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Structural magnetic resonance image averaging in schizophrenia

A Wolkin1, H Rusinek, G Vaid

  • 1Psychiatry Service, New York VA Medical Center, New York 10010, USA. wolkin.adam@new-york.va.gov

The American Journal of Psychiatry
|August 12, 1998
PubMed
Summary

Structural magnetic resonance imaging reveals widespread brain abnormalities in schizophrenia patients, including cortical thinning and ventricular enlargement. This study validates intersubject averaging for detecting these diffuse structural differences.

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Area of Science:

  • Neuroimaging
  • Psychiatric Research
  • Structural MRI

Background:

  • Intersubject averaging of structural MRI is an underutilized technique for group comparisons.
  • Previous research suggested specific thalamic and white matter abnormalities in schizophrenia.

Purpose of the Study:

  • To evaluate the utility of linear intersubject averaging for detecting group differences in brain structure.
  • To extend prior findings on structural brain abnormalities in schizophrenia.

Main Methods:

  • Acquired high-resolution T1-weighted structural MRI scans from 25 schizophrenic patients and 25 controls.
  • Created averaged brain images for each group using a bounding box procedure.
  • Analyzed differences using pixel-wise effect size maps.

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Main Results:

  • Widespread, patchy signal intensity differences observed in cortical and periventricular areas, including white matter tracts.
  • Differences suggest cortical thinning, sulcal widening, and ventricular enlargement.
  • No significant differences found in thalamus or surrounding white matter.

Conclusions:

  • Findings support the presence of diffuse gray and white matter abnormalities in the studied schizophrenic population.
  • Intersubject averaging effectively identified widespread structural differences.