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Serial postmortem relaxometry in the normal rat brain and following stroke.

Andrew J Fagan1, Jim M Mullin, Lindsay Gallagher

  • 1Department of Medical Physics and Bioengineering, St James's Hospital, Dublin 8, Ireland. andrew.fagan@tcd.ie

Journal of Magnetic Resonance Imaging : JMRI
|January 26, 2008
PubMed
Summary

Magnetic resonance imaging (MRI) shows changes in rat brain relaxation parameters after death. Postmortem interval affects MRI

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Area of Science:

  • Neuroimaging
  • Postmortem Analysis
  • Biophysics

Background:

  • Magnetic Resonance Imaging (MRI) is a powerful tool for in vivo tissue characterization.
  • Understanding postmortem changes in MRI relaxation parameters is crucial for its application in noninvasive autopsy and forensic investigations.

Purpose of the Study:

  • To investigate the utility of MRI for noninvasive autopsy by measuring serial changes in rat brain relaxation parameters (T1 and T2) over a 24-hour postmortem interval.
  • To assess the impact of ischemic stroke on these postmortem MRI changes.

Main Methods:

  • Postmortem MRI relaxometry measurements were conducted hourly for 24 hours on control rats and rats that experienced middle cerebral artery occlusion.
  • Analyses focused on representative regions of gray matter, white matter, and mixed gray/white matter structures.

Main Results:

  • Significant decreases in both T1 and T2 relaxation values were observed in all brain areas of control rats within 24 hours postmortem.
  • In stroke models, T2 differences between ischemic and normal brain tissue diminished, leading to convergence of T2 values.

Conclusions:

  • The postmortem interval significantly impacts lesion conspicuity and tissue differentiation in MRI.
  • Adjustments to MRI pulse timing parameters are necessary to maintain sensitivity for detecting central nervous system diseases in postmortem tissues.
  • T1-weighted imaging may offer greater sensitivity for detecting postmortem stroke lesions due to T2 value convergence.