ESTRO 2022 - Abstract Book

S282

Abstract book

ESTRO 2022

Results The mean absorbed dose deviations between sCT and CT plans were within 1% for all DVH parameters for PTVs and <3% for OARs, as shown in Table 1 and Figure 1. The differences were considered clinically acceptable for all the DVH parameters. The 2D-local gamma analysis showed a good agreement between the sCT and CT plan dose distributions with an average passing rate value of 99.1±1.0%, and 96.5±2.6%, using an acceptance criterion of 3%/3mm and 2%/2 mm, respectively.

Conclusion This study shows that the sCT, generated with the combination of a multi atlas-based approach and the bulk ED assignment, achieved clinically feasible dosimetric results in an MRgRT workflow for H&N cancer radiotherapy. Thus, it represents a