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Abstract #3805

Practical Aspects of MRI-based Gel Dosimetry in RT Quality Assurance

Evanthia Kousi1, Filipa Costa1, Rollo Moore2, Evangelos Pappas3, Anne Gasnier2, Emma Wells2, and Maria A Schmidt1

1CR-UK and EPSRC Cancer Imaging Centre, Royal Marsden NHS Foundation Trust & Institute of Cancer Research, Sutton, Surrey, United Kingdom, 2Radiotherapy, Royal Marsden NHS Foundation Trust, London, United Kingdom, 3Technological Educational Institute of Athens, Department of Radiology-Radiotherapy, Athens, Greece

MRI-based gel dosimetry has been proposed as a part of a Radiotherapy QA programme and is of interest to Stereotactic Ablative Radiotherapy and Stereotactic Radiosurgery. MRI-related sources of error that may compromise the dosimetric accuracy need to be considered. R2 measurement variations associated with measurement timing after irradiation and SAR limitations were investigated using an anthropomorphic head phantom. Our results demonstrate gradual gel deformation and R2 variations that could have an impact on relative and absolute dose measurements.

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