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A graphic comparison of Dice Similarity Coefficient (DSC) in VMAT (a) and IMRT (b) plans. The DSC is the ratio between the V 98% intersection with V PTV (purple) to the V 98% union with V PTV (yellow). The VMAT allows a much conformal plan (a) where 98% of the dose is given to almost all of the PTV and does not leak outside the PTV compared to the IMRT plan.
