ESTRO 2022 - Abstract Book

S1303

Abstract book

ESTRO 2022

PO-1523 Comparison of two MLCs for SRS HyperArc plans

J. Calvo-Ortega 1 , S. Moragues-Femenía 1 , C. Laosa-Bello 1

1 hospital Quirónsalud Barcelona, Oncología Radioterápica, Barcelona, Spain

Purpose or Objective Aim: To compare SRS plans calculated with the Varian HyperArc (HA) technique and two types of MLCs.

Materials and Methods Materials and Methods:

Twenty five SRS (thirty nine lesions) cases planned using the Varian 120 MLC (5 mm width central leaves) were retrospectively planned using the Varian High Definition (HD) MLC (2.5 mm width central leaves). The number of lesions per case ranged from 1 to 5. Lesion diameter ranged from 8 to 33 mm. A single-isocenter plan was designed for each case with 6 MV FFF photon beams from a Truebeam linac.