ESTRO 2025 - Abstract Book

S1480

Clinical – Mixed sites & palliation

ESTRO 2025

Results:

Dose differences for PTV D2%, D98% and mean dose were found to be less than 0.8% (see figure 1). The optimal CBCT-only workflow involves an interdisciplinary group consisting of 2 radiotherapy technicians (RTTs), 1 physician and 1 physicist. Dose planning is performed by the RTTs or physicians which required specific education in basic dose planning. Four new methods and three new checklists were introduced. The CBCT-only workflow takes 70 min between image acquisition and treatment delivery; signifying a 76%-time reduction when compared to acute pCT workflow (mean time of 293 min over 12 patients in the past 6 months). For non-acute cases, 5 days waiting time is omitted. Additionally, the consultation before treatment was incorporated to the treatment visit, where the treating physician could ensure target position by analyzing the anatomic origin of the pain. Conclusion: The proposed CBCT-only workflow is feasible, sparing two visits to the RT-department and thereby substantially reducing waiting times for patients with painful bone metastasis. References: 1. Shayna E. Rich, Ronald Chow, Srinivas Raman, K. Liang Zeng, Stephen Lutz, Henry Lam, Maurício F. Silva, Edward Chow, Update of the systematic review of palliative radiation therapy fractionation for bone metastases, Radiotherapy and Oncology, Volume 126, Issue 3, 2018, Pages 547-557 2. van Tol FR, Suijkerbuijk KPM, Choi D, Verkooijen HM, Oner FC, Verlaan JJ. The importance of timely treatment for quality of life and survival in patients with symptomatic spinal metastases, Eur Spine J, Volume 29, Issue 12, 2020, Pages 3170-3178 Keywords: dose planning, CBCT, palliative