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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
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Compressed sensing reconstruction improves sensitivity of variable density spiral fMRI.

D J Holland1, C Liu, X Song

  • 1Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK.

Magnetic Resonance in Medicine
|February 8, 2013
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Summary

Compressed sensing (CS) reconstruction enhances functional MRI (fMRI) sensitivity. Variable density (VD) spiral fMRI with CS at 28% under-sampling achieves sensitivity comparable to conventional 2-shot methods but with single-shot acquisition.

Keywords:
compressed sensingfMRIspiralvariable-density

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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging

Background:

  • Functional MRI (fMRI) is crucial for brain activity studies.
  • Demand exists for fMRI techniques with high contrast, rapid imaging, and minimal distortion.

Purpose of the Study:

  • To investigate if compressed sensing (CS) reconstruction can improve fMRI sensitivity.
  • To evaluate CS reconstruction of variable density (VD) spiral fMRI.

Main Methods:

  • Compared three CS-reconstructed 1-shot VD spirals (28%, 35%, 46% under-sampling) with conventional 1-shot and 2-shot Archimedean spirals.
  • Assessed fMRI map sensitivity with and without CS reconstruction using matched voxels.

Main Results:

  • CS reconstruction increased functional contrast only at 28% under-sampling.
  • 2-shot uniformly sampled spiral and 28% under-sampled VD spiral data reconstructed with CS showed equivalent sensitivity.

Conclusions:

  • VD spiral fMRI with CS reconstruction offers improved sensitivity in the 25-30% under-sampling range.
  • CS enables VD acquisitions to match the sensitivity of 2-shot Archimedean acquisitions using only a single shot.