Self-shielding spherical accelerator
The design of a self-shielded spherical accelerator solves the complexity and limitations of non-coplanar treatment methods, achieves high-precision whole-body treatment, reduces external radiation, and improves treatment effects and patient experience.
Patent Information
- Application Number
- CN202422453412.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-09
AI Technical Summary
Existing medical accelerators with non-coplanar treatment methods have problems such as long treatment time, inability to adjust the incident angle, and complex operation. In addition, the traditional spherical frame design is not suitable for whole-body treatment. ZAP-X is limited to head treatment.
A self-shielded spherical accelerator is designed. It uses components such as a frame support base, a rotating base, a fork arm, and a treatment head to achieve isolation between the inner and outer spherical shells. The spherical motion of the high-precision treatment head is achieved through the movement of the rotating base and the fork arm, and metal radiation blocks are used to reduce external radiation.
It achieves high-precision 4π treatment, reduces external radiation, reduces the requirements for shielded room construction, improves treatment effects and patient experience, and is suitable for patients with larger body sizes.
Smart Images
Figure CN223380986U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a spherical accelerator, in particular to a self-shielding spherical accelerator, belonging to the technical field of medical equipment. Background Art
[0002] Currently, mainstream medical electron linear accelerators utilize C-arms and O-rings, both of which utilize coplanar treatment. Coplanar treatment involves all radiation fields being distributed on the same anatomical plane. Non-coplanar treatment involves all radiation fields being distributed on different anatomical planes. Compared to coplanar treatment, non-coplanar treatment allows for greater flexibility in field configuration and provides better protection for vital tissues and organs. Currently, non-coplanar treatment is a mainstream research area, supported by accelerators such as CyberKnife, TOMO, and TrueBeam. However, these approaches have limitations, such as the long treatment time and unsuitability of CyberKnife for large lesions; the inability to adjust the incident angle of TOMO; and the complex operation of TrueBeam's HyperArc, which utilizes a rotating table for non-coplanar treatment. Spherical treatment (4πRT) is the preferred non-coplanar treatment method. Currently, a spherical gantry is the optimal method for delivering 4πRT. The ZAP-X is a relatively novel spherical gantry design specifically designed for head treatment. However, spherical accelerators for whole-body treatment are not yet commercially available.
[0003] However, the current medical accelerators for non-coplanar treatment methods do not use spherical frames, and different implementation methods of simulated spherical treatments bring different problems. Some have long treatment times and are not suitable for large lesions, some cannot adjust the incident angle, and some are complicated to operate. The ZAP-X design is more ingenious, but it can only treat the head. The traditional C-arm design has a head movement speed and control accuracy that are not as good as the "O" type machine; however, the "O" type machine needs a lathe to achieve 4π treatment, which increases the complexity of control. The head angle after the lathe is also subject to corresponding restrictions. Utility Model Content
[0004] The purpose of this utility model is to provide a self-shielding spherical accelerator to solve the above problems, overcome the various problems caused by using a non-spherical frame to achieve spherical treatment, return to the essence of spherical treatment, improve the treatment effect, and at the same time reduce external radiation and lower the protection requirements for shielding room construction.
[0005] The utility model achieves the above-mentioned object through the following technical solutions: a self-shielded spherical accelerator, comprising a frame support base, the frame support base is rotatably connected to a rotating base, two first pairs of fork arms are fixedly mounted on the rotating base, two second pairs of fork arms are fixedly connected to the rotating base, one of the first pairs of fork arms is movably mounted on a KV-level CBCT tube, the other first pair of fork arms is movably mounted on a CT detector, one of the second pairs of fork arms is movably mounted on a treatment head, and the other second pair of fork arms is movably mounted on a radiation block. A spherical inner shell can be placed in the treatment space as needed to isolate the patient from the frame, and a spherical outer shell can also be designed to wrap the entire frame, and a patient entrance can be left in the spherical inner shell or the spherical outer shell.
[0006] Preferably, the two first pairs of fork arms are symmetrically distributed about the center of the rotating seat, the two second pairs of fork arms are symmetrically distributed about the center of the rotating seat, and the plane formed by the two first pairs of fork arms and the plane formed by the two second pairs of fork arms are perpendicular to each other.
[0007] Preferably, the first pair of fork arms are in an arc-shaped structure, and the arc radius of the first pair of fork arms is 1.2 meters; the second pair of fork arms are in an arc-shaped structure, and the arc radius of the second pair of fork arms is 1.2 meters.
[0008] Preferably, the initial position of the treatment handpiece is located in the middle of the second pair of fork arms, and the treatment handpiece can move within a range of 40 degrees to the left and right of the middle of the second pair of fork arms.
[0009] Preferably, the rotation speed of the rotating seat is four revolutions per minute, the movement speed of the treatment head is ten degrees per second, and the radiation block is linked with the treatment head and is always in the irradiation path of the treatment head (7) to block the radiation.
[0010] Preferably, a treatment bed base is provided on one side of the frame support seat, the top of the treatment bed base is fixedly connected to the treatment bed, and one end of the rotating seat is fixedly connected to the frame counterweight block.
[0011] Preferably, the arc center of the first pair of fork arms and the second pair of fork arms is the center of the sphere, and the lowest point of the treatment handpiece is 650 mm away from the center of the sphere.
[0012] Preferably, the opening distance between the two first pairs of fork arms close to one end of the treatment bed base is 1100 mm, and the distance from one end of the treatment bed to the center of the sphere is 1000 mm.
[0013] The beneficial effects of the present invention are: the self-shielding spherical frame design can achieve the movement speed and control accuracy of the "O" type machine, truly realize the spherical movement of the treatment head, and perform standard 4π treatment. The radiation block is made of metal material, and the design value is slightly larger than 3 HVL layer thicknesses of the X-ray used (one-tenth layer, the material layer thickness corresponding to the ray attenuation to one-tenth of the initial energy), which can reduce the field energy value to below 1‰, reduce external radiation, and effectively reduce the construction requirements of the shielding room. At the same time, the block can play a role in balancing the weight, and control the center of gravity of the entire frame assembly near the center of the sphere, which plays a positive role in the movement accuracy control of the frame. The treatment space is large, and the frame design can exceed the treatment space radius of 500mm, which is beneficial to improving the patient experience. At the same time, it can treat patients with larger bodies, and the treatment site is not restricted. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0015] Figure 2 This is a schematic diagram of the connection structure between the treatment bed base and the treatment bed of the present invention;
[0016] Figure 3 This is a schematic diagram of the connection structure between the first pair of fork arms and the KV-level CBCT tube of the present invention.
[0017] In the figure: 1. gantry support base; 2. swivel base; 3. first pair of fork arms; 4. KV-class CBCT tube; 5. CT detector; 6. second pair of fork arms; 7. treatment handpiece; 8. radiation block; 9. treatment bed base; 10. treatment bed; 11. gantry counterweight. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0019] See also Figure 1 、 Figure 2 and Figure 3As shown, a self-shielded spherical accelerator includes a gantry support base 1, on which a rotating base 2 is rotatably connected, two first pairs of fork arms 3 are fixedly mounted on the rotating base 2, and two second pairs of fork arms 6 are fixedly connected to the rotating base 2. A KV-level CBCT tube 4 is movably mounted on one of the first pairs of fork arms 3, and a CT detector 5 is movably mounted on the other first pair of fork arms 3. A treatment head 7 is movably mounted on one of the second pairs of fork arms 6, and a radiation block 8 is movably mounted on the other second pair of fork arms 6. A spherical inner shell can be placed in the treatment space as needed to isolate the patient from the gantry, and a spherical outer shell can also be designed to wrap the entire gantry, and a patient entrance can be left in the spherical inner shell or the spherical outer shell.
[0020] As a technical optimization solution of the utility model, Figure 1 、 Figure 2 and Figure 3 As shown, the two first pairs of fork arms 3 are symmetrically distributed about the center of the rotating base 2, and the two second pairs of fork arms 6 are symmetrically distributed about the center of the rotating base 2. The plane formed by the two first pairs of fork arms 3 and the plane formed by the two second pairs of fork arms 6 are perpendicular to each other. The first pair of fork arms 3 are in an arc-shaped structure, and the arc radius of the first pair of fork arms 3 is 1.2 meters. The second pair of fork arms 6 are in an arc-shaped structure, and the arc radius of the second pair of fork arms 6 is 1.2 meters. The initial position of the treatment head 7 is located in the middle of the second pair of fork arms 6, and the treatment head 7 can move within a range of 45 degrees to the left and right of the middle of the second pair of fork arms 6. The rotation speed of the rotating base 2 is four revolutions per minute, and the movement speed of the treatment head 7 is ten degrees per second. The radiation block 8 and the treatment head 7 are linked together and are always in the irradiation path of the treatment head 7 to block the rays, thereby realizing a true self-shielding spherical frame design with high movement and control precision.
[0021] As a technical optimization solution of the utility model, Figure 1 and Figure 2 As shown, a treatment bed base 9 is provided on one side of the gantry support base 1, and a treatment bed 10 is fixedly connected to the top of the treatment bed base 9. One end of the rotating base 2 is fixedly connected to a gantry counterweight 11. Therefore, by providing the gantry counterweight 11 on one side of the gantry support base 1, the roll caused by the weight of the treatment system, the kV-level imaging system and the gantry can be balanced, thereby improving the overall stability.
[0022] As a technical optimization solution of the utility model, Figure 1 and Figure 2As shown, the arc center of the first pair of fork arms 3 and the second pair of fork arms 6 is the center of the sphere, the lowest point of the treatment head 7 is 650 mm from the center of the sphere, the opening distance between the two first pairs of fork arms 3 near one end of the treatment bed base 9 is 1100 mm, and the distance from one end of the treatment bed 10 to the center of the sphere is 1000 mm. Therefore, a larger treatment space can be obtained, and larger patients can be treated.
[0023] When the present invention is in use, the patient can lie on the treatment bed 10 during use, and then by rotating the rotating seat 2, the rack counterweight 11 is set on one side of the rack support seat 1 to balance the side tilt caused by the treatment system, kV-level imaging system and the rack's own weight, thereby improving the overall stability. The rotation of the rotating seat 2 will drive the two first pairs of fork arms 3 and the two second pairs of fork arms 6 to move. When the rotating seat 2 rotates, the treatment head 7 and the radiation block 8 will swing left and right on the two first pairs of fork arms 3 respectively, with a swing amplitude of eighty degrees. Therefore, when the rotating seat 2 rotates, the treatment head 7 can swing back and forth, thereby fully meeting the treatment angle requirements of various parts, and at the same time, the movement speed and control accuracy of the "O" type machine can be achieved, truly realizing the spherical movement of the treatment head, and performing standard 4π treatment, thereby effectively improving the treatment effect. During the treatment process A KV-level imaging system can be formed by the KV-level CBCT tube 4 and the CT detector 5. During the movement of the treatment head 7, the radiation block 8 follows the linkage and is always in the irradiation path of the treatment head 7 to block the rays. Since the radiation block 8 is made of metal material, the design value is slightly larger than 3 HVL layer thicknesses of the X-ray used (one-tenth layer: the material layer thickness corresponding to the ray attenuation to one-tenth of the initial energy), so the field energy value can be reduced to below 1‰, reducing external radiation and effectively reducing the construction requirements of the shielding room. At the same time, the radiation block 8 can play a role in balancing the weight, controlling the center of gravity of the entire frame assembly near the center of the sphere, which plays a positive role in the movement accuracy control of the frame, and the frame design can exceed the treatment space radius of 500mm, which is beneficial to improving patient experience. At the same time, it can treat patients with larger bodies and the treatment site is not restricted.
[0024] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.
[0025] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A self-shielded spherical accelerator, comprising a frame support base (1), characterized in that: The gantry support base (1) is rotatably connected to a rotating base (2), two first pairs of fork arms (3) are fixedly mounted on the rotating base (2), two second pairs of fork arms (6) are fixedly mounted on the rotating base (2), a KV-level CBCT tube (4) is movably mounted on one of the first pairs of fork arms (3), a CT detector (5) is movably mounted on the other first pair of fork arms (3), a treatment machine head (7) is movably mounted on one of the second pairs of fork arms (6), and a radiation block (8) is movably mounted on the other second pair of fork arms (6), a spherical inner shell can be placed in the treatment space as needed to isolate the patient from the gantry, and a spherical outer shell can also be designed to wrap the entire gantry inside, and a patient entrance can be left in the spherical inner shell or the spherical outer shell.
2. A self-shielding spherical accelerator according to claim 1, characterized in that: The two first pairs of fork arms (3) are symmetrically distributed about the center of the rotating seat (2), the two second pairs of fork arms (6) are symmetrically distributed about the center of the rotating seat (2), and the planes formed by the two first pairs of fork arms (3) and the planes formed by the two second pairs of fork arms (6) are perpendicular to each other.
3. The self-shielding spherical accelerator according to claim 1, characterized in that: The first pair of fork arms (3) is an arc-shaped structure, and the arc radius of the first pair of fork arms (3) is 1.2 meters. The second pair of fork arms (6) is an arc-shaped structure, and the arc radius of the second pair of fork arms (6) is 1.2 meters.
4. The self-shielding spherical accelerator according to claim 1, characterized in that: The initial position of the treatment machine head (7) is located in the middle of the second pair of fork arms (6), and the treatment machine head (7) can move within a range of 40 degrees to the left and right of the middle of the second pair of fork arms (6).
5. The self-shielding spherical accelerator according to claim 1, characterized in that: The rotation speed of the rotating seat (2) is four revolutions per minute, the movement speed of the treatment head (7) is ten degrees per second, and the radiation block (8) and the treatment head (7) are linked together and are always located in the irradiation path of the treatment head (7) to block the radiation.
6. The self-shielding spherical accelerator according to claim 1, characterized in that: A treatment bed base (9) is provided on one side of the frame support seat (1), a treatment bed (10) is fixedly connected to the top of the treatment bed base (9), and one end of the rotating seat (2) is fixedly connected to a frame counterweight (11).
7. The self-shielding spherical accelerator according to claim 6, characterized in that: The arc center of the first pair of fork arms (3) and the second pair of fork arms (6) is the center of the sphere, and the lowest point of the treatment machine head (7) is 650 mm away from the center of the sphere.
8. The self-shielding spherical accelerator according to claim 7, characterized in that: The opening distance between the two first pairs of fork arms (3) close to one end of the treatment bed base (9) is 1100 mm, and the distance from one end of the treatment bed (10) to the center of the sphere is 1000 mm.