ESTRO 2024 - Abstract Book

S5604

RTT - Patient care, preparation, immobilisation and IGRT verification protocols

ESTRO 2024

Conclusion:

SGRT proved to be valuable in reducing the daily set-up errors for kV/kVs in the vertical and lateral direction and for CBCTs in all translational directions. At initial kV/kV, population systematic and random errors were similar, tattoo based set-ups had larger vertical and lateral errors, with more significant systematic and random errors in the longitudinal direction using SGRT. CBCT imaging results indicated lower population systematic and random errors using SGRT compared to tattoo-based set ups in all translational directions.

Keywords: prostate cancer, surface-guided radiation therapy

2717

Digital Poster

Randomized self-controlled study open-face vs. closed masks: mask stability and positioning accuracy

Michèle Keane, Indira Madani, Riccardo Dal Bello, Antonia Schiess, Sophie Perryck, Katja Tomuschat, Stephanie Tanadini-Lang, Matthias Guckenberger, Michelle Brown

University Hospital Zürich, Department of Radiation Oncology, Zürich, Switzerland

Purpose/Objective:

Standard immobilization for fractionated cranial radiotherapy is a closed thermoplastic mask, which allows for stable and reproducible patient positioning. This randomized trial investigated positioning based on a closed mask versus