Abstract #2218

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

Emilia Palmér¹, Maria Ljungberg^1,2, Anna Karlsson^1,2, Fredrik Nordström^1,2, Karin Petruson³, and Maja Sohlin^1,2

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

Synopsis

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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