Haar transform analysis of photon time-of-flight measurements for quantification of optical properties in scattering media.
Haar transform analysis of photon time-of-flight measurements for quantification of optical properties in scattering media.
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光子飞行时间测量的哈尔变换分析，用于量化散射介质中的光学特性。
DOI：
10.1364/ao.42.002923
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发表时间：
2003
期刊：
影响因子：
1.9
通讯作者：
D. Burns
中科院分区：
文献类型：
--
作者：
Claudia E. W. Gributs;D. Burns
描述了一种基于光子飞行时间 (TOF) 分布的哈尔变换 (HT) 分析来独立量化样品吸收和散射特性的方法。从已知成分（0 < mu(a) < 0.025 mm(-1)；100 < mu(s) < 250 mm(-1)）的吸收/散射牛奶样品中获取一系列反射光子 TOF 测量结果。计算剖面的HT，并通过遗传算法（GA）确定基于最简约小波子集的回归。此外，还研究了在遗传算法之前计算小波系数的轮廓的对数或绝对值的效用。结果表明，通过使用频率小于 800 MHz 的选定小波的对数，可以估计出吸收系数，其变异系数 (C.V.) 为 6.7%，r2 为 0.99。散射系数用 C.V. 估计。频率小于 400 MHz 的小波的对数为 2.3%，r2 为 0.99。上述结果表明，可以开发一种基于低频开关的简化仪器来量化高散射介质的光学特性。
A method to independently quantify the absorption and the scattering properties of samples based on the analysis of the Haar transform (HT) of photon time-of-flight (TOF) distributions is described. A series of reflectance photon TOF measurements were acquired from absorbing/scattering milk samples of known composition (0 < mu(a) < 0.025 mm(-1); 100 < mu(s) < 250 mm(-1)). The HT of the profiles was calculated, and the regression based on the most parsimonious subset of wavelets was determined by the genetic algorithm (GA). In addition, the utility of computing the logarithm of the profiles or of the absolute value of the wavelet coefficients before the GA was studied. Results show that the absorption coefficient could be estimated with a coefficient of variation (C.V.) of 6.7% and an r2 of 0.99 by use of the log of selected wavelets of frequency less than 800 MHz. Scattering coefficients were estimated with a C.V. of 2.3% and an r2 of 0.99 with the log of wavelets of frequency less than 400 MHz. The above results suggest that a simplified instrument based on low-frequency switches could be developed to quantify the optical properties of highly scattering media.
影响因子：
7.4
作者：
Q. Ding;G. W. Small;M. Arnold
通讯作者：
Q. Ding;G. W. Small;M. Arnold
用于确定组织氧合的时间和频率分辨光谱的定量。
影响因子：
2.9
作者：
Sevick,EM;Chance,B;Leigh,J;Nioka,S;Maris,M
通讯作者：
Maris,M
影响因子：
6.5
作者：
ANDERSON, RR;PARRISH, JA
通讯作者：
PARRISH, JA