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Probing the Brain in Autism Using fMRI and Diffusion Tensor Imaging

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Published on: September 12, 2011

A diffusion tensor imaging study of suicide attempters.

Doreen M Olvet^1,2, Denis Peruzzo³, Binod Thapa-Chhetry¹

¹Department of Psychiatry, Molecular Imaging and Neuropathology Division (MIND), Columbia University, New York, NY, 10032, USA.

Journal of Psychiatric Research

|January 28, 2014

Summary

This summary is machine-generated.

White matter abnormalities, specifically lower fractional anisotropy (FA) in the dorsomedial prefrontal cortex, are linked to suicide attempts. This finding may help identify individuals at risk for suicidal behavior.

Keywords:

Diffusion tensor imaging Dorsomedial prefrontal cortex Major depressive disorder Suicide attempt Tract-based spatial statistics White matter

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Area of Science:

Neuroimaging
Neuroscience
Psychiatry

Background:

Limited research exists on white matter abnormalities in suicide attempters using diffusion tensor imaging (DTI).
Understanding these changes is crucial for identifying biological markers associated with suicidal behavior.

Purpose of the Study:

To investigate white matter alterations in individuals with a history of suicide attempts.
To identify specific brain regions affected by prior suicide attempts using DTI.

Main Methods:

Diffusion tensor imaging (DTI) scans were performed on suicide attempters with major depressive disorder (MDD), MDD non-attempters, and healthy participants.
Fractional anisotropy (FA) and apparent diffusion coefficient (ADC) were analyzed using region of interest (ROI) and tract-based spatial statistics (TBSS).
Regions of interest focused on white matter near the anterior cingulate cortex and medial prefrontal cortex.

Main Results:

Suicide attempters exhibited lower FA in the dorsomedial prefrontal cortex compared to both MDD non-attempters and healthy participants.
Tract-based spatial statistics (TBSS) confirmed reduced FA in the right dorsomedial prefrontal cortex of suicide attempters.
No significant differences in apparent diffusion coefficient (ADC) were observed across groups.

Conclusions:

Reduced FA in the dorsomedial prefrontal cortex is associated with a history of suicide attempts.
This finding suggests the dorsomedial prefrontal cortex is a potential area of interest for understanding the predisposition to suicidal behavior.
Converging evidence from other imaging studies supports the role of this region in suicidal behavior.