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Related Experiment Videos

Perfusion analysis using dynamic arterial spin labeling (DASL).

E L Barbier1, A C Silva, H J Kim

  • 1Pittsburgh NMR Center for Biomedical Research, Department of Biological Sciences, Carnegie Mellon University, Pennsylvania 15213, USA.

Magnetic Resonance in Medicine
|March 18, 1999
PubMed
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Dynamic arterial spin labeling (DASL) quantifies perfusion by analyzing tissue response to periodic labeling. This method accurately measures perfusion, transit time, and relaxation time, improving blood flow quantification.

Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Physiology

Background:

  • Magnetic resonance (MR) techniques quantify perfusion using endogenous water as a tracer.
  • Perfusion quantification relies on longitudinal relaxation time, transit time, and signal difference.
  • Existing methods face challenges in simultaneously measuring these parameters.

Purpose of the Study:

  • Introduce dynamic arterial spin labeling (DASL) for parallel measurement of perfusion parameters.
  • Develop MR schemes to efficiently measure tissue response to varying labeling functions (LF).
  • Validate DASL performance in Sprague-Dawley rats under different physiological conditions.

Main Methods:

  • Developed DASL technique analyzing tissue response to a periodic labeling function (LF).

Related Experiment Videos

  • Proposed MR schemes to measure tissue response at different LF frequencies.
  • Studied Sprague-Dawley rats using DASL with modulated LF frequencies and arterial pCO2 levels.
  • Utilized frequency filtering to isolate perfusion-related signals.

    • Main Results:

    • Measures of transit time, longitudinal relaxation time, and perfusion showed good agreement across LF frequencies.
    • DASL demonstrated effective filtering of non-perfusion-related signal changes.
    • Results were consistent with previous findings in the literature.

    Conclusions:

    • DASL enables accurate parallel quantification of perfusion, transit time, and tissue relaxation time.
    • The technique offers improved accuracy for perfusion measurement in MR studies.
    • DASL shows significant potential for advancing arterial spin labeling techniques.