Abstract #1336

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

Mark Oehmigen¹, Marcel Gratz^1,2, Verena Ruhlmann³, Lale Umutlu⁴, Matthias Fenchel⁵, Jan Ole Blumhagen⁵, and Harald H. Quick^1,2

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 SUV_max 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 SUV_max 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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