Accelerating functional MRI using fixed-rank approximations and radial-cartesian sampling.

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Mark ChiewKarla L Miller

Abstract

Recently, k-t FASTER (fMRI Accelerated in Space-time by means of Truncation of Effective Rank) was introduced for rank-constrained acceleration of fMRI data acquisition. Here we demonstrate improvements achieved through a hybrid three-dimensional radial-Cartesian sampling approach that allows posthoc selection of acceleration factors, as well as incorporation of coil sensitivity encoding in the reconstruction. The multicoil rank-constrained reconstruction used hard thresholding and shrinkage on matrix singular values of the space-time data matrix, using sensitivity encoding and the nonuniform Fast Fourier Transform to enforce data consistency in the multicoil non-Cartesian k-t domain. Variable acceleration factors were made possible using a radial increment based on the golden ratio. Both retrospective and prospectively under-sampled data were used to assess the fidelity of the enhancements to the k-t FASTER technique in resting and task-fMRI data. The improved k-t FASTER is capable of tailoring acceleration factors for recovery of different signal components, achieving up to R = 12.5 acceleration in visual-motor task data. The enhancements reduce data matrix reconstruction errors even at much higher acceleration factors when c...Continue Reading

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Citations

Aug 26, 2017·Medical & Biological Engineering & Computing·Saideh Ferdowsi, Vahid Abolghasemi
Aug 15, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Florian WiesingerAna Beatriz Solana
Sep 9, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Nadine N GraedelKarla L Miller
Sep 26, 2017·Medical Physics·Lior WeizmanMark Chiew
Sep 9, 2020·Magnetic Resonance Imaging·Vahid MalekianAbbas Nasiraei-Moghaddam
Aug 20, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Christoph A RettenmeierV Andrew Stenger

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Methods Mentioned

BETA
imaging techniques
PCA

Software Mentioned

NUFFT
FEAT
MELODIC
ICA
FASTER
GRAPPA
CAIPIRINHA
FEAT GLM
SENSE

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