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High resolution single-shot EPI at 7T.

Oliver Speck1, J Stadler, M Zaitsev

  • 1Department of Biomedical Magnetic Resonance, Faculty of Natural Sciences/Institute for Experimental Physics, Otto-von-Guericke-University Magdeburg, Leipziger Str. 44, Haus 01, 39120 Magdeburg, Germany. oliver.speck@nat.uni-magdeburg.de

Magma (New York, N.Y.)
|November 2, 2007
PubMed
Summary

High-resolution whole-brain functional neuroimaging using single-shot echo planar imaging (EPI) at 7 Tesla is now feasible. This advanced technique minimizes distortions and signal loss for clearer brain activity mapping.

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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging (MRI)

Background:

  • Acquiring high-resolution single-shot echo planar imaging (EPI) at 7 Tesla (7T) presents significant challenges.
  • These challenges include increased geometric distortions, signal dropouts, high radiofrequency (RF) power deposition, and reduced T2* signal.

Purpose of the Study:

  • To develop and validate pulse sequence and protocol modifications for high-resolution whole-brain functional neuroimaging using single-shot EPI at 7T.
  • To overcome the inherent limitations of EPI at ultra-high field strengths.

Main Methods:

  • Implemented geometric distortion correction, modified fat saturation techniques, and parallel imaging.
  • Acquired gradient-echo EPI data at 7T with varying spatial resolutions.
  • Quantified Blood-Oxygen-Level-Dependent (BOLD) sensitivity in a breath-hold experiment.

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Main Results:

  • Achieved single-shot EPI with isotropic resolutions ranging from 3 mm down to 1.1 mm in human subjects.
  • Reduced RF power deposition, enabling faster imaging (up to 22 slices/sec) and decreased acoustic noise and helium boil-off.
  • Optimized fat saturation for up to 20% signal gain without sacrificing fat suppression quality.
  • Identified optimal BOLD sensitivity at 2 mm or 1.4 mm isotropic resolution for the tested coil.

Conclusions:

  • Demonstrated the feasibility of high-resolution whole-brain single-shot EPI at 7T.
  • The developed methods result in high efficiency, minimal signal dropout, and negligible geometric distortions.