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Related Concept Videos

Brain Imaging01:14

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).

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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Anterior thalamic radiation integrity in schizophrenia: a diffusion-tensor imaging study.

Daniel Mamah1, Thomas E Conturo, Michael P Harms

  • 1Department of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, United States. mamahd@psychiatry.wustl.edu

Psychiatry Research
|July 13, 2010
PubMed
Summary

Schizophrenia patients show reduced white matter integrity in the right anterior limb of the internal capsule (ALIC), impacting cognitive functions like executive function and working memory.

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Area of Science:

  • Neuroscience
  • Neuroimaging
  • Psychiatry

Background:

  • The anterior limb of the internal capsule (ALIC) contains the anterior thalamic radiation (ATR), crucial for thalamus-prefrontal cortex communication.
  • ATR abnormalities are implicated in cognitive deficits and negative symptoms of schizophrenia.

Purpose of the Study:

  • To investigate the microstructural integrity of the ATR within the ALIC in schizophrenia using diffusion-tensor imaging.
  • To selectively analyze the medial portion of the ALIC (mALIC) for fiber integrity changes.

Main Methods:

  • Region-of-interest based diffusion-tensor imaging was employed.
  • Fractional anisotropy (FA) was measured in the total ALIC (tALIC) and mALIC in 39 schizophrenia patients and 33 controls.
  • Correlations between FA, cognitive function, and psychopathology were analyzed.

Main Results:

  • Schizophrenia patients exhibited significantly lower FA in the right tALIC (4.55%) and right mALIC (5.38%) compared to controls.
  • No significant group differences were found in the left ALIC.
  • Right ALIC integrity correlated with executive function and working memory performance.

Conclusions:

  • The study reveals asymmetric, right-sided microstructural changes in the ALIC in schizophrenia.
  • These alterations in white matter integrity are associated with cognitive impairments, particularly in executive functions.
  • ALIC microstructural changes may contribute to cognitive dysfunction observed in schizophrenia.