ESTRO 2025 - Abstract Book

S4293

RTT - Service evaluation, quality assurance and risk management

ESTRO 2025

Conclusion: Results demonstrated that ROI occlusion can occur when lateral cameras are blocked particularly between 10-60 degrees for the CBCT arc. The greatest percentage of ROI occlusion at CBCT 60 degrees occurred at the superior lateral aspects of the ROIs. Therefore, ensuring adequate inferior and lateral ROI coverage may create a robust ‘monitoring’ ROI and in clinical practice may involve merging aspects of both ROI_T and ROI_WBFC. Further research is required with patient data to establish clinical workflows.

Keywords: SGRT, camera occlusion, region-of-interest

References: 1.Al ‐ Hallaq et al. AAPM task group report 302: SGRT. Med.Phys.2022;49(4):e82-e112. 2.Bellala et al. Review of clinical applications and challenges with surface-guided radiation therapy. J.Cancer Res.Ther. 2023;19(5):1160-9. 3.Freislederer et al. ESTRO-ACROP guideline on surface guided radiation therapy. Radiat.Oncol. 2022;173:188-96. 4.Huijskens et al. Clinical practicality and patient performance for surface-guided automated VMAT gating for DIBH breast cancer radiotherapy. Radiat.Oncol. 2024;195:110229. 5.Sauer et al. Region of interest optimization for surface guided radiation therapy of breast cancer. J.Appl.Clin.Med.Phys. 2021;22(10):152-60. 6.VisionRT. MyVisionRT Portal [cited 2024 Oct 27] Available from: https://portal.myvisionrt.com/