Pushing functional MRI spatial and temporal resolution further: High-density receive arrays combined with shot-selective 2D CAIPIRINHA for 3D echo-planar imaging at 7 T.

NMR in Biomedicine
Arjan D HendriksNatalia Petridou

Abstract

To be able to examine dynamic and detailed brain functions, the spatial and temporal resolution of 7 T MRI needs to improve. In this study, it was investigated whether submillimeter multishot 3D EPI fMRI scans, acquired with high-density receive arrays, can benefit from a 2D CAIPIRINHA sampling pattern, in terms of noise amplification (g-factor), temporal SNR and fMRI sensitivity. High-density receive arrays were combined with a shot-selective 2D CAIPIRINHA implementation for multishot 3D EPI sequences at 7 T. In this implementation, in contrast to conventional inclusion of extra kz gradient blips, specific EPI shots are left out to create a CAIPIRINHA shift and reduction of scan time. First, the implementation of the CAIPIRINHA sequence was evaluated with a standard receive setup by acquiring submillimeter whole brain T2 *-weighted anatomy images. Second, the CAIPIRINHA sequence was combined with high-density receive arrays to push the temporal resolution of submillimeter 3D EPI fMRI scans of the visual cortex. Results show that the shot-selective 2D CAIPIRINHA sequence enables a reduction in scan time for 0.5 mm isotropic 3D EPI T2 *-weighted anatomy scans by a factor of 4 compared with earlier reports. The use of the 2D CAIP...Continue Reading

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Citations

Sep 17, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Rüdiger Stirnberg, Tony Stöcker
Feb 11, 2021·NMR in Biomedicine·Mark GosselinkDennis W J Klomp
Jun 22, 2021·Frontiers in Psychiatry·Stefan FrässleKlaas E Stephan
Jul 8, 2021·NMR in Biomedicine·Nikos PriovoulosWietske van der Zwaag
Aug 17, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Maria EngelKlaas P Pruessmann
Sep 4, 2021·NeuroImage·Luisa RaimondoWietske van der Zwaag
Nov 6, 2021·Hippocampus·Tom Willems, Katharina Henke

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Methods Mentioned

BETA
imaging techniques

Software Mentioned

SENSE
GRAPPA
CAIPIRINHA
AFNI

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