ESTRO 2025 - Abstract Book

S3689

Physics - Quality assurance and auditing

ESTRO 2025

The on-site dosimetric audit included a calibration intercomparison of TRS-398, within 1%, lateral profiles of patient plans using an ion chamber array, and depth dose measurements with a multi-layer ion chamber, agreeing within 2 mm. Our microdosimetry validation process (Figure 2) across numerous fields and irradiation conditions confirmed the method's ability to accurately estimate RBE (within ±10% for 95% of locations).

Conclusion: Peer review audits for carbon ion radiotherapy present unique challenges. We have developed a framework to undertake credentialing for these programs. This framework parallels the existing proton therapy audit but includes novel features important to carbon ion therapy. This broad program will ensure that carbon ion radiotherapy is delivered accurately and can build a framework for multi-institution carbon trials and comparisons.

Keywords: carbon ion therapy, audit, quality assurance

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Digital Poster The Benefits of dedicated Medical Physicist time in Radiation Oncology Clinical Trials

Sandra Harkin 1,2 , James Waldron 1,2 , Roisin O Maolalai 2 , Sinead Brennan 3,2,4 , Christina Skourou 1 , Serena O'Keeffe 1 , Darina Hickey 5 , Conor McGarry 6 , Sinead Cleary 7 , Karen Molan 8 , Roisin Conaty 9 , Aisling Barry 10 , Paul Hill 11