207. Impact of IGRT on correct set-up of patients with prostate cancer: Experience of our center

Purpose The purpose of this study is to quantify displacements in image-guided radiotherapy (IGRT) for prostate cancer patients and to evaluate the impact of IGRT on the quality of radiotherapy treatments in terms of rectal toxicities. Methods From January to October 2017, 46 patients with prostate cancer were treated. All patients were planned with volumetric-modulated arc therapy (VMAT) technique, receiving hypofractionated radiotherapy for a...