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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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Probing the Brain in Autism Using fMRI and Diffusion Tensor Imaging
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Microstructural white matter changes in euthymic bipolar patients: a whole-brain diffusion tensor imaging study.

Michèle Wessa1, Josselin Houenou, Marion Leboyer

  • 1INSERM, U797, CEA-INSERM U797 Neuroimaging and Psychiatry, IFR49, University Paris Sud, University Paris 5, Hospital Department Frédéric Joliot, IBM, Orsay, France. michele.wessa@zi-mannheim.de

Bipolar Disorders
|July 24, 2009
PubMed
Summary
This summary is machine-generated.

This study found increased white matter integrity in euthymic bipolar patients, suggesting altered brain connectivity during remission. These findings highlight potential biomarkers for bipolar disorder.

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Area of Science:

  • Neuroimaging
  • Psychiatry
  • Brain Connectivity

Background:

  • Altered mood states and emotion regulation in affective disorders are linked to brain networks.
  • Previous diffusion tensor imaging (DTI) studies in bipolar disorder (BD) focused on frontal regions, revealing white matter integrity changes.

Purpose of the Study:

  • To investigate whole-brain white matter integrity modifications in euthymic bipolar patients.
  • To extend previous findings by examining patients with minimal manic and depressive symptoms.

Main Methods:

  • Diffusion tensor imaging (DTI) was performed on 22 euthymic bipolar patients (DSM-IV-TR diagnosis) and 21 healthy controls.
  • Voxel-based, whole-brain analyses explored group differences in fractional anisotropy (FA) and mean diffusivity (MD).

Main Results:

  • Significantly increased fractional anisotropy (FA) was observed in medial frontal, precentral, inferior parietal, and occipital white matter in bipolar patients compared to controls.
  • No significant group differences in mean diffusivity (MD) were detected.

Conclusions:

  • Increased FA in euthymic bipolar patients suggests enhanced directional coherence of white matter fibers during remission.
  • These findings may indicate underlying neurobiological alterations persisting even in the absence of acute mood symptoms.