ESTRO 2025 - Abstract Book

S3108

Physics - Inter-fraction motion management and offline adaptive radiotherapy

ESTRO 2025

Conclusion: Dosimetry for plans optimised using bowel bags were comparable to bowel loops. Use of bowel bag instead of bowel loops has the potential to reduce Bladder and Cervical cancer oART time by 7.5mins (down to approximately 14.5min and 21.5min respectively), bringing it closer to standard IGBT treatments.

Keywords: oART, autosegmentation, time-saving

References: 1. Åström LM, et al. Online adaptive radiotherapy of urinary bladder cancer with full re-optimization to the anatomy of the day: Initial experience and dosimetric benefits 2. Shelley CE, et al. Implementing cone-beam computed tomography-guided online adaptive radiotherapy in cervical cancer 3. https://www.siemens-healthineers.com/en-uk/radiotherapy/software-solutions/autocontouringb 4. Rectal IMRT National Guidance Working Group. National rectal cancer intensity modulated radiotherapy (IMRT) guidance 5. Gay HA, et al. Pelvic Normal Tissue Contouring Guidelines for Radiation Therapy: A Radiation Therapy Oncology Group Consensus Panel Atlas