Magnetic resonance-guided charged particle beam radiotherapy system

A magnetic resonance (MR)-guided parallel charged particle beam radiotherapy device, capable of generating charged particle beams parallel to a main magnetic field of MR, comprising:

• a charged particle beam accelerator, which comprises a linear accelerator, a cyclotron, or a synchrotron, and is configured for generating and accelerating a charged particle beam, allowing energy of the charged particle beam to reach an energy interval required for radiotherapy;
• a charged particle beam electromagnetic (EM) steering device, comprising a multi-stage EM steering coil set, the charged particle beam sequentially passing through the multi-stage EM steering coil set to generate a parallel charged particle beam in the same direction as the main magnetic field of MR;
• and
• an MR imaging device, comprising:
• main magnetic field coils of MR with central axes coinciding with that of the parallel charged particle beams, comprising an upper group of main magnetic field coils of MR and a lower group of main magnetic field coils of MR, an imaging and treatment area being formed therebetween, both the upper group of main magnetic field coils of MR and the lower group of main magnetic field coils of MR comprising imaging coils and shielding coils, the imaging coils being close to the imaging and treatment area, the shielding coils being away from the imaging and treatment area, and the imaging coil having a current opposite to that of the shielding coil in direction;
• a gradient magnetic field coil, for generating spatial magnetic field gradient changes to facilitate layer selection and localization of imaging;
• and
• a body coil, for generating a radio-frequency field to excite proton resonance in the tissue and receive magnetic resonance relaxation signals to complete a reconstruction.