Abstract #1449

Evaluating the Benefit of Parallel Transmission on tSNR in 3D-EPI-based fMRI at 7 Tesla

Yidi Lu¹, Chia-Yin Wu^1,2,3, Jin Jin^2,3,4, David Reutens^1,2, and Martijn Cloos^1,2,5

¹Centre for Advanced Imaging, The University of Queensland, Brisbane, Australia, ²ARC Training Centre for Innovation in Biomedical Imaging Technology, The University of Queensland, Brisbane, Australia, ³School of Electrical Engineering and Computer Science, The University of Queensland, Brisbane, Australia, ⁴Siemens Healthineers Pty Ltd, Brisbane, Australia, ⁵Donders Centre for Cognitive Neuroimaging, Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, Netherlands

Synopsis

Keywords: fMRI Acquisition, fMRI Acquisition, 3D-EPI, tSNR, pTx, B1+ artifact, 7T, UHF

Motivation: Parallel transmission has been shown to improve the temporal SNR in fMRI studies at 7T when using 2D-EPI, while the benefits are less clear with 3D-EPI.

Goal(s): To study the tSNR benefit of pTx in fMRI studies that use 3D-EPI at 7T.

Approach: We compared both the modelled (t)SNR (based on the measured B₁⁺) and the measured tSNR in a 3D-EPI functional scan at 7T between CP and pTx.

Results: The (t)SNR of 3D-EPI is relatively B₁⁺ robust. Consequently, pTx provided trivial benefits in most brain regions (<=4% in mean tSNR) except in B₁⁺ starved areas such as the cerebellum.

Impact: In the brain, at 7T, the (t)SNR of 3D-EPI is relatively B₁⁺ robust, resulting in trivial tSNR benefit with pTx. The benefits only become impactful when multiple brain regions, including B₁⁺starved areas like the cerebellum, are of interest.

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