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Diffusion imaging with paired CPMG sequences.

R V Mulkern1, R G Spencer

  • 1Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115.

Magnetic Resonance Imaging
|November 1, 1988
PubMed
Summary
This summary is machine-generated.

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This study introduces a new method for mapping diffusion coefficients using interleaved Carr-Purcell-Meiboom-Gill (CPMG) sequences. The technique accurately measures T2 and apparent proton self-diffusion coefficients.

Area of Science:

  • Magnetic Resonance Imaging
  • Diffusion MRI

Background:

  • Accurate measurement of diffusion coefficients is crucial in Magnetic Resonance Imaging (MRI).
  • Traditional methods face challenges with out-of-slice signal contributions.
  • Carr-Purcell-Meiboom-Gill (CPMG) sequences are sensitive to diffusion.

Purpose of the Study:

  • To develop and validate a novel method for mapping apparent diffusion coefficients.
  • To improve the accuracy of diffusion MRI by minimizing artifacts.
  • To enable precise evaluation of T2 and apparent proton self-diffusion coefficients.

Main Methods:

  • Utilized two interleaved CPMG sequences for diffusion mapping.
  • Implemented image slice selection prior to each sequence.
  • Employed non-selective "hard" refocusing pulses.

Related Experiment Videos

  • Applied phase cycling of slice-selection for each projection to reduce out-of-slice contributions.

    • Main Results:

    • The proposed method allows for accurate mapping of apparent diffusion coefficients.
    • Minimized out-of-slice contributions to echo amplitudes.
    • Enabled precise evaluation of both T2 and apparent proton self-diffusion coefficients.

    Conclusions:

    • The developed technique offers an accurate approach for diffusion MRI.
    • This method enhances the reliability of T2 and diffusion coefficient measurements.
    • The findings have implications for quantitative MRI applications.