Exact analytical results for ADC with oscillating diffusion sensitizing gradients.

Exact analytical results for ADC with oscillating diffusion sensitizing gradients.
复制标题

具有振荡扩散敏化梯度的ADC的确切分析结果。

DOI:
10.1016/j.jmr.2013.06.016
复制
发表时间:
2013-09
影响因子:
2.2
通讯作者:
Sukstanskii, A. L.
Sukstanskii, A. L.
中科院分区:
化学3区
文献类型:
--
作者:
Sukstanskii, A. L.

文献摘要

参考文献

被引文献

相似文献

对振荡扩散敏化梯度情况下的表观扩散系数进行了分析。在ADC的高频展开中,得到了任意振荡次数n的精确解析表达式,这些表达式对任意系统几何都是通用的和有效的。在限制扩散的一维简单模型框架下,得到了ADC高频展开的有效性条件。这些条件对于cos型和sin型梯度有很大的不同:对于cos型梯度,当单个振荡周期小于特征扩散时间时,高频扩展有效,ADC的频率依赖性对任意N几乎相同;相反,对于sin型梯度,只有当总扩散时间小于特征扩散时间时才能实现高频状态,ADC的频率依赖性对不同N不同。
The apparent diffusion coefficient (ADC) is analyzed for the case of oscillating diffusion sensitizing gradients. Exact analytical expressions are obtained in the high-frequency expansion of the ADC for an arbitrary number of oscillations N. These expressions are universal and valid for arbitrary system geometry. The validity conditions of the high-frequency expansion of ADC are obtained in the framework of a simple 1D model of restricted diffusion. These conditions are shown to be substantially different for cos- and sin-type gradients: for the cos-type gradients, the high-frequency expansion is valid when the period of a single oscillation is smaller than the characteristic diffusion time, the frequency dependence of ADC being practically the same for any N. In contrast, for the sin-type gradients, the high-frequency regime can be achieved only when the total diffusion time is smaller than the characteristic diffusion time, the frequency dependence of ADC being different for different N.
DOI: 10.1006/jmre.1997.1233
发表时间: 1997-11-01
影响因子: 2.2
作者:
Callaghan, PT
通讯作者: Callaghan, PT
DOI: 10.1002/mrm.20732
发表时间: 2006-01-01
影响因子: 3.3
作者:
Parsons, EC;Does, MD;Gore, JC
通讯作者: Gore, JC
DOI: 10.1002/mrm.22704
发表时间: 2011-04-01
影响因子: 3.3
作者:
Xu, Junzhong;Xie, Jingping;Gore, John C.
通讯作者: Gore, John C.
DOI: 10.1016/j.jmr.2004.10.006
发表时间: 2005-01-01
影响因子: 2.2
作者:
Zielinski, LJ;Hürlimann, MD
通讯作者: Hürlimann, MD
DOI: 10.1016/s1090-7807(03)00248-9
发表时间: 2003-11-01
影响因子: 2.2
作者:
Zielinski, LJ;Sen, PN
通讯作者: Sen, PN