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Abstract #3804

Assessment Geometric Distortion in MRI for Gynaecological Brachytherapy Planning at 3T

Maria A Schmidt1, Eva Kousi1, Georgina Hopkinson2, Anne Gasnier3, Kate Roberts3, Alexandra Taylor3, and Susan Lalondrelle3

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

MRI is increasingly used in radiotherapy treatment planning due to its superior soft tissue contrast. The growing interest in 3T MRI relates to the potential of higher signal-to-noise ratio and spatial resolution. However, geometric distortions associated with magnetic field inhomogeneity increase with field strength and may compromise geometric accuracy. We quantify the geometric distortion in MRI examinations for high dose rate brachytherapy planning for gynaecological cancer at 3T, and consider its clinical impact, taking into account the brachytherapy applicators, the subject’s susceptibility distribution and hardware-related distortions. We found localised areas of field inhomogeneity, and displacements of less than 1mm.

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