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arXiv 1210.3014physics.bio-phcond-mat.dis-nncond-mat.soft
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基于时间相关扩散的活体组织微结构表征

Characterizing microstructure of living tissues with time-dependent diffusion

Dmitry S. Novikov, Els Fieremans, Jens H. Jensen, Joseph A. Helpern

摘要:

分子扩散测量被广泛用于非侵入性地探测材料和活生物体中的微观结构。扩散度量与微观结构的精确关系仍然是一个主要挑战:在复杂的样品中,通常不清楚哪些结构特征最相关,并且可以量化。在这里,我们分类的分子速度自相关函数中的长时间尾指数的结构复杂性。动力学指数的具体值使我们能够确定影响肌肉和大脑中MRI测量的水扩散的相关组织显微解剖结构,以及缺血性卒中的显微结构变化。我们的框架提出了一个系统的方法来确定最相关的部分结构复杂性使用运输测量与各种技术。

英文摘要:

Molecular diffusion measurements are widely used to probe microstructure in materials and living organisms noninvasively. The precise relation of diffusion metrics to microstructure remains a major challenge: In complex samples, it is often unclear which structural features are most relevant and can be quantified. Here we classify the structural complexity in terms of the long time tail exponent in the molecular velocity autocorrelation function. The specific values of the dynamical exponent let us identify the relevant tissue microanatomy affecting water diffusion measured with MRI in muscles and in brain, and the microstructural changes in ischemic stroke. Our framework presents a systematic way to identify the most relevant part of structural complexity using transport measured with a variety of techniques.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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