Treatment Planning for Image-Guided Robotic Radiosurgery

Radiosurgery is a non-invasive procedure that uses focused beams of radiation to destroy brain tumors. Treatment planning for ra-diosurgery involves determining a series of beam conngurations that will destroy the tumor without damaging healthy tissue in the brain, particularly critical structures. A new image-guided robotic radiosurgical system has been developed at Stanford University in a joint project with Accu-ray, Inc. It has been in clinical use at Stanford since July, 1994, and thus far three patients have been treated with it. This system provides much more exibility for treatment planning than do traditional radiosurgical systems. In order to take full advantage of this added exibility, we have developed automatic methods for treatment planning. Our planner enables a surgeon to specify constraints interactively on the distribution of dose delivered and then to nd a set of beam conngurations that will satisfy these constraints. We provide a detailed description of our treatment planning algorithms and summarize our rst experiences using the system in a clinical setting.