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Basic Science and Pathogenesis.

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Postmortem coagulated blood acts as an intrinsic contrast agent for enhanced vascular MRI in brain tissue. This novel method improves visualization of small vessels, aiding Alzheimer

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Area of Science:

  • Neuroimaging
  • Vascular Biology
  • Pathology

Background:

  • Postmortem MRI is crucial for interpreting Alzheimer's disease (AD) pathology, bridging in vivo imaging and histopathology.
  • Imaging postmortem vasculature is challenging due to the ineffectiveness of traditional contrast agents.
  • Blood clots offer a potential intrinsic contrast medium for postmortem vascular MRI.

Purpose of the Study:

  • To explore the utility of postmortem blood clots as contrast media for enhancing vascular MRI.
  • To establish a method for detailed vascular mapping in postmortem brain specimens.

Main Methods:

  • Human brain tissues from individuals with epilepsy, Parkinson's Disease, and AD were studied.
  • Whole-brain 7T MRI was performed, followed by high-resolution preclinical MRI of tissue chunks.
  • Histopathological staining (H&E, LFB) was used to evaluate vascular morphology and blood clot formation.

Main Results:

  • High-resolution susceptibility-weighted imaging (SWI) revealed clear small vessel contrast in gray and white matter.
  • Postmortem MRI findings closely resembled in vivo USPIO-enhanced MRI, illustrating intrahippocampal vasculatures.
  • Histopathology confirmed blood clot structures within the vasculature of various brain regions.

Conclusions:

  • Postmortem coagulated blood serves as an intrinsic contrast agent for T2*-weighted imaging of small vasculatures.
  • This technique enables detailed vascular mapping in postmortem specimens, complementing histopathological analysis.
  • The method enhances understanding of vascular contributions to AD and related dementias.