An earthquake resistant, roller-supported, modular, isocentric gantry for supporting and rotating a radiation beam transport and delivery system on an axis of rotation around a stationary patient so as to precisely deliver a treatment beam to a predetermined target isocenter within the patient from several...http://www.google.de/patents/US5039057?utm_source=gb-gplus-sharePatent US5039057 - Roller-supported, modular, isocentric gentry and method of assembly
