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Abstract #4940

Free water DTI for evaluating gray matter microstructure in major depressive disorder: A preliminary study

Xuecong Lin1, Junyan Wen1, Shanshan Yang1, Wei Cui2, Long Qian2, Yanyu Hao1, Liya Gong1, Weikang Huang3, Haijie Zhang4, and Ge Wen1
1Medical Imaging Department, Nanfang Hospital, Guangzhou, China, 2MR Research, GE Healthcare, Beijing, China, Beijing, China, 3Department of Radiology, Zengcheng Branch of Nanfang Hospital, Guangzhou, China, 4PET/CT Center, Department of Nuclear Medicine, First Affiliated Hospital of Shenzhen University, Shenzhen Second People’s Hospital, Shenzhen, China

Synopsis

Keywords: Psychiatric Disorders, Brain, Major depressive disorderMajor depressive disorder (MDD) is a common mental disease with unclear pathophysiology. Herein, we explored the differences in the whole-brain gray matter free-water axial diffusivity (AD) and mean diffusivity (MD) values between MDD patients and healthy controls using free-water DTI. The results showed altered free-water AD and MD values in specific regions of the gray matter in MDD patients, which may be associated with alterations in the brain gray matter microstructure, such as microstructure damage or neurodegeneration. Thus, these quantitative variables could be used as valuable biomarkers that could further our understanding of the pathophysiological mechanisms of depression.

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