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Abstract #2185

Free-Breathing MR-based Attenuation Correction for Whole-Body PET/MR Exams

Patrick Korf1, Wolfgang Thaiss2, Ambros J. Beer2, Meinrad Beer3, Dominik Nickel1, and Thomas Vahle1
1Siemens Healthcare GmbH, Erlangen, Germany, 2Department of Nuclear Medicine, University Hospital Ulm, Ulm, Germany, 3Department of Diagnostic and Interventional Radiology, University Hospital Ulm, Ulm, Germany

In whole-body PET/MR exams, MR-based attenuation correction is usually performed with a Dixon protocol of an MR VIBE sequence acquired in breath-hold followed by a segmentation into different tissue classes. As an extension we present a free-breathing approach for attenuation correction that can be used for patients that have problems or are even unable to perform the required breath-holds. The presented approach relies on a self-gated, compressed sensing accelerated gradient-echo sequence with Cartesian k-space sampling. We demonstrate the generation of free-breathing attenuation maps in 2 human volunteers and 10 patients.

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