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Postmortem imaging and neuropathologic correlations.

Jean C Augustinack1, André J W van der Kouwe1

  • 1Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, USA.

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Summary

Postmortem imaging provides ultra-high-resolution brain scans for detailed mapping, validating magnetic resonance imaging (MRI) properties against histology. This technique enhances understanding of brain structures, particularly in neuropathologic studies.

Keywords:
MRIcortical localizationentorhinal cortexex vivohippocampushistologypathologyperirhinal cortexsubfieldssubregions

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Area of Science:

  • Neuroimaging
  • Histology
  • Neuropathology

Background:

  • Standard in vivo MRI has limited resolution for detailed cortical boundary delineation.
  • Postmortem imaging offers a solution for obtaining ultra-high-resolution images.
  • This technique allows for validation of MRI properties against histologic sections.

Purpose of the Study:

  • To summarize postmortem imaging techniques and their utility in brain mapping.
  • To highlight the advantages of postmortem imaging for achieving high-resolution cortical delineation.
  • To discuss the application of postmortem imaging in neuropathologic studies, focusing on the medial temporal lobe.

Main Methods:

  • Utilizing magnetic resonance imaging (MRI) and optical imaging on autopsy specimens.
  • Acquiring ultra-high-resolution images with enhanced contrast for cortical region delineation.
  • Validating ex vivo MRI contrast properties against histologic stained sections.

Main Results:

  • Postmortem imaging enables the creation of probabilistic maps based on validated MRI contrast.
  • These validated maps can be accurately projected onto in vivo models.
  • The approach has been successfully applied to neuropathologic studies, particularly of the medial temporal lobe.

Conclusions:

  • Postmortem imaging is a valuable tool for ultra-high-resolution brain mapping and structural validation.
  • This method improves the delineation of cortical boundaries compared to standard in vivo MRI.
  • Postmortem imaging, combined with optical imaging advancements, holds significant promise for advancing neuropathologic research.