Rapid measurement and correction of spatiotemporal B₀ field changes using FID navigators and a multi-channel reference image.

ABSTRACT:

Purpose

To measure spatiotemporal B₀ field changes in real time using FID navigators (FIDnavs) and to demonstrate the efficacy of retrospectively correcting high-resolution T2* -weighted images using a novel FIDnav framework.

Methods

A forward model of the complex FIDnav signals was generated by simulating the effect of changes in the underlying B₀ inhomogeneity coefficients, with spatial encoding provided by a multi-channel reference image. Experiments were performed at 3T to assess the accuracy of B₀ field estimates from FIDnavs acquired from a 64-channel head coil under different shim settings and in 5 volunteers performing deep-breathing and nose-touching tasks designed to modulate the B₀ field. Second-order, in-plane spherical

SUBMITTER: Wallace TE 

PROVIDER: S-EPMC6824939 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature