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Anatomical brain imaging at 7T using two-dimensional GRASE.

Robert Trampel1, Enrico Reimer, Laurentius Huber

  • 1Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.

Magnetic Resonance in Medicine
|January 21, 2014
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Summary
This summary is machine-generated.

Gradient and spin echo (GRASE) imaging offers a faster alternative to turbo spin echo (TSE) for high-field MRI. GRASE provides comparable image quality and contrast while significantly reducing scan times, making it suitable for ultra-high field strengths.

Keywords:
7 TeslaGRASESARbrainhigh resolutionstructural imaging

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Area of Science:

  • Radiology
  • Magnetic Resonance Imaging
  • Medical Physics

Background:

  • Specific absorption rate (SAR) is a critical challenge in high-field MRI, particularly for sequences like turbo spin echo (TSE) that utilize numerous high-power radiofrequency pulses.
  • Gradient and spin echo (GRASE) is a novel imaging technique designed to mitigate SAR issues by replacing some TSE refocusing pulses with segmented echo-planar imaging readouts.

Purpose of the Study:

  • To compare the performance of GRASE and TSE sequences at 7 Tesla (7T) magnetic field strength.
  • To evaluate image quality metrics including signal-to-noise ratio (SNR) per unit time, contrast, and point spread function (PSF).
  • To assess the feasibility of T(1)-weighted imaging using inversion recovery preparation with the GRASE sequence.

Main Methods:

  • Acquisition of high-resolution human brain images using both GRASE and TSE sequences with comparable parameters at 7T.
  • Quantitative analysis of SNR, contrast, and PSF for both imaging techniques.
  • Evaluation of T(1)-weighted imaging capabilities with inversion recovery preparation in GRASE.

Main Results:

  • GRASE and TSE sequences demonstrated similar SNR and contrast at 7T.
  • GRASE exhibited a slightly inferior PSF but offered substantial reductions in scan time or increased spatial coverage compared to TSE.
  • Successful implementation of inversion recovery preparation allowed for high SNR T(1)-weighted imaging with GRASE.

Conclusions:

  • GRASE is a highly suitable sequence for structural MRI at ultra-high field strengths.
  • GRASE presents a viable and advantageous alternative to conventional TSE sequences for high-field applications.