RADIATION ENERGY DISTRIBUTION REGULATING MECHANISM AND RADIATION IRRADIATION METHOD AND DEVICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To realize a dose distribution reproducing correctly an optional three- dimensional shape without using a correction device prepared for each patient. SOLUTION: A three-dimensional dose distribution is obtained by controlling the amount of radiation absorption in each position in the direction of slits of a variable bolus 42 prepared by a radiation energy absorber and whose amount of radiation absorption is made variable in each position in the direction of slits and scanning a slit-shaped dose distribution formed by a slit collimator 50 and the variable bolus 42.