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Abstract #5177

Absolute B1- estimation without a homogeneous receive coil

Olivia W Stanley1,2, Ravi S Menon1,2, and L Martyn Klassen2

1Department of Medical Biophysics, The University of Western Ontario, London, ON, Canada, 2Centre for Functional and Metabolic Mapping, The University of Western Ontario, London, ON, Canada

Fitting the relative B1- maps derived from a B1+ shim acquisition to the Helmholtz equations allows for the calculation of absolute B1- maps. The sensitivity profiles can then be used to optimally combine coils in subsequent acquisitions. In addition, absolute B1- maps allow for the removal of the receive sensitivity from the combined images. This was validated in a GE-EPI sequence and found to produce images with lower phase standard deviation and increased temporal signal-to-noise ratios across the brain. Both of these differences were found to be statistically significant in a Student’s t-test.

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