Abstract #1495

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

Lydiane Hirschler^1,2, Jérome Voiron², Sascha Köhler², Nora Collomb^1,3, Emmanuel L. Barbier^1,3, and Jan M. Warnking^1,3

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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