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Abstract #1336

Impact of new attenuation correction methods on whole-body PET/MR

Mark Oehmigen1, Marcel Gratz1,2, Verena Ruhlmann3, Lale Umutlu4, Matthias Fenchel5, Jan Ole Blumhagen5, and Harald H. Quick1,2

1High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany, 2Erwin L. Hahn Institute for MR Imaging, University Duisburg-Essen, 3Department of Nuclear Medicine, University Hospital Essen, 4Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, 5Siemens Heathineers, Siemens AG, Erlangen, Germany

Recent developments in MR-based whole-body PET/MR attenuation correction allow for adding bone information and for eliminating truncation artefacts along the patients’ arms using the HUGE technique. 43 patients underwent a PET/MR whole-body examination. The PET SUVmax of 57 active lesions were measured for PET data reconstructed with four different µmaps: standard, standard+bone, standard+HUGE, and standard+bone+HUGE. Compared to the standard-µmap, the mean SUVmax of all 57 lesions increases by 14%±12% when adding bone, by 17%±12% when adding HUGE, and by 24%±19% when adding bone+HUGE. These results are an important step towards improved MR-based attenuation correction in whole-body PET/MR hybrid imaging.

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