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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Spectrally selective B1-insensitive T2 magnetization preparation sequence.

Reza Nezafat1, Ronald Ouwerkerk, Andrew J Derbyshire

  • 1Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA. rnezafat@bidmc.harvard.edu

Magnetic Resonance in Medicine
|March 26, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a new T(2) preparation sequence for MRI that is robust to magnetic field variations and suppresses fat signal without increasing specific absorption rate (SAR). The technique improves image quality in high magnetic field strength scans.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Physics

Background:

  • B(1) field inhomogeneity increases with higher magnetic field strengths (≥3T), impacting MRI sequence performance.
  • Existing T(2) preparation sequences can be sensitive to B(1) variations, necessitating more robust methods.

Purpose of the Study:

  • To develop a T(2) magnetization-preparation (T(2) Prep) sequence insensitive to B(1) field variations.
  • To achieve simultaneous fat suppression without increasing specific absorption rate (SAR).

Main Methods:

  • A segmented B(1)-insensitive rotation (BIR-4) adiabatic pulse was modified by incorporating two delay segments.
  • T(2) weighting was achieved using adiabatic pulses, with fat suppression enabled by prolonging the second delay for chemical shift-induced phase accumulation.
  • The sequence's efficacy was validated through numerical simulations, phantom studies, and in vivo imaging.

Main Results:

  • The proposed T(2) Prep sequence demonstrates insensitivity to B(1) field variations, providing reliable T(2) weighting.
  • Simultaneous fat suppression was achieved by exploiting the chemical shift of fat protons.
  • The method showed efficacy in phantom and in vivo imaging, confirming its practical applicability.

Conclusions:

  • The novel T(2) Prep sequence offers a robust solution for MRI at higher field strengths.
  • It effectively achieves T(2) weighting and fat suppression with improved B(1) insensitivity and no increased SAR.
  • This technique has the potential to enhance diagnostic accuracy in clinical MRI.