WE‐A‐304‐02: Strategies and Technologies for Cranial Radiosurgery Planning: Gamma Knife

The high fractional doses, stringent requirements for accuracy and precision, and surgical perspective characteristic of intracranial radiosurgery create considerations for treatment planning which are distinct from most other radiotherapy procedures. This session will introduce treatment planning techniques specific to two popular intracranial SRS modalities: Gamma Knife and MLC‐based Linac. The basic treatment delivery characteristics of each device will be reviewed with a focus on how those characteristics determine the paradigm used for treatment planning. Basic techniques for treatment planning will be discussed, including considerations such as isodose selection, target and organ‐at‐risk definition, quality indices, and protection of critical structures. Future directions for SRS treatment planning will also be discussed. Learning Objectives: 1.Introduce the basic physical principles of intracranial radiosurgery and how they are realized in the treatment planning paradigms for Gamma Knife and Linac radiosurgery. 2.Demonstrate basic treatment planning techniques. 3.Discuss metrics for evaluating SRS treatment plan quality. 4.Discuss recent and future advances in SRS treatment planning. D. Schlesinger receives research support from Elekta, AB