Dose Impact of Systemic MLC Position Error for Esophagus Cancer Plan: Volumetric Modulated Arc Therapy Versus Step and Shoot Modulated Therapy

Purpose/Objective(s)For esophageal treatment, some studies demonstrated that the volumetric modulated arc therapy (VMAT) can reduce the treatment time compared to the step and shoot modulated therapy (IMRT). On the other hand, the low dose to the lung was lower in IMRT technique. The systemic MLC leaf position error may occur during the VMAT and IMRT delivery. We applied the hypothesis that VMAT technique was more sensitive to the systemic MLC...