The effect of overlying tissue on NIR light propagation in neonatal brain

E. Okada, D. Delpy
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引用次数: 15

Abstract

The effect of the layered surface tissue of the neonatal head on near infrared spectroscopy (NIRS) measurement of brain oxygenation has been investigated by Monte Carlo simulation. Four different cylindrical models have been adopted in order to investigate the effect of the clear cerebrospinal fluid (CSF) layer surrounding the brain on the light propagation. The simplest is a four layered model without a clear CSF layer whilst the most sophisticated model consists of five layers including the clear layer containing slots imitating the sulci in the brain. The fractional optical pathlength in each layer and spatial sensitivity profiles are predicted to examine the contribution of each layer to the NIRS signal. The clear CSF layer was found to affect the light propagation in the neonatal head, causing the light to follow the CSF boundary. This phenomena reduces the contribution of absorption changes in the white matter to the NIRS signal. However the contribution of the brain exceeds 75 % at an optode spacing of 50 mm in the neonatal head, a much greater contribution than observed for the adult brain. The spatial sensitivity around the sulci increases slightly, but the sulcus structure does not significantly affect the optical pathlength and general trend of the spatial sensitivity profile.
覆层组织对新生儿脑内近红外光传播的影响
采用蒙特卡罗模拟研究了新生儿头部分层表面组织对近红外光谱(NIRS)脑氧测量的影响。采用四种不同的圆柱形模型,研究了脑周围透明脑脊液层对光传播的影响。最简单的是一个没有清晰脑脊液层的四层模型,而最复杂的模型由五层组成,包括透明层,其中包含模仿脑沟的凹槽。预测了每一层的分数光路长度和空间灵敏度分布,以检查每一层对近红外光谱信号的贡献。清晰的脑脊液层影响光在新生儿头部的传播,使光沿着脑脊液边界。这种现象降低了白质吸收变化对近红外光谱信号的贡献。然而,当新生儿头部的光电二极管间距为50mm时,大脑的贡献超过75%,比成人大脑的贡献要大得多。沟槽周围的空间灵敏度略有增加,但沟槽结构对光路长度和空间灵敏度曲线的总体趋势影响不显著。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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