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Mechanical Control of Relaxation Using Intact Cardiac Trabeculae
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Published on: February 17, 2023

Transverse relaxometry with stimulated echo compensation.

R Marc Lebel1, Alan H Wilman

  • 1Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta, Canada. mlebel@gmail.com

Magnetic Resonance in Medicine
|June 22, 2010
PubMed
Summary
This summary is machine-generated.

A new model precisely quantifies T(2) relaxation times using multiple-refocused spin-echo MRI. It corrects for field imperfections, enhancing accuracy for transverse relaxometry in diverse imaging scenarios.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biophysics
  • Medical Physics

Background:

  • Accurate T(2) quantification is crucial for MRI-based diagnostics.
  • Existing methods struggle with transmit field (B1+) inhomogeneities and radiofrequency (RF) pulse imperfections.
  • Stimulated echoes can complicate signal decay analysis in multi-echo sequences.

Purpose of the Study:

  • To develop a robust fitting model for transverse relaxometry data acquired with the multiple-refocused spin-echo sequence.
  • To compensate for B1+ field and RF profile imperfections without additional data or sequence modifications.
  • To achieve precise monoexponential T(2) quantification even in challenging imaging conditions.

Main Methods:

  • A novel fitting model exploiting oscillatory echo behavior to estimate alternate coherence pathways.
  • Compensation for signal decay from stimulated echo pathways.
  • Numerical and experimental validation at 4.7 Tesla in phantoms and the human brain.

Main Results:

  • The model achieves over 95% accuracy in realistic imaging situations.
  • Precise monoexponential T(2) quantification is attained.
  • The method is compatible with heterogeneous transmit fields and allows thin refocusing widths for efficient multislice imaging.

Conclusions:

  • The proposed model offers accurate and robust T(2) quantification using standard multi-refocused spin-echo sequences.
  • It overcomes limitations imposed by B1+ inhomogeneities and RF imperfections.
  • This advancement facilitates efficient and reliable T(2) mapping in clinical and research MRI.