ESTRO 2023 - Abstract Book

S1613

Digital Posters

ESTRO 2023

Conclusion Our results demonstrate the good performance of our network in generating s4DCT of the abdominal site. These could be used to support treatment planning and off-line adaptation within the CIRT workflow of abdominal tumors. In the future, our network’s performance will be tested with larger patient datasets and a dosimetric analysis will be performed.

PO-1870 Detailed analysis of patient stability during spine SBRT without immobilization

I. Remmerts de Vries 1 , W. Verbakel 1 , M. Dahele 1 , B. Slotman 1

1 Amsterdam University Medical Center, Radiation Oncology, Amsterdam, The Netherlands

Purpose or Objective Stereotactic body radiotherapy (SBRT) for treatment of spine metastases attempts to maximize target coverage and limit spinal cord/cauda equina dose through steep dose gradients. Accurate positioning and spine stability during treatment ensure consistency between planned and delivered dose. We analyzed our experience with online markerless 3D positional monitoring of the spine in patients undergoing spine SBRT without immobilization, on a TrueBeam platform. Materials and Methods We have used non-clinical RapidTrack Realtime (RTR) software (Varian Medical Systems) to monitor spine position during stereotactic treatments. This analysis is concerned with patients treated using 5-fraction SBRT for lesions at thoracic