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SU-E-T-170: A Viable Approach to Patient Specific QA for Spine VMAT SRS Using EPID-Based Dosimetry.

Med Phys 2012 Jun;39(6Part12):3742

Memorial Sloan-Kettering Cancer Center, Basking Ridge, NJ.

Purpose: VMAT involves multi-parameter modulations, thus presenting multi-dimensional challenges. Here, we present a viable approach to VMAT patient specific QA using EPID-based dosimetry for spine VMAT SRS casesMethods: Our spine VMAT SRS plans consisted of two full arcs and were optimized with 6 MV photons for a Varian Trilogy LINAC. The QA plans were computed by resetting all control points to 0° gantry angle while keeping the MLC apertures and corresponding MU weights intact. Read More

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