Patent ID: 9289624
Filing Date: 2016-03-22
CPC Classification: A61N,G21K

Claim Text:
1. A particle therapy apparatus comprising: a particle beam generator configured to output a particle beam having a predetermined energy; an energy degrader for reducing an energy of the predetermined-energy particle beam, the energy degrader configured to output a degraded particle beam having an energy spread that is increased with respect to an energy spread of the predetermined-energy particle beam; and a rotatable gantry including: wherein the spacing of the adjustable spread-limiting device is configured to be adjusted to a selected beam opening based on a selected value reflecting a maximum energy spread for the limited beam to be output by the adjustable spread-limiting device, and wherein the adjustable spread-limiting device is installed downstream of the first dipole magnet and upstream of the last dipole magnet of the plurality of dipole magnets, and there is no energy analyzer between the energy degrader and the gantry entrance point.