Application of an integrated radio-frequency/shim coil technology for signal recovery in fMRI.

ABSTRACT:

Purpose

Gradient-echo echo-planar imaging (EPI), which is typically used for blood oxygenation level-dependent (BOLD) functional MRI (fMRI), suffers from distortions and signal loss caused by localized B₀ inhomogeneities. Such artifacts cannot be effectively corrected for with the low-order spherical harmonic (SH) shim coils available on most scanners. The integrated parallel reception, excitation, and shimming (iPRES) coil technology allows radiofrequency (RF) and direct currents to flow on each coil element, enabling imaging and localized B₀ shimming with one coil array. iPRES was previously used to correct for distortions in spin-echo EPI and is further developed here to also recover signal loss in gradient-echo EPI.

Methods

The cost function in the

SUBMITTER: Willey D 

PROVIDER: S-EPMC8568668 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature