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Fast Hadamard-Encoded 7T Spectroscopic Imaging of Human Brain.

Chan Hong Moon1, Frank S Lieberman2, Hoby P Hetherington3

  • 1MR Research Center, Department of Radiology, University of Pittsburgh, 200 Lothrop Street, Pittsburgh, PA 15213, USA.

Tomography (Ann Arbor, Mich.)
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Summary

This study demonstrates that fast multi-slice spectroscopic imaging at 7T using a Hadamard slice encoding and 2D rosette trajectory achieves accuracy comparable to conventional methods, offering rapid and well-tolerated clinical applications.

Keywords:
7THadamard slice encodingfast spectroscopic imagingrosette trajectorytumor

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Area of Science:

  • Magnetic Resonance Imaging
  • Spectroscopic Imaging
  • High-Field MRI

Background:

  • High signal-to-noise ratio (SNR) at 7 Tesla (7T) enables accelerated spectroscopic imaging.
  • Fast readout trajectories are crucial for clinical applications of advanced MRI techniques.

Purpose of the Study:

  • Evaluate a Hadamard slice encoding strategy with a 2D rosette trajectory for multi-slice fast spectroscopic imaging at 7T.
  • Assess the performance of this technique for both singlet and coupled spin systems.

Main Methods:

  • Utilized moderate-TE spin echo and J-refocused polarization transfer sequences.
  • Implemented simultaneous Hadamard multi-slice excitations and rosette in-plane encoding.
  • Modified Hadamard encoding to reduce RF pulse amplitude for J-refocused acquisitions.

Main Results:

  • Multi-slice and single-slice rosette spectroscopic imaging (RSI) accuracy is comparable to conventional Cartesian-encoded spectroscopic imaging (CSI).
  • Spectral analyses showed no significant difference in Cramer Rao lower bounds between fast RSI and conventional CSI for glutamate and myo-inositol.
  • Linear regressions with gray matter content aligned with literature values.

Conclusions:

  • Fast RSI acquisitions (2.2-9 min) are well-tolerated in healthy subjects and tumor patients.
  • The technique offers minimal gradient demands and fast acquisition times.
  • Results are consistent with clinical outcomes, demonstrating potential for clinical translation.