Radiotherapy planning and delivery

摘要

Methods and systems of radiotherapy planning and delivery are disclosed In which a radiation beam is directed towards a time-averaged mean position of the target during radiatlon-on. In addition, the radiation beam is gated to deliver radiation to the target only when the target is within a treatment volume centred on the mean position. Treatment plans according to embodiments of the present invention result In low doses to the surrounding healthy tissue, but high duty cycles and quicker treatment times.