Abstract #4019

Promising results using synthetic CT for 2D and 3D patient positioning in head and neck radiotherapy

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

¹Department of Radiation Physics, Institute of Clinical Sciences, Sahlgrenska Academy, 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, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

In an MRI-only radiotherapy workflow, in addition to enabling absorbed dose calculation the generated synthetic CT (sCT) must also be valid for patient positioning at treatment course. To evaluate MRI-only patient positioning for head and neck cancer patients, fourteen 3D cone beam CTs were retrospectively registered to CT and sCT. Further, original Digital Reconstructed radiographs originating from the CT and synthetic Digital Reconstructed radiographs originating from the sCT, were retrospectively registered to orthogonal projections. The small mean difference between the registrations showed that sCT could replace the CT for both 3D and 2D head and neck radiotherapy patient positioning.

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