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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
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Updated: Jul 12, 2025

Magnetic Resonance Imaging Quantification of Pulmonary Perfusion using Calibrated Arterial Spin Labeling
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ASL lexicon and reporting recommendations: A consensus report from the ISMRM Open Science Initiative for Perfusion

Yuriko Suzuki1, Patricia Clement2,3, Weiying Dai4

  • 1Wellcome Centre for Integrative Neuroimaging, FMRIB, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK.

Magnetic Resonance in Medicine
|October 25, 2023
PubMed
Summary

A new ASL lexicon standardizes terminology for arterial spin labeling (ASL) perfusion MRI. This aims to improve consistency and reproducibility in brain imaging research across different methods and sites.

Keywords:
arterial spin labelinginteroperabilitynoninvasiveperfusion imagingreproducibility

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Area of Science:

  • Medical Imaging
  • Neuroscience
  • Radiology

Background:

  • The 2015 ISMRM consensus statement promoted arterial spin labeling (ASL) perfusion MRI implementation.
  • Rapid ASL development has led to diverse terminology, potentially hindering research reproducibility.

Purpose of the Study:

  • To develop standardized nomenclature and reporting recommendations for ASL perfusion imaging.
  • To create a community-endorsed lexicon for ASL techniques and parameters.

Main Methods:

  • Development of an ASL Lexicon and Reporting Recommendations by the ISMRM Perfusion Study Group's ASL Lexicon Task Force.
  • Inclusion of sequences and parameters for continuous, pulsed, velocity-selective, and multi-timepoint ASL for brain perfusion imaging.

Main Results:

  • The paper introduces a foundational ASL lexicon covering various ASL techniques.
  • It provides recommendations for imaging parameters to be included in scientific reports.

Conclusions:

  • Standardized ASL terminology is crucial for consistent clinical implementation and reproducible research.
  • The ASL lexicon serves as a foundation for a continuously updated online inventory.