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Diffusion/microcirculation MRI in the rat brain.

J R MacFall1, J H Maki, G A Johnson

  • 1Duke University Medical Center, Department of Radiology, Durham, North Carolina 27710.

Magnetic Resonance in Medicine
|June 1, 1991
PubMed
Summary
This summary is machine-generated.

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Changes in carbon dioxide levels in anesthetized rats did not alter brain microcirculation diffusion measurements. Additional diffusion components observed may be due to cerebrospinal fluid (CSF) rather than blood flow changes.

Area of Science:

  • Neuroscience
  • Physiology
  • Medical Imaging

Background:

  • Brain microcirculation is crucial for neural tissue function.
  • Carbon dioxide (CO2) levels can influence cerebral blood flow.
  • Diffusion MRI is a technique used to measure water molecule movement in tissues.

Purpose of the Study:

  • To investigate the effect of varying CO2 fractions on brain microcirculation in anesthetized rats.
  • To observe changes in neural tissue diffusion measurements under different CO2 concentrations.
  • To explore the origin of multiple diffusion components observed in brain tissue.

Main Methods:

  • Anesthetized rats were subjected to breathing mixtures with CO2 fractions ranging from 0 to 10%.
  • Apparent diffusion coefficients (ADCs) in brain tissue were measured using diffusion MRI.

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  • Diffusion measurements were taken both before and after the sacrifice of the animals.

    • Main Results:

    • Brain ADCs were measured at (0.71 ± 0.01) x 10⁻³ mm²/s before sacrifice and (0.39 ± 0.01) x 10⁻³ mm²/s after sacrifice.
    • Multiple diffusion components were detected, suggesting the presence of flowing material.
    • Increased CO2 levels did not lead to an increase in these extra diffusion components.

    Conclusions:

    • The observed diffusion components in brain tissue may originate from extracellular, extravascular water, such as cerebrospinal fluid (CSF).
    • CO2-induced changes in cerebral blood flow did not significantly impact the measured diffusion parameters in this study.
    • Further research is needed to fully elucidate the contribution of CSF to diffusion MRI signals in neural tissues.