Patent ID: 6034377
Filing Date: 2000-03-07
Classification: A61N,G21K

Abstract:
A charged particle beam irradiation apparatus comprising:scanning magnetic field generating means comprising two electromagnets arranged in series along a direction of an incident axis of a charged particle beam and deflecting the charged particle beam in opposite directions,energy modulating means comprising a cylindrical member having a length and a distribution of wall thickness in a circumferential direction, means for rotating the cylindrical member around a rotation axis, and detecting means for detecting angle of rotation of the cylindrical member, the energy modulating means being disposed at a downstream side of the scanning magnetic field generating means so that the charged particle beam passes through the rotation axis,energy attenuating means for limiting energy of the charged particle beam, andmeans for rotating the scanning magnetic field generating means and the energy modulating means together around the incident axis of the charged particle beam.