ESTRO 2023 - Abstract Book

S2045

Digital Posters

ESTRO 2023

Conclusion Image acquisition reduced in the groups with a personalised neck cushion. The portrait system improved neck flexion reducing lateral KV imaging, however further evaluation of system (c) with a larger patient cohort is required.

PO-2274 The impact of patient positioning lasers on setup accuracy for MR-Linac radiotherapy

L. Hogan 1 , M. Jameson 2 , D. Crawford 2 , K. Biggerstaff 1 , M. Picton 2 , C. Tran 2 , L. McKenzie 2 , T. Liang 1 , M. Carr 2 , J. DeLeon 2 , H. Tan 1 , V. Batumalai 2

1 GenesisCare, Radiation Oncology, Perth, Australia; 2 GenesisCare, Radiation Oncology, Sydney, Australia

Purpose or Objective Accurate and reproducible patient positioning is required for precise treatment delivery, especially in the use of intensity modulated radiotherapy (IMRT) and stereotactic ablative body radiotherapy (SABR). Traditionally, the first step in patient alignment has relied on lasers in the treatment room to reduce setup errors. The introduction of online adaptive treatment on the MR-Linacs may see the lasers for patient positioning as redundant. This study aimed to compare differences in setup errors measured with and without the use of lasers in patients treated on the MR-Linac.

Materials and Methods