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Abstract #2218

Estimation and visualization of geometric fidelity using geometric offset maps for improved guidance in H&N radiation therapy

Emilia Palmér1, Maria Ljungberg1,2, Anna Karlsson1,2, Fredrik Nordström1,2, Karin Petruson3, and Maja Sohlin1,2
1Department of Radiation Physics, Institute of Clinical Sciences, University of Gothenburg, Gothenburg, Sweden, 2Department of Medical Physics and Biomedical Engineering, Sahlgrenska University Hospital, Gothenburg, Sweden, 3Department of Oncology and Radiotherapy, Institute of Clinical Sciences, University of Gothenburg, Gothenburg, Sweden


In an MRI-only workflow, high geometric fidelity of the MRI data is required. Head and neck (H&N) cancer patients, however, frequently have implants, e.g., dental restorations, causing distortions of the MRI data. Geometric offset maps were computed using B0-map calculated from the Dixon-sequence included in the standard clinical protocol. Even though the implants included in this pre-study did not contribute with a significant geometric offset in the delineated target volume, visualization of the geometric offset maps as such bring additional important information when delineating structures in an MRI-only H&N workflow and could thereby become a promising tool in clinical practice.

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