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Abstract #3299

A comparison of two B1+ mapping methods for 3D VFA T1 mapping in the liver at 3T

Gabriela Belsley1, Damian J. Tyler1, Matthew D. Robson1,2, and Elizabeth M. Tunnicliffe1
1Oxford Centre for Clinical Magnetic Resonance Research, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom, 2Perspectum, Oxford, United Kingdom

Correcting B1+ inhomogeneities is imperative in T1 mapping using a VFA 3D SPGR sequence. We compared B1+ mapping using a preconditioning RF (preRF) pulse and TurboFLASH readout against B1+ mapping using a 2D double angle method (DAM) with EPI readout. The preRF method had a residual B1+-related variation in the T1 maps of 143ms, 95% CI [135, 150] and 170ms, 95% CI [158, 181] for 2 healthy volunteers while the DAM reduced these, with B1+-related variations of -27ms, 95% CI [-33, -20] and -8ms, 95% CI [-18, 2].

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