System and method for simulating a two-dimensional radiation intensity distribution of photon or electron beams

摘要

To simulate radiation intensity distribution of a radiation beam having a field region, a penumbra region, and a scatter tail region changes in radiation intensity distribution of a reference radiation beam in the penumbra region at a reference distance from the radiation source are determined. Next, radiation intensity distribution, at the reference distance, of a radiation beam of arbitrary shape, in the field and tail regions is determined. The radiation intensity distribution of the radiation beam of arbitrary shape is simulated by superimposing the changes in radiation intensity of the reference radiation beam in the penumbra region on to the radiation intensity of the radiation beam of arbitrary shape in the field region and the tail region.