Abstract #5177

Absolute B1- estimation without a homogeneous receive coil

Olivia W Stanley^1,2, Ravi S Menon^1,2, 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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