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Abstract #3207

A Comparison of B 1 Mapping Methods for T 1 Mapping at 3T

Mathieu Boudreau 1 , Christine Tardif 2 , Nikola Stikov 1 , and G. Bruce Pike 1,3

1 Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada, 2 Department of Neurophysics, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Saxony, Germany, 3 Hotchkiss Brain Institute, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada

B 1 maps are an essential part of most quantitative MRI protocols, including Variable Flip Angle (VFA) T 1 mapping. To achieve whole brain quantitative imaging in reasonable scan times, several novel rapid B 1 methods have been introduced. This work compared VFA T 1 maps in white matter produced with four B1 methods: Double angle, Bloch-Siegert, AFI, and double angle EPI. Six healthy adult subjects were scanned with a 3T Siemens Tim Trio MRI using a 32-channel receive-only head coil. All B 1 methods resulted in comparable WM T 1 maps, and all rapid methods strongly correlated with the reference DA map.

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