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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