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Velocity-selective arterial spin labeling.

Eric C Wong1, Matthew Cronin, Wen-Chau Wu

  • 1Department of Radiology, University of California-San Diego, La Jolla, 92093, USA. ecwong@ucsd.edu

Magnetic Resonance in Medicine
|May 16, 2006
PubMed
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Velocity-selective arterial spin labeling (VSASL) offers accurate cerebral blood flow (CBF) measurement in conditions with slow or collateral blood flow, overcoming limitations of conventional methods.

Area of Science:

  • Neuroimaging
  • Medical Physics
  • Biomedical Engineering

Background:

  • Conventional arterial spin labeling (ASL) methods struggle with accurate cerebral blood flow (CBF) quantification in pathologies with slow or collateral flow due to transit delays exceeding tag relaxation times.
  • These limitations hinder reliable assessment of brain perfusion in critical conditions.

Purpose of the Study:

  • To introduce and detail velocity-selective ASL (VSASL) as a robust technique for quantitative CBF measurement.
  • To address the challenges of implementing VSASL for improved accuracy in slow and collateral flow scenarios.

Main Methods:

  • Description of a robust multislice VSASL technique, focusing on velocity-selective pulse design and background suppression.
  • Comparison of VSASL data with conventional pulsed ASL (PASL) to evaluate performance.

Related Experiment Videos

  • Discussion of technical considerations including anisotropy and CBF quantitation.

    • Main Results:

    • VSASL provides quantitative CBF measures under slow and collateral flow conditions where conventional ASL fails.
    • The implemented multislice VSASL technique demonstrates robustness and improved accuracy.

    Conclusions:

    • VSASL is a promising technique for accurate CBF quantification, particularly in complex hemodynamic conditions.
    • Further technical refinements in VSASL can enhance its clinical applicability for neurological pathologies.