Monte Carlo simulation for imaging dose estimation: application to the Elekta XVI kV-CBCT

International audiencePurpose/Objective: Cone-Beam Computed Tomography (CBCT) is progressively more used in clinical practice to ensure precision in target localization and patient positioning required by new radiotherapy treatment techniques. However, intensive use of image guidance procedures could add a significant extra dose to normal tissues and potentially amplify the risk for patients to develop radiation-induced cancer. Therefore, there is an increasing interest to evaluate the dose delivered by CBCT scans. The most accurate tool to evaluate this imaging dose is the Monte Carlo (MC) method. To this end, this study aims at developing a MC-based dose calculation tool to compute the imaging dose, and to validateit in pre-clinical conditions against dosimetric measurements