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Related Experiment Video

Updated: Dec 17, 2025

Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury
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Transient Global Amnesia: A Diffusion and Perfusion MRI study.

Kazuhide Shimizu1, Shoko Hara1,2, Masaaki Hori2

  • 1Department of Neurosurgery, Tokyo Medical and Dental University, Tokyo, Japan.

Journal of Neuroimaging : Official Journal of the American Society of Neuroimaging
|June 30, 2020
PubMed
Summary
This summary is machine-generated.

Transient global amnesia (TGA) shows no significant hippocampal microstructural or perfusion changes on advanced MRI. This suggests TGA may not cause lasting damage to the hippocampus, even with diffusion-restricted lesions.

Keywords:
Arterial spin labelingdiffusion-weighted imageneurite orientation dispersion and density imaging (NODDI)transient global amnesia

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Area of Science:

  • Neurology
  • Neuroimaging

Background:

  • Transient global amnesia (TGA) is a rare neurological condition characterized by sudden, temporary anterograde amnesia.
  • The exact pathophysiology of TGA remains unclear, with imaging studies yielding controversial results.
  • Diffusion-weighted imaging (DWI) sometimes reveals small hippocampal lesions, suggesting potential ischemic damage.

Purpose of the Study:

  • To investigate hippocampal microstructure and perfusion in TGA patients using advanced neuroimaging techniques.
  • To determine if diffusion-restricted lesions in TGA are associated with microstructural or perfusion abnormalities.
  • To explore the relationship between neurite orientation dispersion and density imaging (NODDI) and arterial spin labeling (ASL) parameters in TGA.

Main Methods:

  • Ten TGA patients underwent conventional MRI, NODDI, and ASL.
  • Intracellular volume fraction (ICVF) and orientation dispersion index (ODI) from NODDI, and cerebral blood flow (CBF) from ASL were calculated.
  • Hippocampal parameters were compared between DWI-positive and DWI-negative regions, and correlations were analyzed.

Main Results:

  • Three patients exhibited unilateral DWI-positive lesions.
  • No significant differences in ICVF, ODI, or CBF were found between DWI-positive and DWI-negative hippocampi.
  • A significant positive correlation was observed between ODI and CBF (R = .51, P = .021).

Conclusions:

  • This is the first study using NODDI and ASL to assess TGA patients.
  • No clear microstructural or perfusion abnormalities were detected in the hippocampus associated with DWI lesions in TGA.
  • Findings suggest TGA may not result in destructive hippocampal damage or persistent microstructural/perfusion deficits.