Abstract
Background and Objective: Deviation between a linac-based stereotatic radiosurgery (SRS) collimator axis and the machine isocenter can result an obvious dose distribution error, and therefore make the treatment fail and serious injure the patient, since SRS treatment has characteristic of high dose fraction and sharpen dose distribution. This deviation usually comes from the mechanical location of the SRS collimator and need to be check and adjusted before the system is validated to be used for treatment. Verification of the coincidence of collimator axis and the linac isocenter is a very important and time consuming part of the SRS quality assurance procedure. EPID can be used as a quick tool to verify the beam direction and significantly shorten the routine QA time expenses of SRS.
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