Patent ID: 6080992
Filing Date: 2000-06-27
Classification: A61N,G21K

Abstract:
An apparatus for fixing a radiation beam irradiation field forming member to form an irradiation field matching with a shape of an object to be irradiated, when radiation beams are irradiated in a gantry, which fixes, to an end of radiation beam irradiating section within the gantry, the irradiation field forming member which comprises a bolus and a final collimator, of which the former adjusts a shape of cross-section of irradiation field at largest depth; and the latter finally determines a shape of the irradiation field, comprising:a frame fixed on an end of radiation beam irradiating section and having on both sides grooves through which the bolus and the final collimator to be inserted from front;a door through which the bolus and the final collimator which have been inserted into the frame are pushed from front up to a specified position; anda member which places the bolus and the final collimator thus pushed by way of the door into proper position at rear part of the frame.