Quiet echo planar imaging for functional and diffusion MRI.

ABSTRACT:

Purpose

To develop a purpose-built quiet echo planar imaging capability for fetal functional and diffusion scans, for which acoustic considerations often compromise efficiency and resolution as well as angular/temporal coverage.

Methods

The gradient waveforms in multiband-accelerated single-shot echo planar imaging sequences have been redesigned to minimize spectral content. This includes a sinusoidal read-out with a single fundamental frequency, a constant phase encoding gradient, overlapping smoothed CAIPIRINHA blips, and a novel strategy to merge the crushers in diffusion MRI. These changes are then tuned in conjunction with the gradient system frequency response function.

Results

Maintained image quality, SNR, and quantitative diffusion values while reducing acous

SUBMITTER: Hutter J 

PROVIDER: S-EPMC5836719 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature