Abstract #2088

On the influence of susceptibility-related field inhomogeneities caused by intestinal gases on the distortion in prostate and cervix

Julian Emmerich¹, Rebecca Schilling², Sina Straub¹, Asja Pfaffenberger³, and Frederik Bernd Laun^1,4

¹Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, ²Medical Faculty, University Hospital Ulm, Ulm, Germany, ³Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany, ⁴Institute of Radiology, University Hospital Erlangen, Erlangen, Germany

Due to field inhomogeneities, MR-images suffer from image distortions in frequency-encoding direction. Using MRI as a tool for dose planning in MR-guided radiation therapy, image distortions play an important role in defining safety margins and the planning target volume (PTV). To investigate the influence of susceptibility-related field inhomogeneities on the distortion in prostate and cervix, distortions maps based on phase images were calculated for data acquired in a MR-guidance study. It was found that maximum distortions in prostate and rectum can be as large as 0.6 mm or 1.0 mm respectively, which should be considered when defining PTVs.

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