A system for applying radiation treatment under computer control is disclosed. The system has a radiation source, which generates a variable intensity radiation beam, and a collimator. The collimator has a plurality of movable plates disposed in the path of the radiation beam and is oriented in a direction...http://www.google.ca/patents/US5216255?utm_source=gb-gplus-sharePatent US5216255 - Beam profile generator for photon radiation
