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Abstract #0884

Variable Density Phase Encoding for High Resolution Single-Shot EPI

Mark Chiew1
1Wellcome Centre for Integrative Neuroimaging, FMRIB, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom

A new variable density phase-encoding (vdPE) scheme for single-shot EPI is presented, in which phase encoding blips scale with a decaying exponential. This serves to reshape the signal decay envelope in the PE direction, resulting in shorter achievable TEs and reduced T2* blurring, without the need for partial Fourier sampling. We demonstrate this approach in high-resolution single-shot 2D EPI data, using a virtual-coil sensitivity encoded reconstruction, and show improved image fidelity and fewer artefacts compared to conventional EPI with ¾ partial Fourier. This approach could have utility for high-resolution, high-field brain imaging for applications such as layer-specific fMRI.

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