A particle therapy system enabling spherically uniform irradiation

Abstract

The present application provides a kind of particle therapy system that can realize spherical illumination, including beam guiding system and bidirectional scanning radiation head;The beam guiding system introduces particle beam to bidirectional scanning radiation head and shoots at treatment center;It also includes treatment chair system, the treatment chair system includes treatment chair;In order to make patient sit on treatment chair, corresponding treatment site coincides with treatment center, it also includes a horizontal slide plate supporting the treatment chair, horizontal sliding device that drives treatment chair to slide freely on horizontal slide plate, up-down moving mechanism that drives horizontal slide plate to move up and down, and around-axis rotating mechanism that drives horizontal slide plate to rotate around the front of treatment chair.In the present application, treatment chair system that can move horizontally, rotate, move up and down and rotate around axis is adopted, forming spherical illumination.Compared with horizontal illumination, although some equipment costs are increased, compared with rotating gantry, the structure is greatly simplified, the volume is significantly reduced, and the manufacturing cost is also greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of particle therapy systems capable of spherical irradiation. Background Technology

[0002] Current particle radiotherapy generally employs three methods: horizontal irradiation (introducing the beam horizontally into the treatment room), vertical irradiation (introducing the beam vertically into the treatment room), and rotary irradiation (introducing the beam into a rotating gantry). Rotary gantry irradiation is the most advanced method. In rotary gantry irradiation, the patient typically lies supine on the treatment bed. The rotating gantry drives the radiation head to rotate around the patient, irradiating from multiple angles. When the plane of the rotation trajectory of the point source in the radiation head is perpendicular to the long side of the treatment bed, or in other words, the plane is perpendicular to the longitudinal direction of the body, it is called coplanar irradiation. When the plane of the rotation trajectory of the point source has an angle with the long side of the treatment bed, it is called non-coplanar irradiation. Non-coplanar irradiation is particularly important for the treatment of head tumors, as it allows the radiation to effectively avoid sensitive organs. However, rotary gantry systems are very expensive and difficult to widely implement. In response, many medical scientists have explored the use of horizontal beams to achieve both coplanar and non-coplanar irradiation. Coplanar irradiation is achieved by having the patient sit in a treatment chair and rotating the chair, which is equivalent to a point light source rotating around the patient, thus achieving coplanar irradiation. Non-coplanar irradiation requires the patient to tilt, which is difficult to achieve because organs within the body will undergo relative positional changes due to gravity, thus compromising irradiation accuracy. When using a rotating gantry with a treatment bed, the patient's posture relative to the treatment bed remains unchanged, which is one of the characteristics and advantages of rotating gantry irradiation. If the patient's posture can be kept constant when using a rotating chair irradiation method, the accuracy of the irradiation can be improved. Summary of the Invention

[0003] This invention provides a particle therapy system capable of spherical irradiation, which does not require the patient to change posture when performing non-coplanar irradiation. In this particle therapy system capable of spherical irradiation, the patient's posture remains unchanged when using a rotating seat irradiation method.

[0004] The technical solution adopted by the present invention to achieve its technical objective is: a particle therapy system capable of spherical irradiation, including a beam guiding system and a bidirectional scanning radiation head; the beam guiding system guides the particle beam into the bidirectional scanning radiation head and directs it toward the treatment center; it also includes a treatment chair system, the treatment chair system including a treatment chair; in order to enable the patient to sit on the treatment chair with the corresponding treatment area coinciding with the treatment center, it also includes a horizontal sliding plate supporting the treatment chair, a horizontal sliding device that drives the treatment chair to slide freely on the horizontal sliding plate, a vertical moving mechanism that drives the horizontal sliding plate to move up and down, and a rotation mechanism that drives the horizontal sliding plate to rotate around an axis around the front of the treatment chair.

[0005] Furthermore, in the aforementioned particle therapy system capable of spherical irradiation: the horizontal sliding device is a magnetic sliding device, including a passive magnetic sliding plate disposed on the upper side of the horizontal sliding plate to support the treatment chair, and an active magnetic sliding plate disposed below the horizontal sliding plate; the active magnetic sliding plate is disposed in a hollow frame supporting the horizontal sliding plate, and a power mechanism for driving the active magnetic sliding plate to slide below the horizontal sliding plate is disposed in the hollow frame.

[0006] Furthermore, the aforementioned particle therapy system capable of spherical irradiation also includes a self-rotating mechanism; the self-rotating mechanism includes a gyroscopic support shaft A disposed under the hollow frame, the gyroscopic support shaft A driving the hollow frame to rotate around the gyroscopic axis of the gyroscopic support shaft A.

[0007] Furthermore, in the aforementioned particle therapy system capable of spherical irradiation: the up-and-down movement mechanism includes a vertical support set in front of the hollow frame, a pair of vertical guide rails set on the vertical support, and an up-and-down movement drive mechanism that drives the up-and-down movement slider set on the hollow frame to slide up and down on the vertical guide rails.

[0008] Furthermore, in the aforementioned particle therapy system capable of spherical irradiation: the axial rotation mechanism includes a rotary support shaft B connected to the circular base of the vertical support; the rotary support shaft B is mounted on a base B; the outer ring of the rotary support shaft B is connected to the lower surface of the circular base of the vertical support, the inner ring of the rotary support shaft B is connected to the upper surface of the base B, and the upper surface of the base B is connected to a disc motor B.

[0009] Furthermore, in the aforementioned particle therapy system capable of spherical irradiation: the beam guiding system includes a deflecting magnet A and a deflecting magnet B; the deflecting magnet A is disposed on a base A, and on the base A, a pair of arc-shaped mounting plates facing the treatment center are disposed on both sides of the deflecting magnet A, with the deflecting magnet B clamped at the end of the mounting plates, forming a vacuum channel between the mounting plates for the beam to travel from the deflecting magnet A to the deflecting magnet B.

[0010] Furthermore, in the aforementioned particle therapy system capable of spherical irradiation: the bidirectional scanning radiation head includes a bidirectional guiding magnet and a focusing coil; the bidirectional guiding magnet's axis passes through the inner and outer walls of the treatment center, forming an annular yoke that curves outward from top to bottom; two sets of coils are wound along the inner and outer walls of the annular yoke; and an annular beam channel of equal thickness, curving outward from bottom to top, passes through the inner and outer walls and forms an annular beam channel. Flange discs are positioned at the upper and lower ends of the annular yoke, and cooling boxes are positioned outside the two sets of coils. The axis of the focusing coil coincides with the axis of the annular yoke, and its bottom surface is connected to the upper surface of the upper flange disc. A junction box mounted on two clamping plates connects the power and signal lines of the swingable bidirectional guiding magnet and focusing coil to an external power source and monitoring device.

[0011] Furthermore, the aforementioned particle therapy system capable of spherical irradiation also includes a radiator oscillation mechanism for bidirectional scanning radiator oscillation; the radiator oscillation mechanism includes a horizontal plate spanning between the mounting plates and an annular guide rail disposed outside the pair of mounting plates; a circular hole is provided in the center of the horizontal plate through which a focusing coil can pass; the bidirectional scanning radiator utilizes the focusing coil passing through the circular hole on the horizontal plate; the front end of the mounting plate has an arc-shaped notch centered on the treatment center, and the annular guide rail is disposed inside the arc-shaped notch of the mounting plate; both ends of the horizontal plate form sliding mechanisms connected to the annular guide rail.

[0012] Furthermore, the aforementioned particle therapy system capable of spherical irradiation also includes a CT positioning system; the CT positioning system includes a horizontally placed CT scanner, the CT scanner having two opposite sides that are arc-shaped and the other two opposite sides that are right-angled; the CT scanner is mounted on a base C using two columns.

[0013] Furthermore, the aforementioned particle therapy system capable of spherical irradiation also includes a dual X-ray machine repositioning system. This system comprises two X-ray emitters and two flat panel detectors, positioned on opposite sides of a vertical plane at the treatment center, mirror-symmetrically. The X-ray emitter on one side of the vertical plane and the flat panel detector on the other side form an X-ray machine. The detection beam emitted by the X-ray emitter on one side of the vertical plane irradiates the surface of the flat panel detector on the other side, with the axis of the detection beam perpendicular to the detection surface of the flat panel detector and passing through the geometric center of the detector surface. The axes of the two detection beams coincide with the horizontal plane containing the beams and are perpendicular to the treatment center. The two X-ray emitters are each installed in a housing, and the backs of the two flat panel detectors are each connected to a column.

[0014] In this invention, a treatment chair system that can move horizontally, rotate, move up and down, and rotate around an axis is used to form spherical irradiation. Compared with horizontal irradiation, although it increases some equipment costs, the structure is greatly simplified and the volume is significantly reduced compared with a rotating gantry, and the manufacturing cost is also greatly reduced.

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 Overall diagram of the treatment system;

[0017] Figure 2 1. Overall diagram of the beam guidance system;

[0018] Figure 3 One of the structural diagrams of deflecting magnet A;

[0019] Figure 4 1. Structural diagram of deflecting magnet A (Part 2);

[0020] Figure 5 The third structural diagram of deflecting magnet A;

[0021] Figure 6 One of the structural diagrams of deflecting magnet B;

[0022] Figure 7 The second structural diagram of deflecting magnet B;

[0023] Figure 8 The third structural diagram of deflecting magnet B;

[0024] Figure 9 1. Beam guidance system beam path diagram;

[0025] Figure 10 Schematic diagram of spherical illumination principle;

[0026] Figure 11 Radiator head general diagram;

[0027] Figure 12 One of the structural diagrams of a bidirectional guiding magnet;

[0028] Figure 13 1. Two-way guiding magnet structure diagram;

[0029] Figure 14 1. Working principle diagram of the bidirectional guiding magnet;

[0030] Figure 15 Part 3 of the bidirectional guiding magnet structure diagram;

[0031] Figure 16 Diagram 4 of the bidirectional guiding magnet structure;

[0032] Figure 17 Part 5 of the bidirectional guiding magnet structure diagram;

[0033] Figure 18 One of the structural diagrams of the radiating head swing mechanism;

[0034] Figure 19 1. Second structural diagram of the radiating head swing mechanism;

[0035] Figure 20 One of the structural diagrams of a treatment chair system;

[0036] Figure 21 The second structural diagram of the treatment chair system;

[0037] Figure 22 The third structural diagram of the treatment chair system;

[0038] Figure 23 The fourth structural diagram of the treatment chair system;

[0039] Figure 24 The fifth structural diagram of the treatment chair system;

[0040] Figure 25 Therapeutic chair system structural diagram, part six;

[0041] Figure 26 CT positioning system structure diagram;

[0042] Figure 27 Diagram showing the positional relationship between the treatment chair system and the CT positioning system;

[0043] Figure 28 1. Structure diagram of the repeatable positioning system;

[0044] Figure 29 One of the structural diagrams of the treatment room;

[0045] Figure 30 Treatment room structural diagram 2;

[0046] Figure 31 Treatment Room Structure Diagram 3

[0047] Figure 32 Treatment room structural diagram four;

[0048] Figure 33 One of the workflow diagrams for the treatment system;

[0049] Figure 34 The second part of the treatment system workflow diagram;

[0050] Figure 35 The third part of the treatment system workflow diagram;

[0051] Figure 36 The fourth part of the treatment system workflow diagram.

[0052] Attached symbols:

[0053] 1. Beam guidance system,

[0054] 1-1. Deflecting magnet A; 1-1-1. Magnetic pole A; 1-1-2. Excitation coil A; 1-1-3. U-shaped yoke A; 1-1-4. Cooling box A; 1-1-5. Beam channel A; 1-1-6. Vertical sealing strip; 1-1-7. Heat insulation plate A.

[0055] 1-2, Deflecting magnet B; 1-2-1, Magnetic pole B; 1-2-2, Winding post; 1-2-3, Excitation coil B; 1-2-4, U-shaped yoke B; 1-2-5, Cooling box B; 1-2-6, Beam channel B; 1-2-7, Annular sealing strip; 1-2-8, Heat insulation plate B;

[0056] 1-3. Vacuum channel; 1-4. Mounting clamp; 1-5. Base A;

[0057] 2. Two-way scanning radiator

[0058] 2-1. Bidirectional guiding magnet; 2-1-1. Annular yoke; 2-1-2. Coil; 2-1-2-1. X group coil; 2-1-2-2. Y group coil; 2-1-3. Annular beam channel; 2-1-4. Flange; 2-1-5. Cylindrical cooling box.

[0059] 2-2, Bundling coil; 2-3, Terminal block;

[0060] 3. Radial head swing mechanism

[0061] 3-1, Horizontal plate; 3-1-1, Vertical plate; 3-1-2, Vertical plate with an arc-shaped upper surface; 3-1-3, Arc-shaped plate;

[0062] 3-2. Circular guide rail slider; 3-3. Circular guide rail; 3-4. Belt; 3-5. Pulley; 3-6. Roller; 3-7. Counterweight;

[0063] 3-8, Z-direction linear mechanism ZA; 3-8-1, slider ZA; 3-8-2, guide rail ZA; 3-8-3, linear drive mechanism ZA; 3-8-4, pulley mechanism;

[0064] 4. Treatment chair system

[0065] 4-1. Treatment chair;

[0066] 4-2. Passive magnetic slide plate; 4-2-1. Pressure plate A; 4-2-2. Magnet and ejector pin bearing mounting base A; 4-2-3. Cylindrical magnet block A; 4-2-4. Cylindrical ejector pin bearing A;

[0067] 4-3. Skateboard;

[0068] 4-4. Active magnetic slide plate; 4-4-1. Pressure plate B; 4-4-2. Magnet and ejector pin bearing mounting base B; 4-4-3. Cylindrical magnet block B; 4-4-4. Cylindrical ejector pin bearing B.

[0069] 4-5. Horizontal linear mechanism X; 4-5-1. Slider X; 4-5-2. Horizontal linear guide X; 4-5-3. U-shaped guide seat X; 4-5-4. Horizontal linear drive mechanism X.

[0070] 4-6, Horizontal linear mechanism Y; 4-6-1, Slider Y; 4-6-2, Horizontal linear guide Y; 4-6-3, U-shaped guide seat Y; 4-6-4, Horizontal linear drive mechanism Y;

[0071] 4-7. Self-rotating mechanism; 4-7-1. Rotary support shaft A; 4-7-2. Shaft seat; 4-7-3. Disc-shaped motor A;

[0072] 4-8. Hollow frame; 4-9. Vertical up-and-down moving mechanism; 4-9-1. Slider YB; 4-9-2. Vertical linear guide YB; 4-9-3. Triangular bracket; 4-9-4. Vertical linear drive mechanism YB; 4-9-4-1. Nut.

[0073] 4-10. Rotation mechanism around the axis; 4-10-1. Rotary support shaft B; 4-10-2. Base B; 4-10-3. Disc motor B;

[0074] 5. CT positioning system

[0075] 5-1. CT scanner; 5-2. Column; 5-3. Base C; 5-4. Scanning ring;

[0076] 6. Dual X-ray machine repositioning system; 6-1. X-ray emitter; 6-1-1. Housing; 6-2. Flat panel detector; 6-2-1. Column;

[0077] 7. Treatment room; 7-1. Shielded room; 7-2. Corridor; 7-3. Shielded door; 7-4. L-shaped thickened shielding layer; 7-5. Square terminal beam transport section corridor; 7-6. Straight-through floor;

[0078] 101. Treatment Center;

[0079] 102. Guided beam;

[0080] 102-1. The beam that enters the deflecting magnet A;

[0081] 102-2. The beam deflected by deflecting magnet A;

[0082] 102-3. The beam emitted from deflecting magnet A;

[0083] 102-4. The beam deflected by deflecting magnet B;

[0084] 102-5. The beam emitted from deflecting magnet B;

[0085] 103. The spherical surface on which the light source moves;

[0086] 104. The patient;

[0087] 105. Rhomboid detection beam. Detailed Implementation

[0088] like Figure 1 As shown, this embodiment is a spherical irradiation rotating seat-type particle therapy system. It uses a rectangular coordinate system with the Z-axis as the vertical axis and the X and Y axes as the horizontal axes intersecting at the treatment center 101 as a reference. The XY plane is horizontal, the YZ plane is the plane directly facing the observer (referred to as the opposite plane), and the XZ plane is vertical. Figure 1 As shown, the treatment system includes a beam guiding system 1 that projects a beam injected along the Y-axis into the treatment center 101 from different angles after being deflected twice in the YZ plane above the XY plane; a bidirectional scanning radiation head whose axis coincides with the YZ plane and is positioned relative to the treatment center 101; a radiation head swinging mechanism with the X-axis as its axis; a treatment chair system that can move horizontally and vertically, rotate with the Z-axis as its axis, and swing with a vertical axis coinciding with the YZ plane, and can change position in both positioning and treatment states; a CT positioning system with the axis of a CT scanner's scanning cylinder perpendicular to and coinciding with the YZ plane; a dual X-ray machine repositioning system with two probe beam axes whose axes coincide with the XY plane and intersect perpendicularly with the treatment center 101; and a treatment room with thickened shielding walls that functions as both a positioning room and a treatment room.

[0089] like Figure 1 and Figure 2 As shown, the beam guiding system 1 includes a deflecting magnet A1-1, a deflecting magnet B1-2, a vacuum channel 1-3, two mounting plates 1-4 with their inner and outer surfaces, one end of which is machined into an arc shape and parallel to the YZ plane and mirror-symmetrical with respect to the YZ plane, and a base A1-5 with its upper and lower surfaces parallel to the XY plane. The deflecting magnets A1-1 and B1-2 have the same structure.

[0090] like Figure 2 , Figure 3 and Figure 9As shown, the deflecting magnet A1-1 includes two magnetic poles A1-1-1 with quasi-triangular pole faces. The beam injection end is narrower and the beam output end is wider. The upper end is a slope and the lower end is a plane. The two opposing magnetic pole faces are parallel to the YZ plane with a certain gap and are mirror symmetrical with respect to the YZ plane. The two magnetic poles A1-1-1 have a certain thickness along the X direction. An excitation coil A1-1-2 is wound around the outer edge of the quasi-triangle. The width of the excitation coil A1-1-2 is less than the thickness of the magnetic pole A1-1-1. The outer surfaces of the two magnetic poles A1-1-1 parallel to the YZ plane are connected to the inner surfaces of the two arms of a U-shaped magnetic yoke A1-1-3.

[0091] Figure 3 In order to see the magnetic pole A1-1-1, an excitation coil A1-1-2 was moved upward by a distance.

[0092] like Figure 4 As shown, the magnetic yoke A1-1-3, along with the two magnetic poles A1-1-1 and the two excitation coils A1-1-2, is placed in a cooling box 1-1-4. The two outer surfaces of the magnetic yoke A1-1-3, parallel to the YZ plane, are connected to the two inner sidewalls of the cooling box A1-1-4, also parallel to the YZ plane. A beam channel A1-1-5, running through the Y direction and mirror-symmetrical to the YZ plane, is installed in the middle of the cooling box A1-1-4 in the X direction. The beam injection end of the beam channel A1-1-5 is sealed with a vertical sealing strip 1-1-6, which has a circular hole centered on the Y-axis. The beam output end of the beam channel A1-1-5 is connected to the end of the vacuum channel 1-3 furthest from the treatment center 101.

[0093] Figure 4 In order to see the internal structure clearly, the cooling box A1-1-4 was copied and moved down a distance. The original cooling box A1-1-4 was cross-sectionalized, and the vacuum channel 1-3 was also partially cross-sectionalized.

[0094] The circular hole machined on the upright sealing strip 1-1-6 is connected to the vacuum channel of the injected beam.

[0095] like Figure 5 As shown, the two outer sides of the cooling box A1-1-4, which are parallel to the YZ plane, are respectively connected to a heat insulation plate A1-1-7, and the outer sides of the two heat insulation plates A1-1-7, which are parallel to the YZ plane, are respectively connected to the inner sides of the two clamping plates 1-4.

[0096] like Figure 2 , Figure 6 and Figure 9As shown, the specific structure of the deflecting magnet B1-2 is identical to that of the previously described deflecting magnet A1-1. It includes two magnetic poles B1-2-1 with irregularly shaped magnetic pole surfaces. The injection end of its beam is a curve connecting two straight lines. Its upper end and the end facing the treatment center 101 are arc-shaped. The two opposing magnetic pole surfaces are parallel to the YZ plane with a certain gap and are mirror-symmetrical with respect to the YZ plane. The outer surfaces of the two magnetic poles B1-2-1 parallel to the YZ plane are respectively connected to a set of winding posts 1-2-2. Two sets of excitation coils B1-2-3 are respectively wound on the two sets of winding posts 1-2-2. The width of the excitation coils B1-2-3 is equal to the thickness of the winding posts 1-2-2. The outer surfaces of the two sets of winding posts 1-2-2 parallel to the YZ plane are respectively connected to the inner surfaces of the two arms of a U-shaped magnetic yoke B1-2-4.

[0097] Figure 6 In order to see the internal structure clearly, a U-shaped magnetic yoke B1-2-4 was copied and moved back a distance. The original U-shaped magnetic yoke B1-2-4 was cross-sectionalized. At the same time, a set of winding posts 1-2-2 and a set of excitation coils B1-2-3 on the left side were moved to the left a distance.

[0098] like Figure 7 As shown, the U-shaped magnetic yoke B1-2-4, together with two magnetic poles B1-2-1, two sets of winding posts 1-2-2, and two sets of excitation coils B1-1-3, is placed in a cooling box B1-2-5. The outer side of the U-shaped magnetic yoke 1-2-4, which is parallel to the YZ plane, is connected to the two inner sidewalls of the cooling box B1-2-5, which are parallel to the YZ plane. A beam channel B1-2-6, which runs through the Y direction and is mirror-symmetrical with respect to the YZ plane, is installed in the middle of the cooling box B1-2-5 in the X direction. The beam injection end of the beam channel B1-2-6 is connected to the end of the vacuum channel 1-3 near the treatment center 101. The beam output end of the beam channel B1-2-6 is sealed with an annular sealing strip 1-2-7.

[0099] Figure 7 In order to see the internal structure clearly, the U-shaped magnetic yoke B1-2-4 was copied and moved forward a distance. The original U-shaped magnetic yoke B1-2-4 was cross-sectionalized. At the same time, the cooling box B1-2-5 was copied and moved upward a distance. The original cooling box B1-2-5 was cross-sectionalized.

[0100] like Figure 8 As shown, the two outer sides of the cooling box B1-2-5, which are parallel to the YZ plane, are connected to a heat insulation plate B1-2-8, and the outer sides of the two heat insulation plates B1-2-8, which are parallel to the YZ plane, are connected to the inner sides of the two clamping plates 1-4, and the bottom surfaces of the two clamping plates 1-4 are connected to the upper surface of the base A1-5.

[0101] The beam guidance process of beam guidance system 1 is as follows: Figure 9 As shown:

[0102] like Figure 9 As shown, the beam 102 guided by the beam guidance system 1 is divided into five segments, namely:

[0103] 102-1, the beam that enters the deflecting magnet A;

[0104] 102-2, The beam deflected by deflecting magnet A;

[0105] 102-3, the beam emitted from deflecting magnet A;

[0106] 102-4, the beam deflected by deflecting magnet B;

[0107] 102-5, the beam emitted from deflecting magnet B;

[0108] The axis of the deflected beam 102 coincides with the YZ plane.

[0109] The beam 102-5 emitted from the deflecting magnet B is projected radially toward the treatment center 101.

[0110] The angle between the beam 102-5 emitted from the deflecting magnet B and the Y-axis can vary between 0° and 60°. When the angle is 0°, it is coplanar illumination, and when the angle is greater than 0° and less than or equal to 60°, it is spherical illumination.

[0111] like Figure 9 and Figure 10 As shown, assuming that the intersection of the beam 102-5 emitted from the deflecting magnet B and the inner arc-shaped end face of the magnetic pole B is the location of the virtual point light source, as the angle between the beam 102-5 and the Y-axis changes and the human body 104 rotates around the Z-axis, from the perspective of the human body 10, the virtual point light source moves on a spherical surface 103 with an open top, which is the spherical illumination defined in this patent.

[0112] Figure 10 In order to see the human body 104, a corner of the sphere 103 was cut off.

[0113] like Figure 4 The cooling box A1-1-4 shown is Figure 7 The cooling box B1-2-5 shown is filled with a recirculating cryogenic liquid, which enables the excitation coils A1-1-2 and B1-2-3 to become superconducting. This significantly increases the magnetic field strength between magnetic poles A1-1-1 and B1-2-1, thereby reducing the beam deflection radius of the two magnetic poles and ultimately reducing the volume of the magnetic poles, excitation coils, and yoke.

[0114] In this embodiment, no specific limitations are made on the type of cryogenic liquid or the method of liquid injection and circulation.

[0115] The principle of this invention also applies to non-superconducting deflecting magnets. When using non-superconducting deflecting magnets, the magnets will be larger in size.

[0116] The principle of this invention does not limit the type of radiotherapy particles; they can be either lighter protons or heavier heavy ions.

[0117] like Figure 11 As shown, the dual-radiation head 2 includes a bidirectional guide magnet 2-1 with a cooling mechanism, a focusing coil 2-2, and two terminal blocks 2-3.

[0118] like Figure 12 As shown, the bidirectional guiding magnet 2-1 includes an annular iron yoke 2-1-1 with inner and outer walls of equal thickness that flare outward along an arc from top to bottom. Its axis coincides with the YZ plane and passes through the treatment center 101.

[0119] Figure 12 In order to see the inner and outer walls of the annular iron yoke 2-1-1, a corner of the annular iron yoke 2-1-1 was cut off.

[0120] like Figure 13 As shown, two sets of coils 2-1-2 are wound along the inner and outer walls of the annular yoke 2-1-1.

[0121] like Figure 14 As shown, the two sets of coils 2-1-2 are divided into group X coil 2-1-2-1 and group Y coil 2-1-2-2. Each group of coils contains two opposing coils, each coil consisting of multiple turns of wire connected in series. The opposing coils are connected in series, and the two groups of coils are wound crosswise around the yoke. To distinguish them, group X coil 2-1-2-1 is represented by a circle with an inscribed triangle, and group Y coil 2-1-2-2 is represented by a circle with an inscribed quadrilateral. When current is applied to group X coil 2-1-2-1 and group Y coil 2-1-2-2, they generate mutually perpendicular magnetic fields Bx and By. When a beam is directed from above, perpendicular to the plane of the paper and aimed at the geometric center of the two groups of coils, it will be deflected. Because the yoke 2-1 and the two groups of coils 2-1-2 adopt an outward-flaring design, the internal space above the yoke 2-1 is smaller, resulting in a stronger magnetic field. As the yoke 2-1 flares downward along the arc, the internal space gradually increases, and the magnetic field gradually weakens.

[0122] like Figure 15 As shown, an annular beam channel 2-1-3 with an inner and outer wall of uniform thickness, flaring outward along an arc from top to bottom, passes through an annular iron yoke 2-1-1 from bottom to top, and the axis of the annular beam channel 2-1-3 coincides with the axis of the annular iron yoke 2-1-1. The upper and lower ends of the annular beam channel 2-1-3 are respectively connected to a disk 2-1-4 with a central hole whose axis coincides with the axis of the annular beam channel 2-1-3.

[0123] Figure 15 In the design, the annular yoke 2-1-1, the annular beam channel 2-1-3, and the upper and lower disks 2-1-4 have all undergone local cross-sectional treatment.

[0124] like Figure 16 As shown, the lower surface of the upper disk 2-1-4 and the upper surface of the lower disk 2-1-4 are connected to the upper and lower ends of the coil 2-1-2, and together they support the annular yoke 2-1-1 and the coil 2-1-2.

[0125] like Figure 17 As shown, the upper and lower disks 2-1-4 are respectively embedded in the upper and lower surfaces of a hollow cylindrical cooling box 2-1-5, whose axis coincides with the axis of the annular iron yoke 2-1-1. The function of the cooling box 2-1-5 is to remove the heat generated by the coil 2-1-2 through circulating water, so as to increase the current of the coil 2-1-2, thereby increasing the ability of the bidirectional guide magnet 2-1 to deflect the beam.

[0126] like Figure 17 As shown, the centerline of the focusing coil 2-2 coincides with the centerline of the annular yoke 2-1-1, and its bottom surface is connected to the upper surface of the upper disk 2-1-4. The function of the focusing coil 2-2 is to focus the beam once before it enters the bidirectional guide magnet 2-1, thereby improving the beam's emissivity.

[0127] Figure 17 In order to see the internal structure, a corner of the cooling box 2-1-5 was cut off.

[0128] like Figure 11 As shown, the terminal block 2-3 consists of several arc-shaped wiring slide rails, installed on the outside of the two clamps 1-4, with the center of the slide rails coinciding with the X-axis. The function of the terminal block 2-3 is to facilitate the connection of the power and signal lines of the swingable bidirectional guide magnet 2-1, the focusing coil 2-2, and the supporting equipment to the external power supply and monitoring device. The number of power and signal lines, the number of arc-shaped wiring slide rails, and the contact method between the terminal block 2-3 and the power and signal lines depend on the specific situation.

[0129] like Figure 18As shown, the radiator head swing mechanism 3 includes a horizontal plate 3-1 with two long sides parallel to the X-axis. Its upper and lower surfaces are perpendicular to the axis of the cylindrical cooling box 2-1-5, and its lower surface is connected to the upper surface of the cylindrical cooling box 2-1-5. A circular hole with its axis coinciding with the axis of the cylindrical cooling box 2-1-5 is opened at its geometric center, allowing the focusing coil 2-2 to pass through. Two vertical plates 3-1-1, mirror-symmetrical with respect to the YZ plane, are connected to its upper surfaces near both ends along the X-axis. The inner sidewalls of the vertical plates 3-1-1, parallel to the YZ plane, are connected to a set of two annular guide rail sliders 3-2. Each set of annular guide rail sliders 3-2 is movably connected to an annular guide rail 3-3. The two annular guide rails 3-3 are circular with the X-axis as their axis. The core is connected to the outer side of the two clamping plates 1-4 respectively. The two end faces of the horizontal plate 3-1 parallel to the YZ plane are respectively connected to a vertical plate 3-1-2 with an arc-shaped upper end face. The arc-shaped upper end faces of the two vertical plates 3-1-2 with arc-shaped upper end faces are respectively connected to an arc-shaped plate 3-1-3 with an upper and lower arc surface centered on the X axis. The lower arc surfaces of the two arc-shaped plates 3-1-3 are respectively connected to the inner surface of a belt 3-4. The inner surfaces of the two belts 3-4 are respectively movably connected to a set of pulleys 3-5. The two sets of pulleys 3-5 are respectively connected to the two clamping plates 1-4 from the outside. The outer surface of the arc-shaped section of the belt 3-4 is respectively movably connected to a set of rollers 3-6. The rollers 3-6 are respectively connected to the two clamping plates 1-4 from the outside.

[0130] like Figure 19 As shown, the outer surface of the vertical section of belt 3-4 is connected to a counterweight 3-7, and the two counterweights 3-7 are connected to a Z-direction linear mechanism ZA3-8. Each of the two sets of two sliders ZA3-8-1 is connected to the inner surface of a counterweight 3-7. The two sets of sliders ZA3-8-1 are movably connected to a vertical linear guide rail ZA3-8-2. Each of the two sets of two linear guide rails ZA3-8-2 is connected to the outer surface of two clamping plates 1-4. The two counterweights 3-7 are movably connected to a vertical linear drive mechanism ZA3-8-3. The two linear drive mechanisms ZA3-8-3 are connected to the outer side of the two clamping plates 1-4 and movably connected to a pulley mechanism 3-8-4. The pulley mechanism 3-8-4 passes through the two clamping plates 1-4.

[0131] Figure 19 In the middle section, to clearly see the details of the Z-direction linear mechanism ZA3-8, the right-side clamping plate 1-4 has been moved down by a distance. The details of the linear drive mechanism ZA3-8-3 are omitted, and its space is represented by an upright cuboid; the details of the pulley mechanism 3-8-4 are omitted, and its space is represented by a horizontal cuboid.

[0132] The treatment chair system 4 includes a treatment chair 4-1; in order to enable the patient to sit on the treatment chair 4-1 with the corresponding treatment area coinciding with the treatment center, it also includes a horizontal sliding plate 4-3 that supports the treatment chair 4, a horizontal sliding device that allows the treatment chair 4-1 to slide freely on the horizontal sliding plate (4-3), an up-down moving mechanism that allows the horizontal sliding plate (4-3) to move up and down, and an axis rotating mechanism that allows the horizontal sliding plate (4-3) to rotate around the front of the treatment chair (4) around an axis.

[0133] The linear drive mechanism ZA3-8-3 is linked with another linear drive mechanism ZA3-8-3 through the pulley mechanism 3-8-4. It can simultaneously drive two counterweights 3-7 to move up and down. Through two belts 3-4, it drives the horizontal plate 3-1, along with the cooling box 2-1-5 and the focusing coil 2-2, to swing around the X-axis. The two counterweights 3-7, the horizontal plate 3-1, and the cooling box 2-1-5 and focusing coil 2-2 mounted on it achieve weight balance, which can significantly reduce the strength of the linear drive mechanism ZA3-8-3 and the power of the drive motor therein.

[0134] The horizontal sliding device is a magnetic sliding device, including a passive magnetic sliding plate 4-2 set on the upper side of the horizontal sliding plate 4-3 to support the treatment chair 4, and an active magnetic sliding plate 4-4 set below the horizontal sliding plate 4-3; the active magnetic sliding plate 4-4 is set in the hollow frame 4-8 supporting the horizontal sliding plate 4-3, and a power mechanism is set in the hollow frame 4-8 to drive the active magnetic sliding plate 4-4 to slide under the horizontal sliding plate 4-3.

[0135] It also includes a self-rotating mechanism 4-7; the self-rotating mechanism 4-7 includes a gyroscopic support shaft A4-7-1 disposed under the hollow frame 4-8, the gyroscopic support shaft A4-7-1 driving the hollow frame 4-8 to rotate around the gyroscopic axis of the gyroscopic support shaft A4-7-1.

[0136] The up-and-down moving mechanism 4-9 includes a vertical support 4-9-3 set in front of the hollow frame 4-8, a pair of vertical guide rails 4-9-2 set on the vertical support 4-9-3, and an up-and-down moving drive mechanism 4-9-4 that drives the up-and-down moving slider 4-9-1 set on the hollow frame 4-8 to slide up and down on the vertical guide rails 4-9-2.

[0137] The axial rotation mechanism 4-10 includes a rotary support shaft B4-10-1 connected to the circular base of the vertical support 4-9-3; the rotary support shaft B4-10-1 is mounted on a base B4-10-2; the outer ring of the rotary support shaft B4-10-1 is connected to the lower surface of the circular base of the vertical support 4-9-3, the inner ring of the rotary support shaft B4-10-1 is connected to the upper surface of the base B4-10-2, and the upper surface of the base B4-10-2 is connected to a disc motor B4-10-3.

[0138] The treatment chair system 4 includes a treatment chair 4-1 with a rectangular bottom surface parallel to the XY plane, connected to a rectangular passive magnetic slide 4-2. The passive magnetic slide 4-2 has two layers: the upper layer is a pressure plate A4-2-1, the upper surface of which is connected to the bottom surface of the chair 4-1, and the lower surface of which is connected to the upper surface of the magnet and pin bearing mounting base A4-2-2. The mounting base A4-2-2 has two sets of through holes with different diameters and a step, one set of which is embedded in... A cylindrical magnet block A4-2-3 with a stepped top and a tapered bottom is provided, with its upper and lower surfaces flush with the upper and lower surfaces of the mounting base A4-2-2. Another set of through holes is inserted into a cylindrical ejector bearing A4-2-4 with a stepped top and a tapered bottom, with its upper surface flush with the upper surface of the mounting base A4-2-2. The balls at the lower end of the ejector bearing A4-2-4 slightly extend beyond the lower surface of the mounting base A4-2-2.

[0139] Figure 20 In the diagram, the rectangular passive magnetic drag plate 4-2 is shown in an exploded view.

[0140] like Figure 21 As shown, the tops of a set of pin bearings A4-2-4 are all on a plane. They are movably connected to the upper surface of a slide plate 4-3, which has one end rounded and the other end straight. The upper and lower surfaces are parallel to the XY plane. The lower surface of the slide plate 4-3 is movably connected to a rectangular active magnetic slide plate 4-4. The active magnetic slide plate 4-4 has the same structure as the passive magnetic slide plate 4-2, but the opposite direction. From the vertical direction, the four sides of the two are aligned. The magnetic blocks A4-2-3 and B4-4-3, which are aligned vertically, have opposite polarities. The pin bearings B4-4-4 in the active magnetic slide plate 4-4 face upwards and are movably connected to the lower surface of the slide plate 4-3.

[0141] Figure 21 In the diagram, the rectangular active magnetic drag plate 4-4 is unfolded in the form of an exploded view.

[0142] like Figure 22As shown: In the active magnetic drag plate 4-4, the lower surface of the pressure plate B4-4-1 is movably connected to a horizontal linear mechanism X4-5. Two sets of two sliders X4-5-1 in each set are connected to the lower surface of the pressure plate B4-4-1. Each set of two sliders X4-5-1 is movably connected to a horizontal linear guide rail X4-5-2. The two horizontal linear guide rails X4-5-2 are connected to the upper ends of the two vertical arms of a U-shaped guide rail base X4-5-3. The upper surface of the U-shaped guide rail base X4-5-3 is connected to a horizontal linear drive mechanism X4-5-4. The linear drive mechanism X4-5-4 is movably connected to the pressure plate B4-4-1. The U-shaped guide rail... The seat X4-5-3 is movably connected to a horizontal linear mechanism Y4-6 perpendicular to the direction of the horizontal linear mechanism X4-5. Two sets of two sliders Y4-6-1 in each set are connected to the lower surface of the U-shaped guide rail seat X4-5-3. The two sets of sliders Y4-6-1 are movably connected to a horizontal linear guide Y4-6-2. The two horizontal linear guides Y4-6-2 are connected to the upper ends of the two vertical arms of the U-shaped guide rail seat Y4-6-3. The upper surface of the U-shaped guide rail seat Y4-6-3 is connected to a horizontal linear drive mechanism Y4-6-4. The linear drive mechanism Y4-6-4 is movably connected to the U-shaped guide rail seat X4-5-3.

[0143] Figure 22 In the diagram, the horizontal linear mechanism X4-5 and the horizontal linear mechanism Y4-6 are displayed in the form of an exploded view.

[0144] like Figure 23 As shown, the U-shaped guide rail Y4-6-3 is movably connected to a self-rotating mechanism 4-7. The outer ring of a vertically oriented rotary support shaft A4-7-1 is connected to the lower surface of the U-shaped guide rail Y4-6-3. The inner ring of the rotary support shaft A4-7-1 is connected to the upper surface of a bearing 4-7-2, which has one end arc-shaped and the other end straight. The upper and lower surfaces of the bearing 4-7-2 are parallel to the XY plane. The upper surface of the bearing 4-7-2 is connected to a disc-shaped motor A4-7-3. The motor A4-7-3 is movably connected to the U-shaped guide rail Y4-6-3.

[0145] Figure 23 In the diagram, the self-rotating mechanism 4-7 is shown in an exploded view.

[0146] like Figure 24As shown, viewed vertically, the bearing 4-7-2 and the slide plate 4-3 are vertically aligned, connected by a hollow frame 4-8. The hollow frame 4-8 is vertically aligned with both the bearing 4-7-2 and the slide plate 4-3. The end of the hollow frame 4-8 opposite the curved edge is connected to a vertically moving mechanism 4-9. Two sets of sliders YB4-9-1, each consisting of two blocks, are connected to the outer surface of the straight edge of the hollow frame 4-8 opposite the curved edge. The two sets of sliders YB4... -9-1 is movably connected to a vertical linear guide YB4-9-2. The two linear guides YB4-9-2 are connected to the outer surface of the rectangular plate of a triangular bracket 4-9-3. The inner surface of the rectangular plate of the triangular bracket 4-9-3 is connected to a vertical linear drive mechanism YB4-9-4. The nut 4-9-4-1 in the vertical linear drive mechanism YB4-9-4 passes through the rectangular plate of the triangular bracket 4-9-3 and is connected to the outer facade of the hollow frame 4-8.

[0147] Figure 24 In the middle, the vertical moving mechanisms 4-9 are shown in an exploded view.

[0148] like Figure 25 As shown, the circular base of the triangular bracket 4-9-3 is connected to a rotating mechanism 4-10. The outer ring of the vertically oriented rotary support shaft B4-10-1 is connected to the lower surface of the circular base of the triangular bracket 4-9-3, and the inner ring of the rotary support shaft B4-10-1 is connected to the upper surface of the base B4-10-2. The upper surface of the base B4-10-2 is connected to a disc motor B4-10-3, which is movably connected to the circular base of the triangular bracket 4-9-3. The axis of the rotary support shaft B4-10-1 coincides with the YZ plane.

[0149] Figure 25 In the diagram, the rotating mechanism 4-10 around the axis is shown in an exploded view.

[0150] like Figure 26 As shown, the CT positioning system 5 includes a horizontally placed CT scanner 5-1, whose scanning cylinder axis is vertical and coincides with the YZ plane. From the vertical direction, the CT scanner 5-1 has two opposite sides that are arc-shaped and two other opposite sides that are right-angled. Two of the vertical surfaces that are parallel to the YZ plane are connected to a hollow column 5-2 with an opening on one side. The lower surfaces of the bases of the two columns 5-2 are connected to the base C5-3.

[0151] like Figure 27 As shown, a circle is drawn with the axis of the rotary support shaft B4-10-1 as the center and the distance from the axis of the rotary support shaft B4-10-1 to the axis of the rotary support shaft A4-7-1 as the radius. This circle intersects both the Z-axis and the axis of the scanning cylinder of the CT machine 5-1.

[0152] like Figure 28 As shown, the repetitive positioning system 6 includes two X-ray emitters 6-1 and two flat panel detectors 6-2. The two X-ray emitters 6-1 and the two flat panel detectors 6-2 are located on both sides of the YZ plane and are mirror-symmetrical with respect to the YZ plane. The X-ray emitter 6-1 on one side of the YZ plane and the flat panel detector 6-2 on the other side of the YZ plane form an X-ray machine. The detection beam 105 emitted by the X-ray emitter 6-1 on one side of the YZ plane irradiates the surface of the flat panel detector 6-2 on the other side of the YZ plane, and the axis of the detection beam 105 is perpendicular to the detection surface of the flat panel detector 6-2 and passes through the geometric center of the detection surface of the flat panel detector 6-2. The axis of the two detection beams 105 coincides with the XY plane and is perpendicular to the treatment center 101. The two X-ray emitters 6-1 are respectively installed in a box 6-1-1, and the back of the two flat panel detectors 6-2 are respectively connected to a column 6-2-1.

[0153] Figure 28 In the middle, treatment center 101 is covered by detection beam 105, which is located at the intersection of the three coordinate axes.

[0154] like Figure 29 and 30 As shown, the main body of treatment room 7 is a rectangular shielded room 7-1 consisting of four shielded walls and upper and lower shielding layers. A patient and medical staff passage 7-2 is connected to the outside of shielded room 7-1 on the side parallel to the YZ plane. A shielded door 7-3 is installed at the entrance of passage 7-2. An L-shaped thickened shielding layer 7-4 is added to the front side of shielded room 7-1 parallel to the XZ plane and the bottom side parallel to the XY plane. A terminal beam transport section passage 7-5 is opened on the back side of shielded room 7-1 parallel to the XZ plane. A straight floor 7-6 is laid on the bottom surface inside shielded room 7-1. The relevant equipment of the treatment system is installed inside shielded room 7-1.

[0155] Figure 30 A cross-sectional view was created.

[0156] Figure 30 The treatment system's related equipment was packaged in outer packaging.

[0157] Figure 29 and Figure 30 In the middle, the added L-shaped thickened shielding layer 7-4 is to cover the area swept by the beam emitted by the bidirectional scanning radiation head 2, which can swing with the X-axis as the axis.

[0158] Figure 30 In the middle, the terminal beam transport section channel 7-5 is hollow, with openings at both ends in the Y direction. Here, the beam transport section where the beam enters the treatment room is called the terminal beam transport section.

[0159] like Figure 30 As shown, the bases of the two columns 6-2-1 of the support plate detector 6-2 in the repeat positioning system 6 are connected to the surface of the floor 7-6, and the upper surface of the slide plate 4-3 in the initial position in the treatment chair system 4 is flush with the surface of the floor 7-6.

[0160] like Figure 31 As shown, the lower surfaces of the base A1-5 in the beam guidance system 1, the base B4-10-2 in the treatment chair system 4, and the base C5-3 in the CT positioning system 5 are connected to the bottom surface of the shielding room 7-1.

[0161] like Figure 32 As shown, the two housings 6-1-1 in the repeat positioning system 6 that house the X-ray emitter 6-1 are connected to two walls in the shielded room 7-1 that are parallel to the YZ plane.

[0162] Figure 32 The treatment system's related equipment was packaged in outer packaging.

[0163] Workflow of a rotating seat-type particle therapy system capable of spherical irradiation:

[0164] 1. CT localization

[0165] 1) Placement

[0166] Medical staff will position the patient on treatment chair 4-1 and secure them in place to prevent changes in position during the positioning process. This process is called positioning.

[0167] 2) Treatment chair rise

[0168] like Figure 33 As shown, the drive chair is raised so that the lower surface of the bearing seat (4-7-2) under the chair 4-1 exceeds the surface of the floor 7-6.

[0169] 3) Therapy chair oscillation and rotation

[0170] like Figure 34 As shown, the treatment chair 4-1 swings 180° around the axis of the rotary support shaft B4-10-1, and at the same time, the treatment chair 4-1 rotates 180° around the axis of the rotary support shaft A4-7-1. At this time, the axis of the rotary support shaft A4-7-1 will coincide with the axis of the scanning cylinder of the CT machine 5-1, and the orientation of the treatment chair 4-1 will not change.

[0171] 4) Treatment chair elevation and CT scan

[0172] like Figure 35As shown, the treatment chair 4-1, along with the patient, is further driven to rise and pass through the scanning ring 5-4 of the CT scanner 5-1 at a certain speed. During this process, the CT scanner 5-1 performs layer-by-layer scanning of the patient's tumor area, with the inter-slice spacing depending on the required precision for creating the treatment plan. The scanning ring 5-4 refers to the annular exit portion of the rotating scanning beam of the CT scanner 5-1.

[0173] Figure 35 In order to see the scanning ring 5-4, the CT scanner 5-1 performed a cross-sectional processing.

[0174] 5) Treatment plan and generation of quasi-X-ray images

[0175] Medical staff use a set of CT scans to perform 3D reconstruction, obtaining images of the human body's external contours, bones, tumors, and surrounding organs. Based on this, they create a treatment plan, including determining the target area for tumor irradiation, the angle of incidence, the irradiation range, and the radiation dose. Simultaneously, two quasi-X-ray images at arbitrary perpendicular angles can be obtained for repeated localization.

[0176] 2. Dual X-ray machine repetitive positioning

[0177] Because creating a treatment plan takes a long time, general localization and relocalization are not performed simultaneously, but may be separated by several days.

[0178] 1) Repositioning

[0179] like Figure 36 As shown, in actual treatment, the patient must first be repositioned, and the repositioning process is the same as the initial repositioning process.

[0180] 2) Take real X-ray films

[0181] like Figure 36 As shown, two X-ray images of the patient's tumor site were taken using a dual X-ray machine repositioning system 6. Symbol 105 in the figure represents two diamond-shaped probe beams emitted from two X-ray generators.

[0182] 3) Image matching

[0183] By comparing two X-ray images taken by two X-ray machines with two quasi-X-ray images taken at the same angle obtained from the treatment plan, and ensuring that the two X-ray images and the two quasi-X-ray images are completely superimposed, the position correction parameters ΔX1, ΔY1, and ΔZ of the treatment chair 4-1 can be obtained. 1。

[0184] 4) Shift the tumor target to the treatment center

[0185] During treatment, the target of the tumor, as determined in the treatment plan, needs to be moved to the treatment center 101. This yields the second set of position correction parameters ΔX2, ΔY2, and ΔZ2 for the treatment chair 4-1. Based on these two sets of parameters, moving the treatment chair 4-1 along the X, Y, and Z directions will move the target of the tumor in the patient's body to the treatment center 101.

[0186] 3. Multi-angle illumination

[0187] 1) Determine the illumination angle

[0188] A. Based on the treatment plan, set the relevant parameters of the beam guidance system 1 so that the beam 102-5 emitted from the deflecting magnet B can be projected onto the treatment center 101 at the angle to the XY plane designed in the treatment plan.

[0189] B. Swing the radiator head 2 so that the axis of the radiator head 2 coincides with the axis of the beam 102-5.

[0190] C. Rotate the treatment chair 4-1 so that the beam 102-5 can be projected onto the treatment center 101 at the angle designed with respect to the YZ plane (or XZ plane) in the treatment plan.

[0191] 2) Scanning irradiation

[0192] Once the irradiation angle is determined, scanning and irradiation can begin.

[0193] After completing the first angle of irradiation, repeat steps 3-1) and 3-2) to perform the second angle of irradiation. Once all angles of irradiation are completed, one treatment session is finished.

[0194] After repeated positioning is completed, during the entire multi-angle irradiation process, the patient only feels the multiple rotations of the treatment chair 4-1, but the patient's posture relative to the treatment chair 4-1 remains unchanged, which is the goal of this invention.

Claims

1. A particle therapy system capable of spherical irradiation, comprising a beam guiding system (1) and a bidirectional scanning radiation head (2); wherein the beam guiding system (1) guides a particle beam (102) into the bidirectional scanning radiation head (2) and directs it toward a treatment center (101); characterized in that: It also includes a treatment chair system (4), which includes a treatment chair (4-1); in order to enable the patient to sit on the treatment chair (4-1) with the corresponding treatment area coinciding with the treatment center, it also includes a horizontal sliding plate (4-3) supporting the treatment chair (4), a horizontal sliding device that allows the treatment chair (4-1) to slide freely on the horizontal sliding plate (4-3), a vertical moving mechanism that allows the horizontal sliding plate (4-3) to move up and down, and a rotation mechanism that allows the horizontal sliding plate (4-3) to rotate around an axis around the front of the treatment chair (4). The rotating mechanism, wherein the horizontal sliding device is a magnetic sliding device, includes a passive magnetic sliding plate (4-2) disposed on the upper side of the horizontal sliding plate (4-3) and supporting the treatment chair (4), and an active magnetic sliding plate (4-4) disposed below the horizontal sliding plate (4-3); the active magnetic sliding plate (4-4) is disposed in the hollow frame (4-8) supporting the horizontal sliding plate (4-3), and the hollow frame (4-8) is provided with a mechanism to drive the active magnetic sliding plate (4-4) to slide sideways under the horizontal sliding plate (4-3). The moving power mechanism, the up-and-down moving mechanism (4-9) includes a vertical support (4-9-3) disposed in front of the hollow frame (4-8), a pair of vertical guide rails (4-9-2) disposed on the vertical support (4-9-3), and an up-and-down moving drive mechanism (4-9-4) that drives the up-and-down moving slider (4-9-1) disposed on the hollow frame (4-8) to slide up and down on the vertical guide rails (4-9-2). The rotating mechanism (4-10) around the axis includes a component connected to the vertical support (4-9-3). -3) is connected to a circular base of a rotating support shaft B (4-10-1); the rotating support shaft B (4-10-1) is mounted on a base B (4-10-2); the outer ring of the rotating support shaft B (4-10-1) is connected to the lower surface of the circular base of the vertical support (4-9-3), the inner ring of the rotating support shaft B (4-10-1) is connected to the upper surface of the base B (4-10-2), and the upper surface of the base B (4-10-2) is connected to a disc motor B (4-10-3).

2. The particle therapy system capable of spherical irradiation according to claim 1, characterized in that: It also includes a self-rotating mechanism (4-7); the self-rotating mechanism (4-7) includes a gyratory support shaft A (4-7-1) disposed under the hollow frame (4-8), the gyratory support shaft A (4-7-1) driving the hollow frame (4-8) to rotate around the gyratory axis of the gyratory support shaft A (4-7-1).

3. The particle therapy system capable of spherical irradiation according to claim 1 or 2, characterized in that: The beam guiding system (1) includes a deflecting magnet A (1-1) and a deflecting magnet B (1-2); the deflecting magnet A (1-1) is disposed on a base A (1-5), and on the base A (1-5), a pair of arc-shaped mounting plates (1-4) facing the treatment center (101) are disposed on both sides of the deflecting magnet A (1-1), and the deflecting magnet B (1-2) is clamped at the end of the mounting plates (1-4), forming a vacuum channel (1-3) between the mounting plates (1-4) for the beam (102) to be directed from the deflecting magnet A (1-1) to the deflecting magnet B (1-2).

4. The particle therapy system capable of spherical irradiation according to claim 3, characterized in that: The bidirectional scanning radiation head (2) includes a bidirectional guiding magnet (2-1) and a focusing coil (2-2); The bidirectional guiding magnet (2-1) includes an annular iron yoke (2-1-1) whose axis passes through the inner and outer walls of the treatment center (101) and floats outward along an arc from top to bottom; two sets of coils (2-1-2) are wound along the inner and outer walls of the annular iron yoke (2-1-1); an annular beam channel (2-1-3) of equal thickness and floats outward along an arc from bottom to top through the inner and outer walls of the two sets of coils (2-1-2); flange discs (2-1-4) are provided at the upper and lower ends of the annular iron yoke (2-1-1); and a cooling box (2-1-5) is provided outside the two sets of coils (2-1-2). The axis of the bundled coil (2-2) coincides with the axis of the annular yoke (2-1-1), and its bottom surface is connected to the upper surface of the upper flange disc (2-1-4). The junction box (2-3) mounted on the two clamps (1-4) enables the connection of the power and signal lines of the swingable bidirectional guide magnet (2-1) and the bundled coil (2-2) to the external power supply and monitoring device.

5. The particle therapy system capable of spherical irradiation according to claim 4, characterized in that: It also includes a radiation head swing mechanism (3) for swinging the bidirectional scanning radiation head (2); the radiation head swing mechanism (3) includes a horizontal plate (3-1) spanning between the mounting plates (1-4) and a ring guide rail (3-3) set outside the pair of mounting plates (1-4); The horizontal plate (3-1) has a circular hole through which a focusing coil (2-2) can pass; the bidirectional scanning radiation head (2) is mounted on the horizontal plate (3-1) by means of the focusing coil (2-2) passing through the circular hole; The mounting clamp (1-4) has an arc-shaped notch at its front end with the treatment center (101) as the center, and the ring guide rail (3-3) is disposed inside the arc-shaped notch of the mounting clamp (1-4). The two ends of the horizontal plate (3-1) include sliding mechanisms that are formed inwardly and connected to the ring guide rail (3-3).

6. The particle therapy system capable of spherical irradiation according to claim 4, characterized in that: It also includes a CT positioning system (5); the CT positioning system (5) includes a horizontally placed CT machine (5-1), the CT machine (5-1) has two opposite sides that are arc-shaped and the other two opposite sides that are right-angled; the CT machine (5-1) is mounted on a base C (5-3) using two columns (5-2).

7. The particle therapy system capable of spherical irradiation according to claim 4 further includes a dual X-ray machine repositioning system (6), the dual X-ray machine repositioning system (6) including two X-ray emitters (6-1) and two flat panel detectors (6-2), the two X-ray emitters (6-1) and the two flat panel detectors (6-2) are respectively located on both sides of a vertical plane of the treatment center (101) and are mirror symmetrical, the X-ray emitter (6-1) on one side of the vertical plane and the flat panel detector (6-2) on the other side of the vertical plane form an X-ray machine, the X-ray emitter (6-1) on one side of the vertical plane (6-1) ... (6-1) form an X-ray machine, the X-ray emitter (6-1) on one side of the vertical plane (6-1) and the flat panel detector (6-2) on the other side of the vertical plane (6-1) form an X-ray machine, the X-ray emitter (6-1) on one side of the vertical plane (6-1) and the flat panel detector (6-2) on the other side of the vertical plane (6-1) form an X-ray machine, the X-ray emitter (6-1) on one side of the vertical plane (6-1) and the flat panel detector (6-2) on the other side of the vertical plane (6 -1) The emitted detection beam (105) irradiates the surface of the flat panel detector (6-2) on the other side of the vertical plane, and makes the axis of the detection beam (105) perpendicular to the detection surface of the flat panel detector (6-2) and pass through the geometric center of the detection surface of the flat panel detector (6-2). The axis of the two detection beams (105) coincides with the horizontal plane where the beam (102) is located and intersects perpendicularly at the treatment center (101). The two X-ray emitters (6-1) are respectively installed in a box (6-1-1), and the back of the two flat panel detectors (6-2) are respectively connected to a column (6-2-1).

Images