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Single-shot diffusion trace (1)H NMR spectroscopy.

R A de Graaf1, K P Braun, K Nicolay

  • 1Department of Experimental In Vivo NMR, Image Sciences Institute, Utrecht University, Utrecht, The Netherlands.

Magnetic Resonance in Medicine
|April 27, 2001
PubMed
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This study introduces an improved single-shot technique for diffusion trace magnetic resonance spectroscopy (MRS) and imaging (MRI). It enables accurate, rotationally invariant apparent diffusion coefficient (ADC) measurements in complex tissues with a single acquisition.

Area of Science:

  • Biophysics
  • Magnetic Resonance Imaging
  • Magnetic Resonance Spectroscopy

Background:

  • Diffusion anisotropy in complex tissues complicates accurate water and metabolite diffusion measurements.
  • Traditional diffusion tensor trace measurements require multiple experiments, limiting efficiency.
  • Existing single-shot techniques need adaptation for diffusion trace MR spectroscopy.

Purpose of the Study:

  • To adapt and improve a single-shot technique for diffusion trace MR spectroscopy.
  • To achieve unambiguous and rotationally invariant apparent diffusion coefficient (ADC) values in a single acquisition.
  • To enable accurate quantitation of water and metabolite diffusion in complex biological tissues.

Main Methods:

  • Incorporation of a double spin-echo pulse sequence with four pairs of bipolar gradients.

Related Experiment Videos

  • Utilized specific gradient directions for cancellation of off-diagonal tensor elements and summation of diagonal elements.
  • Developed a pulse scheme for cross-term compensation between static magnetic field and diffusion gradients, and localization gradients.
  • Tested the sequence at 4.7 T in vivo on rat brain (MRI) and rat skeletal muscle and brain (MRS).

    • Main Results:

    • The improved single-shot technique accurately measures diffusion trace ADC values in a single acquisition.
    • Average ADC values closely agree with those obtained from the diffusion tensor trace for both water and metabolites.
    • Demonstrated significant differences in diffusion coefficients across individual orthogonal directions, highlighting the need for trace measurements.

    Conclusions:

    • The presented pulse scheme provides accurate and rotationally invariant ADC measurements for diffusion trace MRI and MRS.
    • This method overcomes limitations of multi-experiment approaches, offering efficiency in complex tissue analysis.
    • The technique is suitable for quantitative diffusion studies in various biological tissues.