期刊
MAGNETIC RESONANCE IN MEDICINE
卷 58, 期 5, 页码 865-870出版社
JOHN WILEY & SONS INC
DOI: 10.1002/mrm.21409
关键词
myelin water fraction; multicompartment analysis; demyelination; multiple sclerosis; postmortem
Quantitative mapping of the myelin water content can provide significant insight into the pathophysiology of several white matter diseases, such as multiple sclerosis and leukoencephalopathies, and can potentially become a useful clinical tool for early diagnosis of these diseases. In this study, multicompartment analysis of T-2(*) decay (MCAT2(*)) was used for the quantitative mapping of myelin water fraction (MWF). T-2(*) decay of each voxel at multiple slice locations was acquired in fixed human brains using a multigradient-echo (MGRE) pulse sequence with alternating readout gradient polarities. Compared to prior techniques using Carr-Purcell-Meiboom-Gill (CPMG) acquisition, the MGRE acquisition approach has: 1) a very short first echo time (approximate to 2 ms) and echo-spacing (approximate to 1 ms), which allows for the acquisition of multiple sampling points during the fast decay of the myelin water signal; 2) a low RF duty cycle, which is especially important for achieving acceptable specific absorption rate (SAR) levels at high field strengths. Multicompartment analysis was then applied to the T-2(*) decay in each pixel using a 3-pool model of white matter to detect the signal arising from the myelin water, myelinated axonal water, and mixed water compartments.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据