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Related Experiment Videos

Imaging local cerebral blood flow by Xenon-enhanced computed tomography--technical optimization procedures.

J S Meyer1, T Shinohara, A Imai

  • 1Cerebral Blood Flow Laboratory, Veterans Administration Medical Center, Houston, Texas.

Neuroradiology
|January 1, 1988
PubMed
Summary

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This study introduces a non-invasive method using Xenon-enhanced CT (XeCT) to accurately measure local cerebral blood flow (LCBF). Optimized scanning protocols and in vivo partition coefficients improve precision for brain imaging.

Area of Science:

  • Neuroimaging
  • Radiology
  • Medical Physics

Background:

  • Accurate measurement of local cerebral blood flow (LCBF) is crucial for diagnosing and monitoring neurological conditions.
  • Previous methods using Xenon-enhanced computed tomography (XeCT) often relied on assumed normal partition coefficients, risking systematic errors.
  • Individual variations in brain-blood partition coefficients (Lλ) can be altered by disease, necessitating in vivo measurements.

Purpose of the Study:

  • To describe a non-invasive, computer-assisted serial scanning method for measuring LCBF using Xenon gas inhalation.
  • To optimize XeCT protocols for enhanced accuracy and spatial resolution in brain imaging.
  • To correlate functional blood flow data with anatomical and pathological observations.

Main Methods:

Related Experiment Videos

  • Utilized optimized XeCT with 5-second scans at one-minute intervals during 8 minutes of 27%-30% Xenon inhalation.
  • Employed rapid Xenon delivery via a face mask and state-of-the-art CT scanners.
  • Measured in vivo local brain-blood partition coefficients (Lλ) to calculate LCBF, avoiding assumptions of normality.

    • Main Results:

    • Achieved accurate, non-invasive measurement of LCBF with high spatial resolution (26.5 cubic mm).
    • Generated color-coded maps of Lλ and LCBF directly onto CT images for functional-anatomic correlation.
    • Reported mean cortical gray matter blood flow of 46.3 ± 7.7, subcortical gray matter of 50.3 ± 13.2, and white matter of 18.8 ± 3.2 in normal volunteers.

    Conclusions:

    • The described XeCT method provides a safe, useful, and non-invasive approach for assessing LCBF.
    • Modern CT scanner stability and rapid Xenon saturation enhance the correlation of functional imaging with brain structure.
    • This technique allows for precise functional brain imaging, aiding in the evaluation of both normal and abnormal brain states.