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
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发表时间:
2013-09
影响因子:
2.2
通讯作者:
Sukstanskii, A. L.
中科院分区:
文献类型:
--
作者:
Sukstanskii, A. L.
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.
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