Biexponential apparent diffusion coefficient parametrization in adult vs newborn brain

被引:75
作者
Mulkern, RV [1 ]
Vajapeyam, S
Robertson, RL
Caruso, PA
Rivkin, MJ
Maier, SE
机构
[1] Harvard Univ, Childrens Hosp, Sch Med, Dept Radiol, Boston, MA 02115 USA
[2] Harvard Univ, Childrens Hosp, Sch Med, Dept Neurol, Boston, MA 02115 USA
[3] Harvard Univ, Brigham & Womens Hosp, Sch Med, Dept Radiol, Boston, MA 02115 USA
关键词
brain water diffusion; biexponential decay; water compartmentation; newborn brain;
D O I
10.1016/S0730-725X(01)00383-6
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
The decay of brain water signal with b-factor in adult and newborn brains has been measured over an extended b-factor range. Measurements of the apparent diffusion coefficient (ADC) decay curves were made at 16 b-factors from 100 to 5000 s/mm(2) along three orthogonal directions using a line scan diffusion imaging (LSDI) sequence to acquire data from 0.09 ml voxels in a mid-brain axial slice. Regions-of-interest (ROIs) in cortical gray (CG) and white matter in the internal capsule (IQ were selected for ADC decay curve analyses using a biexponential fitting model over this extended b-factor range. Measures of the fast and slow ADC component amplitudes and the traces of the fast and slow diffusion coefficients were obtained from CG and IC Rolls in both adults and newborns. The ADC decay curves from the newborn brain regions were found to have a significantly higher fraction of the fast diffusion ADC component than corresponding regions in the adult brain. The results demonstrate that post-natal brain development has a profound affect on the biexponential parameters which characterize the decay of water signal over an extended b-factor range in both gray and white matter. (C) 2001 Elsevier Science Inc. All rights reserved.
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页码:659 / 668
页数:10
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