Proton-arc beam delivery system

A particle beam therapy system with a configuration of magnetic fields for delivering a particle beam for particle radiation therapy to a target volume in a patient from different treatment angles, the system comprising:

• a) a particle beam directed towards an active static magnetic field region, a direction of the particle beam incoming into said magnetic field region being substantially perpendicular to a direction of a magnetic field in said magnetic field region;
• b) said active static magnetic field region having a plurality of magnets and/or coils disposed to generate a cylindrically shaped magnetic field system filled with magnetic fields that are oriented substantially in an axial direction of said cylindrically shaped magnetic field system, said magnetic field region including an outer radial guiding field region and an inner radial bending field region;
• c) said plurality of magnets and/or coils being distinguished into:
• c1) an arc scan magnet system located at an outer edge of said cylindrically shaped magnetic field system;
• said arc scan magnet system effecting a radial displacement and angle to the particle beam, determining a location where the particle beam enters the guiding field region;
• c2) a first number of coils, optionally embedded in an iron enclosure, for generating a static magnetic guiding field for the incoming particle beam that has been initially deflected by said arc scan magnet system, the magnetic guiding field being predominantly effective in said outer radial guiding field region of said cylindrically shaped magnetic field system and enclosing said inner radial bending field region;
• c3) a second number of coils, optionally embedded in an iron enclosure, for generating a static magnetic bending field for the particle beam exiting said magnetic guiding field region, the magnetic bending field being predominantly effective in said inner radial bending field region of said cylindrically shaped magnetic field system;
• d) a central region encompassing a treatment table for the patient, said central region being surrounded by said inner radial region of said cylindrically shaped magnetic field system;
• and e) a treatment control system configured to control said plurality of magnets and/or coils in order to bring the particle beam into the desired treatment angles according to a treatment plan determining dose information to be deposited by the particle beam in the target volume of the patient.