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Abstract #1495

SAR comparison between CASL and pCASL at high magnetic field (9.4T). Evaluation of the benefit of a separate labeling coil.

Lydiane Hirschler1,2, Jérome Voiron2, Sascha Köhler2, Nora Collomb1,3, Emmanuel L. Barbier1,3, and Jan M. Warnking1,3

1Université Grenoble Alpes, Grenoble Institute of Neuroscience, Grenoble, France, 2Bruker Biospin, Ettlingen, Germany, 3Inserm, U836, Grenoble, France

Arterial Spin Labeling (ASL) is a non-invasive technique to obtain quantitative maps of perfusion. At higher magnetic fields, it benefits from both higher signal-to-noise ratio and longer T1 but could suffer from higher RF power deposition and thus temperature increase. The latter issue has however not been characterized in animals. In this study, the specific absorption rate (SAR) delivered to a rat was measured in vivo at 9.4T using continuous ASL (CASL) and pseudo-continuous ASL (pCASL) with and without a dedicated labeling coil.

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