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Subfield-specific hippocampal microstructural alterations in schizophrenia: A high-resolution DTI study.

Kunxuan Wang1, Yuan Sun2, Chao Xia1

  • 1Department of Radiology, West China Hospital, Sichuan University, Chengdu, 610041, China.

Schizophrenia Research
|October 24, 2025
PubMed
Summary

Schizophrenia patients show significant hippocampal microstructural changes, particularly in CA2/3, impacting cognitive function. Diffusion tensor imaging reveals these alterations may precede volume loss, offering insights into disease progression.

Keywords:
Cerebral microstructural integrityCognitive impairmentHigh-resolution Diffusion tensor imaging (DTI)Hippocampal subfieldsSchizophrenia

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Area of Science:

  • Neuroimaging
  • Neuroscience
  • Psychiatry

Background:

  • Hippocampal subfield alterations in schizophrenia (SCZ) are not well understood.
  • This study focuses on microstructural changes in SCZ using diffusion tensor imaging (DTI).

Purpose of the Study:

  • To investigate subfield-specific microstructural integrity of the hippocampus in SCZ patients.
  • To correlate these microstructural changes with clinical features.

Main Methods:

  • Used high-resolution 3.0T MRI and DTI (0.9-mm isotropic resolution) on 46 SCZ patients and 55 controls.
  • Quantified hippocampal subfield volumes and microstructural integrity (FA, MD, AD, RD).
  • Compared DTI metrics and volumes, correlating them with clinical data.

Main Results:

  • Significant microstructural changes found in 9 of 16 hippocampal subfields in SCZ patients.
  • Predominant pattern of increased mean diffusivity (MD), axial diffusivity (AD), and radial diffusivity (RD), with heterogeneous fractional anisotropy (FA).
  • CA2/3 subfield showed significant diffusivity alterations correlated with semantic fluency deficits.

Conclusions:

  • Hippocampal microstructural compromise in SCZ is subfield-specific and detectable by DTI.
  • DTI parameters are more sensitive to early changes than volumetric measures.
  • Hippocampal microstructural alterations, especially in CA2/3, are linked to cognitive deficits in SCZ.