ESTRO 2025 - Abstract Book

S3298

Physics - Intra-fraction motion management and real-time adaptive radiotherapy

ESTRO 2025

Conclusion: The prototype system validated the possible utility of single frame x-ray tomosynthesis as a modality for guiding ablative lung radiotherapy.

Keywords: SBRT, tomosynthesis, tracking

References: [1] Hsieh SS, Ng LW. (2017). Real ‐ time tomosynthesis for radiation therapy guidance. Medical Physics , 44 (11), 5584 5595. [2] Hsieh SS, Ng LW, Cao M, Lee P. (2022). A simulated comparison of lung tumor target verification using stereoscopic tomosynthesis or radiography. Medical Physics , 49 (5), 3041-3052.

3222

Digital Poster Performance characterisation of the first open-source couch tracking system for accurate and efficient real time adaptive radiotherapy Ann Yan, Chandrima Sengupta, Elshin Mathias, Julia Johnson, Paul Keall Image X Institute, University of Sydney, Sydney, Australia Purpose/Objective: There is a strong clinical driver for real-time image guided radiotherapy (IGRT) – treatment side effects are halved. 1,2 However, most real-time IGRT methods are only connected to the gating interface, converting the complex tumour motion signal into a binary signal, either beam on or beam hold. To fully utilise the motion signal, increase targeting accuracy and efficiency, real-time adaptive radiotherapy could be achieved by couch tracking 3 or MLC tracking, 4 but neither of these technologies are commercially available. We solved the lack of access problem by