VMAT SX1

Name (ID): AAMD2015, HCSWB_SIB (AAMD2015)
Plan or PlanSum ID: HCSWB_SIB4a

Four (4) arc VMAT technique was chosen and 4 almost complete arcs were used.  Each arc used a different start and stop angle (offset by 1 degree) to stagger the available control points throughout each arc rotation and unique collimator rotations per field were automatically generated utilizing the arc geometry tool. 

The plan challenge plan quality metric grading criteria was designed expecting the use a non-coplanar  arc arrangement with a vertex arc, but this beam arrangement proved not to be critical as the resulting coplanar plan created here scored higher than 80% of the cases submitted in this year’s challenge  The resulting plan suffers a bit in the homogeneity criteria mainly as a result of a less sharp dose gradient around the metastases, likely due to being limited to a coplanar arc arrangement. 

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