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MRI gradient fields increase brain mannitol space.

H J Garber1, W H Oldendorf, L D Braun

  • 1Department of Psychiatry, UCLA School of Medicine.

Magnetic Resonance Imaging
|November 1, 1989
PubMed
Summary
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Magnetic resonance imaging (MRI) at lower field strengths (0.3 T and 0.5 T) increased mannitol in rat brains, suggesting potential effects on blood-brain barrier permeability. Higher field strengths (1.5 T) showed no significant impact.

Area of Science:

  • Neuroimaging
  • Biophysics
  • Physiology

Background:

  • The blood-brain barrier (BBB) protects the central nervous system but limits drug delivery.
  • Magnetic Resonance Imaging (MRI) is a widely used diagnostic tool with varying magnetic field strengths.
  • Previous studies suggest potential biological effects of MRI, necessitating further investigation.

Purpose of the Study:

  • To investigate the effect of different magnetic resonance imaging (MRI) field strengths on blood-brain barrier (BBB) permeability in rats.
  • To determine which components of the MRI procedure (static field, gradient fields, or radiofrequency pulses) influence BBB integrity.

Main Methods:

  • Adult male rats underwent nephrectomy and received intravenous tritiated mannitol.
  • Rats were exposed to MRI at 1.5 T, 0.5 T, and 0.3 T, with control groups.

Related Experiment Videos

  • Brain mannitol concentration was measured and compared between exposed and control groups.

    • Main Results:

    • Brain mannitol concentration significantly increased at 0.3 T and 0.5 T MRI exposure compared to controls.
    • No significant increase in brain mannitol was observed at 1.5 T MRI.
    • At 0.3 T, gradient-field fluctuations, not static fields or radiofrequency pulses, were associated with increased brain mannitol.

    Conclusions:

    • Lower field strength MRI (0.3 T, 0.5 T) may increase blood-brain barrier permeability or blood volume in the brain.
    • The observed effects are primarily linked to gradient-field fluctuations during the MRI procedure.
    • The clinical significance of these MRI-induced changes in mannitol distribution requires further research.