical plates with semicircular openings processed at the front ends and arranged oppositely; the beam guiding system is clamped between the two rectangular vertical plates and comprises two-stage magnet A, two-stage magnet B and deflection magnet through which the beam passes in sequence.

[0007] The magnetic yoke A of the two-stage magnet A is fixedly clamped between the two rectangular vertical plates, and the two magnetic poles A are vertical rectangular magnetic poles in the beam propagation direction.

[0008] The two-stage magnet B can slide up and down in the vertical direction and comprises two magnetic poles B, and the magnetic poles B are vertical rectangular magnetic poles in the beam propagation direction.

[0009] The deflection magnet comprises a pair of upper and lower deflection magnets with symmetrical structure, the upper and lower deflection magnets are mirror symmetrical relative to the horizontal plane of the beam propagation direction, the opposite surfaces of the two deflection poles of the upper and lower deflection magnets are parallel to the vertical plane of the beam propagation direction, and the side walls of the deflection yokes of the upper and lower deflection magnets are respectively connected with the inner surfaces of the two vertical rectangular plates.

[0010] Further, in the proton accelerator treatment system, the linear mechanism A is used to drive the secondary magnet B to slide vertically, the linear mechanism A comprises two vertical rectangular plates clamping the yoke B of the secondary magnet B, each of the two vertical rectangular plates is slidably connected with the linear guide rail A vertically arranged on the inner surface of the rectangular plate through the sliding block A, and the sliding block A is driven to slide on the linear guide rail A by the linear driving mechanism A.

[0011] Further, in the proton accelerator treatment system, the linear driving mechanism A is a screw-nut type structure.

[0012] Further, in the proton accelerator treatment system, the beam distribution system is arranged in a trapezoidal frame, and the trapezoidal frame is hung in a swing mechanism.

[0013] The swing mechanism comprises a pair of annular guide rail seats respectively embedded in the semicircular holes of the two rectangular plates, an arc-shaped guide rail installed in the annular guide rail seat, and a sliding block arranged on the two arc-shaped guide rails; the sliding block is connected with the outer surfaces of the two arms of the U-shaped structure at the upper end of the trapezoidal frame, so that the trapezoidal frame of the beam distribution system swings in the arc-shaped guide rail.

[0014] Further, in the proton accelerator treatment system, the inner arc surface of the annular guide rail seat is processed with an arc-shaped rack, the two arc-shaped racks are movably connected with a gear, the gear is movably connected with a rotating mechanism installed in the middle of the lower surface of the horizontal plate of the U-shaped structure at the upper end of the trapezoidal frame, and the rotating mechanism is movably connected with a belt wheel type linkage mechanism installed at the rear end of the lower surface of the horizontal plate of the U-shaped structure.

[0015] Further, in the proton accelerator treatment system, the support comprises a treatment bed, and the treatment bed comprises a bed surface, a rotating mechanism A, an oscillating arm A, a rotating mechanism B, an oscillating arm B, a rotating mechanism C, a lifting mechanism B and a base.

[0016] The base is fixedly installed on a horizontal plane, and the lifting mechanism B is arranged on the base and provided with the rotating mechanism C with the top end axis perpendicular to the horizontal plane.

[0017] The rotating end of the rotating mechanism C is connected with the swing arm B, and the end of the swing arm B is provided with the rotating mechanism B, and the axial line of the rotating mechanism B is perpendicular to the horizontal plane.

[0018] The rotating end of the rotating mechanism B is connected with the swing arm A, and the end of the swing arm A is provided with the rotating mechanism A, and the axial line of the rotating mechanism A is perpendicular to the horizontal plane.

[0019] The bed surface is mounted at the rotating end of the rotating mechanism A.

[0020] Further, in the proton accelerator treatment system, the bed surface comprises a bed plate, and a rectangular plate A with two sides parallel to the long side of the bed plate is embedded on the upper surface of the bed plate at about one third of the long side of the bed plate, the upper surface of the rectangular plate A is flush with the upper surface of the bed plate, the lower surface of the bed plate is connected with a rectangular plate B, and the rectangular plate A and the rectangular plate B are symmetrically arranged on the bed plate.

[0021] Further, in the proton accelerator treatment system, the rotating mechanism A comprises a rotating shaft A with a flange on the top and perpendicular to the horizontal plane.

[0022] The upper surface of the flange of the rotating shaft A is connected with the bed surface.

[0023] Two bearings A are spaced apart on the rotating shaft A.

[0024] A motor A is arranged to drive the rotating shaft A.

[0025] A mounting seat A is formed by a circular through hole arranged at the end of the swing arm A to mount the rotating shaft A, the outer circle of the bearing A on the rotating shaft A is fixed with the mounting seat A, the motor A is fixedly arranged in the circular through hole of the swing arm A through a ring-shaped pressing plate, and the shaft of the motor A is connected with the rotating shaft A.

[0026] Further, in the proton accelerator treatment system, the rotating mechanism C comprises a circular plate A, the upper surface of the circular plate A is connected with the circular bottom surface of the end of the swing arm B, the lower surface of the circular plate A is connected with the inner ring of a gyration shaft with an axial line perpendicular to the horizontal plane, the outer ring of the gyration shaft is connected with a circular plate B, the upper surface of the circular plate B is connected with a motor C, and the motor C is arranged in the inner ring of the gyration shaft and movably connected with the circular plate A.

[0027] Further, in the proton accelerator treatment system, the lifting mechanism B comprises a vertical quadrangular column, the upper surface of the quadrangular column is connected with the surface of the circular plate B of the rotating mechanism C through the circular plate B, and the rotating mechanism C is supported.

[0028] Four side walls of the square column are connected with vertical linear guide rails B respectively, four linear guide rails B are connected with four groups of two sliders B respectively, four groups of two sliders B are connected with outer side walls of four triangular support upright walls respectively, inner side wall of an upright wall of one of the four triangular supports is connected with a vertical linear driving mechanism, and the linear driving mechanism is movably connected with one side wall of the square column; the linear driving mechanism can drive the square column to ascend and descend, and drive the rotating mechanism C to ascend and descend.

[0029] In the application, the secondary magnet B capable of sliding up and down is arranged in the beam guiding system of the proton accelerator treatment system, so that the beam is more in line with the treatment requirements.

[0030] The application will be described in detail below with reference to the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The structure general diagram of the particle accelerator treatment system in the embodiment 1 of the application;

[0032] Figure 2 The structure general diagram of the beam guiding system in the embodiment 1 of the application;

[0033] Figure 3 The structure diagram of the beam guiding system in the embodiment 1 of the application, one of the exploded views;

[0034] Figure 4 The structure diagram of the beam guiding system in the embodiment 1 of the application, two of the exploded views;

[0035] Figure 5 The structure diagram of the beam guiding system in the embodiment 1 of the application, three of the exploded views;

[0036] Figure 6 The structure diagram of the beam guiding system in the embodiment 1 of the application, four of the exploded views;

[0037] Figure 7 The structure diagram of the beam guiding system in the embodiment 1 of the application, five of the exploded views;

[0038] Figure 8 The principle diagram of the beam guiding system in the embodiment 1 of the application, one of the principle diagrams;

[0039] Figure 9 The principle diagram of the beam guiding system in the embodiment 1 of the application, two of the principle diagrams;

[0040] Figure 10 The principle diagram of the beam guiding system in the embodiment 1 of the application, three of the principle diagrams;

[0041] Figure 11 The principle diagram of the beam guiding system in the embodiment 1 of the application, four of the principle diagrams;

[0042] Figure 12 Figure 5 of the beam guiding system of the embodiment 1 of the present application;

[0043] Figure 13 Figure 6 of the beam guiding system of the embodiment 1 of the present application;

[0044] Figure 14 Figure 7 of the beam guiding system of the embodiment 1 of the present application;

[0045] Figure 15 Figure 8 of the beam guiding system of the embodiment 1 of the present application;

[0046] Figure 16 Figure 1 of the swing mechanism of the embodiment 1 of the present application;

[0047] Figure 17 Figure 2 of the swing mechanism of the embodiment 1 of the present application;

[0048] Figure 18 Figure 1 of the treatment bed of the embodiment 1 of the present application;

[0049] Figure 19 Figure 1 of the treatment bed of the embodiment 1 of the present application;

[0050] Figure 20 Figure 2 of the treatment bed of the embodiment 1 of the present application;

[0051] Figure 21 Figure 3 of the treatment bed of the embodiment 1 of the present application;

[0052] Figure 22 Figure 4 of the treatment bed of the embodiment 1 of the present application;

[0053] Figure 23 Figure 5 of the treatment bed of the embodiment 1 of the present application;

[0054] Figure 24 Figure 1 of the treatment bed of the embodiment 1 of the present application;

[0055] Figure 25 Figure 2 of the treatment bed of the embodiment 1 of the present application;

[0056] Figure 26 Figure 3 of the treatment bed of the embodiment 1 of the present application.

[0057] Figure 1 of the treatment bed of the embodiment 1 of the present application;

[0058] 1, rectangular base, 101, isocenter;

[0059] 2, rectangular stand;

[0060] 3, beam guiding system, 3-1, secondary magnet A, 3-1-1, magnetic pole A, 3-1-2, magnetic yoke A, 3-2, secondary magnet B, 3-2-1, magnetic pole B, 3-2-1, magnetic yoke B, 3-3, linear mechanism A, 3-3-1, vertical rectangular upright, 3-3-2, slider A, 3-3-3, linear guide A, 3-3-4, driving mechanism A, 3-4, deflection magnet, 3-4-1, deflection magnetic pole, 3-4-2, deflection magnetic yoke;

[0061] 301, beam A segment, 302, beam B segment, 303, beam C segment, 304, beam D segment, 305, beam E segment, 306, beam F segment, 307, beam G segment, 308, reference point;

[0062] 4, swing mechanism, 4-1, annular guide rail seat, 4-2, arc-shaped guide rail, 4-3, distribution slider, 4-4, distribution gear, 4-5, rotating mechanism, 4-6, belt wheel type linkage mechanism;

[0063] 5, trapezoidal frame;

[0064] 6, annular image guiding positioning system installation frame

[0065] 7, treatment bed, 7-1, bed surface, 7-1-1, bed plate, 7-1-2, rectangular plate A, 7-1-3, rectangular plate B, 7-2, rotating mechanism A, 7-2-1, rotating shaft A, 7-2-2, bearing A, 7-2-3, mounting seat A, 7-2-4, annular pressing plate A, 7-2-5, motor A, 7-3, swing arm A, 7-4, rotating mechanism B, 7-4-1, rotating shaft B, 7-4-2, bearing B, 7-4-3, mounting seat B, 7-4-4, annular pressing plate B, 7-4-5, motor B, 7-5, swing arm B, 7-6, rotating mechanism C, 7-6-1, circular plate A, 7-6-2, gyration shaft, 7-6-3, circular plate B, 7-6-4, motor C, 7-7, lifting mechanism B, 7-7-1, square upright, 7-7-2, linear guide B, 7-7-3, slider B, 7-7-4, triangular support, 7-7-5, linear driving mechanism B, 7-8, base. DETAILED DESCRIPTION

[0066] In the following description, an XYZ coordinate system is used, which is a right-angle coordinate system with the treatment isocenter 101 as the origin and the Z axis as the vertical axis, the XY plane is the horizontal plane, the YZ plane is the vertical plane of the observer's line of sight, and the XZ plane is the parallel plane of the observer's line of sight. In addition, the suffixes A, B, C, etc. only indicate the difference between components and cannot limit the components.

[0067] Embodiment 1, the embodiment is as Figure 1As shown in the figure, the proton accelerator treatment system of the embodiment includes a rectangular base 1, in a rectangular coordinate system with the origin of the X-axis Y-axis Z-axis as the treatment isocenter 101 and the Z-axis as the vertical axis, the surface of which is parallel to the XY plane and below the XY plane, the long side of which is parallel to the Y-axis, and two rectangular vertical plates 2 connected to the upper surface of the rectangular base 1, one end of which is processed with a semicircular opening with the X-axis as the center, and the two rectangular vertical plates 2 as the support body, the inner surface of which is parallel to the YZ plane and is in a mirror-symmetrical position relative to the YZ plane, defining the XZ plane as the reference, the direction of the rectangular base 1 and the rectangular vertical plate 2 as the negative direction of the Y-axis, and a beam guiding system 3 installed between the two rectangular vertical plates 2, a beam distribution system swing mechanism 4 installed in the semicircular opening at the front end of the rectangular vertical plate 2, the swing mechanism 4 connected to a trapezoidal beam distribution system installation trapezoidal frame 5 with the upper end of the U-shaped structure, the two vertical surfaces perpendicular to the X-axis, and the two inclined surfaces parallel to the X-axis, the trapezoidal frame 5 with the two inclined surfaces parallel to the X-axis connected to a ring-shaped image guiding positioning system installation frame 6 with the center of the inner ring coinciding with the X-axis, and a treatment bed 7 installed on the side of the ring-shaped image guiding positioning system installation frame 6 along the positive direction of the Y-axis.

[0068] As shown in the figure, Figure 2 In the embodiment, the beam guiding system 3 includes a two-stage magnet A3-1, a two-stage magnet B3-2 movable along the Z-axis direction, a Z-axis direction linear mechanism A3-3 driving the two-stage magnet B3-2 to move up and down, and a deflection magnet 3-4 arranged in order from far to near relative to the isocenter 101 along the positive direction of the Y-axis.

[0069] As shown in the figure, Figure 3 The geometric center of the two-stage magnet A3-1 coincides with the Y-axis as seen from the Y-axis direction, and the two magnetic poles A3-1-1 are rectangular, with the opposite surfaces parallel to the YZ plane and mirror-symmetric relative to the YZ plane, and the two side walls of the magnetic yoke A3-1-2 perpendicular to the X-axis are connected to the inner surfaces of the two rectangular vertical plates 2. In the figure, in order to see the two magnetic poles A3-1-1, the excitation coil is removed from the magnetic yoke A3-1-2 and drawn on the right side.

[0070] As shown in the figure, Figure 4 The two magnetic poles B3-2-1 of the two-stage magnet B3-2 are rectangular, with the opposite surfaces parallel to the YZ plane and mirror-symmetric relative to the YZ plane, and the front and rear end surfaces parallel to the XZ plane. In the figure, in order to see the two magnetic poles B3-2-1, the excitation coil is removed from the magnetic yoke B3-2-2 and drawn on the right side.

[0071] As shown in the figure, Figure 5As shown, the two side walls of the yoke B3-2-2 of the secondary magnet B3-2 perpendicular to the X axis are movably connected with the linear mechanism A3-3 along the Z axis direction, and the linear mechanism A3-3 includes two vertical rectangular plates 3-3-1 whose surfaces are perpendicular to the X axis, the inner surfaces of the two vertical rectangular plates 3-3-1 are respectively connected with the two side walls of the yoke B3-2-2 perpendicular to the X axis, the outer surfaces of each vertical rectangular plate 3-3-1 are connected with two groups of two sliders A3-3-2, the two groups of two sliders A3-3-2 are respectively movably connected with two linear guides A3-3-3 along the Z axis direction, the two linear guides A3-3-3 are connected with the inner surfaces of the rectangular plates 2 on the same side, and the two vertical rectangular plates 3-3-1 are simultaneously connected with a linear driving mechanism A3-3-4 along the Z axis direction, and the linear driving mechanism A3-3-4 is respectively connected with the inner surfaces of the two rectangular plates 2.

[0072] In this embodiment, the linear driving mechanism A3-3-4 is a screw-nut type structure, and four nuts are connected with the two vertical rectangular plates 3-3-1 respectively in two groups, and four screws are movably connected with each other through a belt mechanism, and one screw can drive the other screws to move up and down, thereby driving the secondary magnet B3-2 to move up and down. Since the linear driving mechanism A3-3-4 has various styles, other ways can also be used in other embodiments.

[0073] As shown in FIG. 3, Figure 6 The deflection magnet 3-4 has an upper and lower symmetric structure and is mirror-symmetric relative to the XY plane, the opposite surfaces of the two deflection magnetic poles 3-4-1 of the upper and lower deflection magnets 3-4 are parallel to the YZ plane and mirror-symmetric relative to the YZ plane, and the side walls of the deflection yokes 3-4-2 of the upper and lower deflection magnets 3-4 perpendicular to the X axis are respectively connected with the inner surfaces of the two rectangular plates 2.

[0074] In order to clearly show the two deflection magnetic poles 3-4-1 above, Figure 6 In this embodiment, the upper left excitation coil is moved to the left by a distance, and the deflection yoke 3-4-2 above is moved backward by a distance.

[0075] Since the coil around the cylindrical shape on the back side of the deflection magnetic pole 3-4-1 has various choices, different deflection magnets 3-4 can be selected in other embodiments.

[0076] As shown in FIG. 3, Figure 7 As shown in FIG. 3, from the X axis direction, the edge of the upper two deflection magnetic poles 3-4-1 of the two pairs of identical deflection magnetic poles 3-4-1 on the Y axis positive side is a circular arc shape with the center 101 as the center, the edge on the Y axis negative side is an irregular curve shape, and the upper edge is a circular arc shape.

[0077] The principle of the beam guiding system of this embodiment will be described below.

[0078] As Figure 8 shown, the beam guided by the beam guiding system 3 can be divided into 7 segments, namely, the beam segment A 301 to be injected into the magnetic pole A 3-1-1, the beam segment B 302 deflected by the magnetic pole A 3-1-1, the beam segment C 303 emitted from the magnetic pole A 3-1-1, the beam segment D 304 deflected by the magnetic pole B 3-2-1, the beam segment E 305 emitted from the magnetic pole B 3-2-1, the beam segment F 306 deflected by the deflection magnetic pole 3-4-1, and the beam segment G 307 emitted from the deflection magnetic pole 3-4-1.

[0079] The beam segment C 303 emitted from the magnetic pole A 3-1-1 is corrected once before being injected into the deflection magnetic pole 3-4-1. Without this correction, the beam segment G 307 emitted from the deflection magnetic pole 3-4-1 cannot be compared with the isocenter 101. This is determined by the manufacturing rules of the deflection magnetic pole 3-4-1.

[0080] Figure 9 It is demonstrated that the beam segment C 303 emitted from the magnetic pole A 3-1-1 is directly injected into the deflection magnetic pole 3-4-1 without deflection by the magnetic pole B 3-2-1 and is emitted after deflection. In the figure, the back side of the deflection magnetic pole 3-4-1 is marked with a plurality of reference points 308. The so-called reference point means that if the beam segment C 303 is injected into the deflection magnetic pole 3-4-1 at the position of the reference point 308, the beam can be deflected along the path of the beam segment F 306 and emitted along the path of the beam segment G 307, and finally handed over to the isocenter 101. However, in the embodiment, the edge of the back side of the deflection magnetic pole 3-4-1 is not completely planned according to the reference point 308, for the following three considerations:

[0081] 1) As Figure 10 shown, if the edge of the back side of the deflection magnetic pole 3-4-1 is planned according to the reference point 308 when the deflection of the beam segment G 107 is 0°, the edge of the back side of the deflection magnetic pole 3-4-1 will intersect the connection point of the inner side edge of the deflection magnetic pole 3-4-1 and the Y axis. The magnetic field strength of such a sharp magnetic pole will be distorted and not easy to control. Therefore, the edge of the back side of the deflection magnetic pole 3-4-1 at this segment is changed to a straight line connecting the 20° reference point 308 and the 10° reference point 308 and extending. This is a correction to the reference point 308.

[0082] Here Figure 10 is Figure 9 a partial enlarged view, and the numbers marked in the figure are the angles of the beam segment G 307 relative to the negative direction of the Y axis.

[0083] 2) As Figure 11As shown, the deflection radius of the beam F segment 306 is gradually increased from the 70° deflection of the beam G segment 307. The increase of the deflection radius means the decrease of the magnetic field strength between the two opposite deflection poles 3-4-1 of the deflection magnet 3-4. If the deflection radius of the beam F segment 306 is not increased, the reference point 308 of the beam F segment 307 beyond 70° will fall on the back side (right side in the figure) of the reference point 308, so that the beam G segment 307 beyond 70° cannot be realized. Here Figure 11 is Figure 9 a partial enlarged view.

[0084] After the deflection radius of the beam F segment 306 is increased, if the edge shape of the back side of the deflection pole 3-4-1 is still planned according to the reference point 308 beyond 70°, the edge curve will have convex and concave changes, which is not conducive to the regulation of the magnetic field strength, so the reference point 308 of the beam G segment 307 deflected by 60° and the reference point 308 of the beam G segment 307 deflected by 90° are connected into a straight line. This is again a modification of the reference point 308.

[0085] The edge shape of the back side of the deflection pole 3-4-1 modified according to the rules of 1) and 2) cannot guarantee that the beam G segment 307 emitted from the deflection pole 3-4-1 intersects with the isocenter 101.

[0086] 3) The edge shape of the back side of the deflection pole 3-4-1, even if it is a curved shape connecting the reference point 308 of the beam G segment 307 deflected by 20° and the reference point 308 of the beam G segment 307 deflected by 60°, cannot completely guarantee that the beam G segment 307 intersects with the isocenter. Because the pole face of the deflection pole 3-4-1 is large, and the winding column of the back side excitation coil thereof adopts an irregular design, it is difficult to guarantee that the magnetic field strength between the deflection poles 3-4-1 is everywhere equal. If the magnetic field strength can be everywhere equal, the deflected beam F segment 306 is a standard circular arc, and if it cannot be everywhere equal, the deflected beam F segment 306 is an irregular arc, so it cannot be guaranteed that the beam G segment 307 emitted from the deflection pole 3-4-1 intersects with the isocenter 101.

[0087] In order to make modifications to the back side edge of the deflection pole 3-4-1 relative to the reference point 308 and still guarantee that the beam G segment 307 intersects with the isocenter 101 in the case that the magnetic field strength between the deflection poles 3-4-1 cannot be absolutely uniform, there are two methods, one is to make modifications to the direction of the beam C segment 303, and the other is to make modifications to the direction of the beam G segment 307, and the embodiment adopts the method of making modifications to the beam C segment 303. This is the reason for setting the secondary pole B3-2, which is also called the correction magnet.

[0088] How does the secondary magnet B (3-2) work:

[0089] 1) Generation of the beam C segment 303

[0090] As Figure 12 shown, assuming the magnetic field strength between the two poles of the magnet A3-1 is uniform, the beam B segment 302 deflected by the pole A3-1-1 is an arc with different radii, and each beam C segment 303 emitted from the pole A3-1-1 is tangent to the corresponding arc beam B segment 302. As the magnetic field strength of the magnet A3-1 continuously changes, the angle between the beam C segment 303 emitted from the pole A3-1-1 and the Y axis also continuously changes.

[0091] 2) The retrograde beam E segment 305

[0092] As Figure 13 shown, according to the treatment needs, the retrograde beam G segment 307 is first determined, and the retrograde deflected beam F segment 306 can be generated at a certain magnetic field strength. The beam F segment 306 is emitted from the back side of the deflection pole 3-4-1 to form the retrograde beam E segment 105, which is emitted from the right side wall of the pole B3-2-1 of the liftable secondary magnet B3-2.

[0093] 3) Formation of the beam 304

[0094] As Figure 14 shown, the extension of the beam E segment 305 goes into the pole B3-2-1. By adjusting the magnetic field strength of the secondary magnet A3-1, the angle between the straight beam C segment 303 and the Y axis is adjusted, so that the extension of the beam C segment 303 in the pole B3-2-1 is compared with the extension of the beam E segment 305 in the pole B3-2-1 relative to the O point. In the figure, the A point is the position of the beam C segment 303 when it enters the left side boundary of the pole B3-2-1, and the B point is the position of the beam E segment 305 when it enters the right side boundary of the pole B3-2-1. It is required that the distance OA is equal to the distance OB. Then a circle is drawn tangent to the beam C segment 303 at the A point and tangent to the beam E segment 305 at the B point. The circular arc connecting the A point and the B point is the beam D segment 304. The process of forming the beam D segment 304 is the modification process of the pole B3-2-1.

[0095] Figure 15 is Figure 14 a close-up view. As can be seen in the figure, the curvature of the beam D segment 304 is very small, close to a straight line.

[0096] As Figure 8 shown, the retrograde beam E segment 305 is emitted from the arc segment at the back side of the deflection pole 3-4-1, so the beam D segment 304 is a straight line. This is based on the assumption that the magnetic field strength between the two deflection poles 3-4-1 is uniform. If it is not uniform, the beam D segment 304 is an arc with very small curvature.

[0097] As Figure 16As shown, the beam delivery system swing mechanism 4 includes two annular guide rail seats 4-1, the outer arc surfaces of which are connected with the inner arc surfaces of the semicircular openings of the two rectangular vertical plates 2, the inner side surfaces parallel to the YZ plane and mirror symmetric with respect to the YZ plane are connected with two arc-shaped guide rails 4-2 with the centers coinciding with the X axis, the two arc-shaped guide rails 4-2 are movably connected with two groups of two delivery sliders 4-3 respectively, the two groups of two delivery sliders 4-3 are connected with the outer surfaces of the two arms of the U-shaped structure on the upper end of the trapezoidal beam delivery system installation trapezoidal frame 5 respectively, and the inner arc surfaces of the two annular guide rail seats 4-1 are provided with arc-shaped racks, the two arc-shaped racks are movably connected with two delivery gears 4-4 with the axis lines parallel to the X axis, and the two delivery gears 4-4 are movably connected with two rotating mechanisms 4-5 installed on the lower surface of the horizontal plate of the U-shaped structure on the upper end of the trapezoidal beam delivery system installation trapezoidal frame 5 respectively, and the two rotating mechanisms 4-5 are movably connected with a pulley type linkage mechanism 4-6 installed at the rear end of the lower surface of the horizontal plate of the U-shaped structure.

[0098] As shown in the figure, Figure 17 The trapezoidal beam delivery system installation trapezoidal frame 5 is connected with two inclined surfaces parallel to the X axis and an inner annular image guide system installation frame 6 with the center coinciding with the X axis.

[0099] The annular image guide system installation frame 6 uses the existing technology.

[0100] As shown in the figure, Figure 18 The treatment bed 7 includes a bed surface 7-1, a rotating mechanism A7-2 with the axis line parallel to the Z axis, a swing arm A7-3, a rotating mechanism B7-4 with the axis line parallel to the Z axis, a swing arm B7-5, a rotating mechanism C7-6 with the axis line parallel to the Z axis, a Z axis direction lifting mechanism B7-7 and a base 7-8 connected in sequence.

[0101] As shown in the figure, Figure 19 The bed surface 7-1 includes an elongated bed plate 7-1-1 with the surface perpendicular to the Z axis, an upper surface of about one third of the long side of the bed plate 7-1-1 is embedded with a rectangular plate A7-1-2 with the two sides parallel to the long side of the bed plate 7-1-1, and the upper surface of the rectangular plate A7-1-2 is flush with the upper surface of the bed plate 7-1-1, the lower surface of the bed plate 7-1-1 is connected with a rectangular plate B7-1-3 with the two sides parallel to the long side of the bed plate 7-1-1, the rectangular plate A7-1-2 and the rectangular plate B7-1-3 are aligned vertically along the Z axis, and the bed plate 7-1-1 is clamped by bolts.

[0102] As shown in the figure, Figure 20As shown, the lower surface of clamping plate B7-1-3 is connected to a rotating mechanism A7-2 whose axis of rotation is parallel to the Z-axis. The rotating mechanism A7-2 includes a rotating shaft A7-2-1 with its axis of rotation parallel to the Z-axis. The upper surface of the flange of rotating shaft A7-2-1 is connected to the lower surface of clamping plate B7-1-3. The shaft section of rotating shaft A7-2-1 is movably connected to two bearings A7-2-2 spaced apart. The two bearings A7-2-2 are embedded from below into a machined recessed area. In the countersunk hole of the through-hole bearing mounting seat A7-2-3, the bottom surface of the mounting seat A7-2-3 is connected to an annular pressure plate A7-2-4. The annular pressure plate A7-2-4 presses down on two bearings A7-2-2. The bottom surface of the annular pressure plate A7-2-4 is connected to a motor A7-2-5. The motor A7-2-5 is movably connected to the rotating shaft A7-2-1. The electrode A7-2-5 can drive the rotating shaft A7-2-1 to rotate, thereby driving the bed board 7-1-1 to rotate.

[0103] The bearing mounting base A7-2-3 has an arc surface on one side and a straight surface parallel to the Z-axis on the other side. The straight surface is connected to the straight surface parallel to the Z-axis at one end of a swing arm A7-3 whose upper and lower surfaces are parallel to the XY plane.

[0104] like Figure 21 As shown, the circular bottom surface of the other end of the swing arm A7-3 is connected to a rotating mechanism B7-4 whose axis is parallel to the Z-axis. The rotating mechanism B7-4 includes a rotating shaft B7-4-1 whose axis is parallel to the Z-axis. The upper surface of the flange of the rotating shaft B7-4-1 is connected to the circular bottom surface of the other end of the swing arm A7-3. The rotating shaft section B7-4-1B is movably connected to two bearings B7-4-2 with a certain distance between them. The two bearings B7-4-2 are embedded from below into the countersunk holes of the bearing mounting seat B7-4-3, which is machined with countersunk holes and through holes. The bottom surface of the mounting seat B7-4-3 is connected to an annular pressure plate B7-4-4, which presses down on the two bearings B7-4-2. The bottom surface of the annular pressure plate B7-4-4 is connected to a motor B7-4-5, which is movably connected to the rotating shaft B7-4-1. Motor B7-4-5 can drive the rotating shaft B7-4-1 to rotate, which in turn drives the swing arm A7-3 to rotate.

[0105] The bearing mounting base B7-4-3 has an arc surface on one side and a straight surface parallel to the Z-axis on the other side. The straight surface is connected to the straight surface of one end of a swing arm B7-5, whose upper and lower surfaces are parallel to the XY plane and are parallel to the Z-axis.

[0106] like Figure 22As shown, the circular bottom surface of the other end of the swing arm B7-5 is connected to a rotating mechanism C7-6 whose centerline is parallel to the Z-axis. The rotating mechanism C7-6 includes a circular plate A7-6-1. The upper surface of circular plate A7-6-1 is connected to the circular bottom surface of the other end of the swing arm B7-5. The lower surface of circular plate A7-6-1 is connected to the inner ring of a rotary shaft 7-6-2 whose centerline is parallel to the Z-axis. The outer ring of rotary shaft 7-6-2 is connected to a circular plate B7-6-3. The upper surface of circular plate B7-6-3 is connected to a motor C7-7-4. Motor C7-7-4 is placed within the inner ring of rotary shaft 7-6-2 and is movably connected to circular plate A7-6-1. Motor C7-7-4 can drive circular plate A7-6-1 to rotate, thereby rotating the swing arm B7-5.

[0107] like Figure 23 As shown, the lower surface of the circular plate B7-6-3 is connected to the Z-axis lifting mechanism B7-7. The lifting mechanism B7-7 includes a square column 7-7-1 with four sidewalls parallel to the Z-axis. The upper surface of the square column 7-7-1 is connected to the lower surface of the circular plate B7-6-3. The four sidewalls of the square column 7-7-1 are each connected to a linear guide rail B7-7-2 in the Z-axis direction. The four linear guide rails B7-7-2 are respectively connected to four sets of two sliders B7-7-3 in each set. Each group has two sliders B7-7-3 connected to the outer walls of the four triangular supports 7-7-4 facing the square column 7-7-1. The inner wall of one of the four triangular supports 7-7-4 is connected to a linear drive mechanism 7-7-5 in the Z-axis direction. The linear drive mechanism 7-7-5 is movably connected to one side wall of the square column 7-7-1. The linear drive mechanism 7-7-5 can drive the square column 7-7-1 to rise and fall, thereby driving the rotating mechanism C7-6 to rise and fall.

[0108] The bottom surfaces of the four triangular supports 7-7-4 are connected to the upper surface of the treatment bed base 7-8. The combined action of the rotating mechanism A(-2), rotating mechanism B7-4, rotating mechanism C7-6, and lifting mechanism B7-7, and through the swing arms A7-3 and B7-5, allows the bed board 7-1-1 to rotate, swing, and rise and fall.

[0109] In this embodiment, the treatment bed 7 is used to mount the frame 6 of the circular image-guided positioning system. For example... Figure 24 The treatment bed 7 delivers the bed board 7-1-1 into the treatment area from the left side. Under the guidance of the image-guided positioning system, the bed board 7-1-1 can make the target center of the tumor in the patient's body coincide with the isocenter 101.

[0110] like Figure 25 The treatment bed 7 delivers the bed board 7-1-1 from the left side into the treatment area.

[0111] like Figure 24and Figure 25 As shown, by combining the trapezoidal beam delivery system mounting frame 5 with the ring image guidance system mounting frame 6 swinging around the X-axis, 360° coplanar irradiation around the tumor can be achieved.

[0112] like Figure 26 As shown, non-coplanar irradiation can be achieved by adjusting the angle of the long side of the treatment bed board 7-1-1 relative to the X-axis. Lowering the height of the treatment bed board 7-1-1 to approximately 70cm above the floor facilitates patient access to and from the treatment bed; raising the height of the treatment bed board 7-1-1 to approximately 130cm above the floor facilitates patient positioning by medical staff. The raising and lowering of the treatment bed board 7-1-1 is also a component of image-guided positioning.

Claims

1. A proton accelerator therapy system, comprising: Support, beam guiding system, beam distribution system, beam guiding positioning system Its characterized in that: the support includes two front-end processing semicircular opening rectangular vertical plate (2) arranged oppositely; The beam guiding system (3) is clamped in the middle of the two rectangular vertical plate (2), including two-stage magnet A (3-1), two-stage magnet B (3-2), deflection magnet (3-4) in turn through the beam; The magnetic yoke A (3-1-2) of the two-stage magnet A (3-1) is fixedly clamped between the two rectangular vertical plate (2), and the two magnetic poles A (3-1-1) are vertical rectangular magnetic poles in the beam propagation direction; The two-stage magnet B (3-2) can slide up and down in the vertical direction, including two magnetic poles B (3-2-1), and the magnetic pole B (3-2-1) is a vertical rectangular magnetic pole in the beam propagation direction; The deflection magnet (3-4) includes a pair of upper and lower deflection magnets (3-4) with symmetrical structure, and the upper and lower deflection magnets (3-4) are mirror symmetric with respect to the horizontal plane of the beam propagation direction, and the two deflection magnetic poles (3-4-1) of the upper and lower deflection magnets (3-4) are parallel to the vertical plane of the beam propagation direction, and the side wall of the deflection yoke (3-4-2) of the upper and lower deflection magnets (3-4) is connected with the inner surface of the two rectangular vertical plate (2) respectively, and the linear mechanism A (3-3) drives the two-stage magnet B (3-2) to slide up and down in the vertical direction, and the linear mechanism A (3-3) includes two vertical rectangular vertical plate (3-3-1), and the magnetic yoke B (3-2-2) of the two-stage magnet B (3-2) is clamped between the two vertical rectangular vertical plate (3-3-1); Each is slidably connected with the vertical linear guide rail A (3-3-3) arranged on the inner surface of the rectangular vertical plate (2) through the sliding block A (3-3-2), and further includes a linear driving mechanism A (3-3-4) for driving the sliding block A (3-3-2) to slide on the linear guide rail A (3-3-3), and the linear driving mechanism A (3-3-4) is a screw nut type structure, The beam distribution system has a trapezoidal frame (5) in it, and the trapezoidal frame (5) is hung in a swing mechanism (4); The swing mechanism (4) comprises a pair of annular guide rail seats (4-1) respectively embedded in the semicircular openings of the two rectangular vertical plates (2), arc-shaped guide rails (4-2) installed in the annular guide rail seats (4-1), and distribution sliders (4-3) arranged on the two arc-shaped guide rails (4-2); the distribution sliders (4-3) are respectively connected with the outer surfaces of the two arms of the U-shaped structure at the upper end of the trapezoidal frame (5), so that the trapezoidal frame (5) arranged in the beam distribution system swings in the arc-shaped guide rails (4-2); the inner arc surfaces of the annular guide rail seats (4-1) are processed with arc-shaped racks, the two arc-shaped racks are respectively movably connected with a distribution gear (4-4), the distribution gear (4-4) is movably connected with a rotating mechanism (4-5) installed at the middle part of the lower surface of the U-shaped structure horizontal plate at the upper end of the trapezoidal frame (5); the rotating mechanism (4-5) is movably connected with a pulley type linkage mechanism (4-6) installed at the rear end of the lower surface of the U-shaped structure horizontal plate; the support frame comprises a treatment bed (7), the treatment bed (7) comprises a bed surface (7-1), a rotating mechanism A (7-2), a swing arm A (7-3), a rotating mechanism B (7-4), a swing arm B (7-5), a rotating mechanism C (7-6), a lifting mechanism B (7-7), and a base (7-8); The base (7-8) is fixedly installed on a horizontal plane; the lifting mechanism B (7-7) is arranged on the base (7-8) and is provided with a rotating mechanism C (7-6) at the top end, and the axis line of the rotating mechanism C (7-6) is perpendicular to the horizontal plane; The rotating end of the rotating mechanism C (7-6) is connected with the swing arm B (7-5), the end of the swing arm B (7-5) is provided with the rotating mechanism B (7-4), and the axis line of the rotating mechanism B (7-4) is perpendicular to the horizontal plane; The rotating end of the rotating mechanism B (7-4) is connected with the swing arm A (7-3); the end of the swing arm A (7-3) is provided with the rotating mechanism A (7-2), and the axis line of the rotating mechanism A (7-2) is perpendicular to the horizontal plane; The bed surface (7-1) is installed at the rotating end of the rotating mechanism A (7-2), and the bed surface (7-1) comprises a bed plate (7-1-1); the upper surface of the bed plate (7-1-1) is embedded with a rectangular plate A (7-1-2) at about one third of the long side, the upper surface of the rectangular plate A (7-1-2) is flush with the upper surface of the bed plate (7-1-1), and the lower surface of the bed plate (7-1-1) is connected with a rectangular plate B (7-1-3).

2. The proton accelerator therapy system of claim 1, wherein: The rotating mechanism A (7-2) comprises a rotating shaft A (7-2-1) with a flange at the top and perpendicular to the horizontal plane; The upper surface of the flange of the rotating shaft A (7-2-1) is connected with the bed surface (7-1); Two bearings A (7-2-2) are arranged on the rotating shaft A (7-2-1) at intervals; A motor A (7-2-5) drives the rotating shaft A (7-2-1) to rotate; The end of the swing arm A (7-3) is provided with a circular through hole to form a mounting seat A (7-2-3) for mounting a rotating shaft A (7-2-1), the outer circle of a bearing A (7-2-2) on the rotating shaft A (7-2-1) is fixed with the mounting seat A (7-2-3), a motor A (7-2-5) is fixedly installed in the circular through hole of the swing arm A (7-3) through a ring-shaped pressing plate (7-2-4), and the shaft of the motor A (7-2-5) is connected with the rotating shaft A (7-2-1).

3. The proton accelerator therapy system of claim 1, wherein: The rotating mechanism C (7-6) comprises a circular plate A (7-6-1), the upper surface of the circular plate A (7-6-1) is connected with the circular bottom surface of the end of the swing arm B (7-5), the lower surface of the circular plate A (7-6-1) is connected with the inner ring of a gyration shaft (7-6-2) whose axis is perpendicular to the horizontal plane, the outer ring of the gyration shaft (7-6-2) is connected with a circular plate B (7-6-3), the upper surface of the circular plate B (7-6-3) is connected with a motor C (7-7-4), and the motor C (7-7-4) is arranged in the inner ring of the gyration shaft (7-6-2) and movably connected with the circular plate A (7-6-1).

4. The proton accelerator therapy system of claim 3, wherein: The ascending mechanism B (7-7) comprises a vertical quadrangular column (7-7-1), the upper surface of the quadrangular column (7-7-1) is connected with the surface of the circular plate B (7-6-3) of the rotating mechanism C (7-6) through the circular plate B (7-6-3), and the rotating mechanism C (7-6) is supported; four side walls of the quadrangular column (7-7-1) are connected with vertical linear guide rails B (7-7-2) respectively, the four linear guide rails B (7-7-2) are connected with four groups of two sliders B (7-7-3) respectively, the four groups of two sliders B (7-7-3) are connected with the outer side walls of the vertical walls of four triangular supports (7-7-4) respectively, the inner side wall of the vertical wall of one of the four triangular supports (7-7-4) is connected with a vertical linear driving mechanism (7-7-5), the linear driving mechanism (7-7-5) is movably connected with one side wall of the quadrangular column (7-7-1), and the linear driving mechanism (7-7-5) can drive the quadrangular column (7-7-1) to ascend and descend, and drive the rotating mechanism C (7-6) to ascend and descend.

Images