Particle therapy system
A particle therapy system includes an accelerator 1 which generates a particle beam for extraction, an irradiation apparatus 21 which irradiates the particle beam to an irradiation target 26 , a gantry 18 which rotates together with the irradiation apparatus 21 , and an MRI apparatus 50 which rotates together with the gantry 18 . The MRI apparatus 50 includes a magnetic circuit composed of an iron core 60 and a plurality of coils 61 serving as a magnetic flux source. The iron core 60 includes two oppositely disposed magnetic poles 63 A and 63 B, and a return yoke 64 for connecting the magnetic poles 63 A and 63 B. The magnetic poles 63 A, 63 B have cavities 65 A, 65 B. The particle beam passing through the cavity 65 A is irradiated to the irradiation target 26.
1. A particle therapy system, comprising:
an accelerator which generates a charged particle beam for extraction;
an irradiation apparatus which irradiates the charged particle beam to an irradiation target;
a gantry which rotates together with the irradiation apparatus; and
an MRI apparatus which rotates together with the gantry,
wherein the MRI apparatus includes a magnetic circuit having an iron core and a plurality of coils serving as a magnetic flux source,
wherein the iron core includes two oppositely disposed magnetic poles, and a member for connecting the magnetic poles, and
wherein the MRI apparatus is movable to a direction of a rotation axis of the gantry.
2. A particle therapy system, comprising:
an accelerator which generates a charged particle beam for extraction;
an irradiation apparatus which irradiates the charged particle beam to an irradiation target;
a gantry which rotates together with the irradiation apparatus; and
an MRI apparatus which rotates together with the gantry,
wherein the MRI apparatus includes a magnetic circuit having an iron core and a plurality of coils serving as a magnetic flux source,
wherein the iron core includes two oppositely disposed magnetic poles, and a member for connecting the magnetic poles,
wherein at least one of the magnetic poles has a cavity,
wherein the charged particle beam passing through the cavity is irradiated to the irradiation target, and
wherein the MRI apparatus is movable to a direction of a rotation axis of the gantry.
3. The particle therapy system according to claim 1 , further comprising:
a control apparatus which executes an ON/OFF control of irradiating the charged particle beam based on a signal from the MRI apparatus.
4. The particle therapy system according to claim 1 , further comprising:
a control apparatus for positioning of the charged particle beam before irradiation based on a signal from the MRI apparatus.
5. The particle therapy system according to claim 1 ,
wherein an advancing direction of the charged particle beam is parallel to a direction of a magnetic field generated by the MRI apparatus.
6. The particle therapy system according to claim 1 , further comprising:
an X-ray generator which generates X-rays for fluoroscopic imaging of the irradiation target, and an X-ray detector which detects the X-ray generated by the X-ray generator.
7. The particle therapy system according to claim 5 ,
wherein a line for connecting the X-ray generator and the X-ray detector is orthogonal to a direction of a magnetic field generated by the MRI apparatus.
8. The particle therapy system according to claim 5 ,
wherein the MRI apparatus is excited at a timing after using the X-ray generator.
9. The particle therapy system according to claim 1 ,
wherein the MRI apparatus is demagnetizable when a signal from the MRI apparatus is not used, or the MRI apparatus is moved in the gantry.
10. The particle therapy system according to claim 1 ,
wherein the oppositely disposed magnetic poles have the cavities each with the same shape at the same position.
11. The particle therapy system according to claim 1 ,
wherein the accelerator is any one of a synchrotron, a cyclotron, and a synchrocyclotron.
12. The particle therapy system according to claim 1 ,
wherein the irradiation apparatus is capable of executing a scanning irradiation process.