In vivoevaluation of optic nerve aging in adult rhesus monkey by diffusion tensor imaging

Quantitative Imaging in Medicine and Surgery

Longchuan Li⁵  Yumei Yan²  Todd M. Preuss⁴  James G. Herndon⁴  Xiaodong Zhang¹  Xiaoping Hu³ 

[1] Yerkes Imaging Center, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia 30329, USA; Division of Neuropharmacology and Neurologic Diseases, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia 30329, USA;Yerkes Imaging Center, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia 30329, USA;;The Wallace H. Coulter Department of Biomedical Engineering, Emory University and Georgia Institute of Technology, Atlanta, Georgia 30322, USADivision of Neuropharmacology and Neurologic Diseases, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia 30329, USA;Marcus Autism Center, Children’s Healthcare of Atlanta, Emory University, Atlanta, Georgia 30322, USA;

关键词: Optic nerve aging;    white matter;    mean diffusivity (MD);    fractional anisotropy (FA);    non-human primate;    parallel imaging;    GRAPPA;   

DOI  :  10.3978/j.issn.2223-4292.2014.02.04

学科分类：外科医学

来源: AME Publications

【 摘 要 】

Aging of the optic nerve can result in reduced visual sensitivity or vision loss. Normal optic nerve aging has been investigated previously in tissue specimens but poorly explored in vivo. In the present study, the normal aging of optic nerve was evaluated by diffusion tensor imaging (DTI) in non-human primates. Adult female rhesus monkeys at the ages of 9 to 13 years old (young group, n=8) and 21 to 27 years old (old group, n=7) were studied using parallel-imaging-based DTI on a clinical 3T scanner. Compared to young adults, the old monkeys showed 26% lower fractional anisotropy (P<0.01), and 44% greater radial diffusivity, although the latter difference was of marginal statistical significance (P=0.058). These MRI findings are largely consistent with published results of light and electron microscopic studies of optic nerve aging in macaque monkeys, which indicate a loss of fibers and degenerative changes in myelin sheaths.

【 授权许可】

Unknown