Dynamic distortion correction for functional MRI using FID navigators.

Details

Serval ID
serval:BIB_CBAFBDDF1BDF
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Dynamic distortion correction for functional MRI using FID navigators.
Journal
Magnetic resonance in medicine
Author(s)
Wallace T.E., Polimeni J.R., Stockmann J.P., Hoge W.S., Kober T., Warfield S.K., Afacan O.
ISSN
1522-2594 (Electronic)
ISSN-L
0740-3194
Publication state
Published
Issued date
03/2021
Peer-reviewed
Oui
Volume
85
Number
3
Pages
1294-1307
Language
english
Notes
Publication types: Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
To develop a method for slice-wise dynamic distortion correction for EPI using rapid spatiotemporal B <sub>0</sub> field measurements from FID navigators (FIDnavs) and to evaluate the efficacy of this new approach relative to an established data-driven technique.
A low-resolution reference image was used to create a forward model of FIDnav signal changes to enable estimation of spatiotemporal B <sub>0</sub> inhomogeneity variations up to second order from measured FIDnavs. Five volunteers were scanned at 3 T using a 64-channel coil with FID-navigated EPI. The accuracy of voxel shift measurements and geometric distortion correction was assessed for experimentally induced magnetic field perturbations. The temporal SNR was evaluated in EPI time-series acquired at rest and with a continuous nose-touching action, before and after image realignment.
Field inhomogeneity coefficients and voxel shift maps measured using FIDnavs were in excellent agreement with multi-echo EPI measurements. The FID-navigated distortion correction accurately corrected image geometry in the presence of induced magnetic field perturbations, outperforming the data-driven approach in regions with large field offsets. In functional MRI scans with nose touching, FIDnav-based correction yielded temporal SNR gains of 30% in gray matter. Following image realignment, which accounted for global image shifts, temporal SNR gains of 3% were achieved.
Our proposed application of FIDnavs enables slice-wise dynamic distortion correction with high temporal efficiency. We achieved improved signal stability by leveraging the encoding information from multichannel coils. This approach can be easily adapted to other EPI-based sequences to improve temporal SNR for a variety of clinical and research applications.
Keywords
Algorithms, Artifacts, Brain/diagnostic imaging, Echo-Planar Imaging, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Imaging, B0 inhomogeneity, EPI artifacts, FID navigators, dynamic distortion correction, field map, functional MRI
Pubmed
Web of science
Create date
05/10/2020 14:45
Last modification date
30/12/2023 7:07
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