PO-1010: A crowd-knowledge-based analysis of DVHs in SBRT: first steps towards a national virtual audit

Introduction and Objectives Currently, most of the multicenter analyses on treatment planning rely on selected data extraction from the dose volume histogram (DVH) of each plan. Different treatment planning systems employ different algorithms to generate the DVH. This can bias a grouped analysis due to possible poor data consistency. In order to make data comparable, a homogeneous method for data extraction is necessary. In this work we used a consistent method to present a preliminary analysis of multiple data coming from a national survey on stereotactic body radiotherapy (SBRT) planning.