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Updated: Jul 1, 2025

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

Published on: December 2, 2017

基于反射光角度估计的远程光聚体测量仪.

Xuanhe Fan¹, Fangwu Liu², Jinjin Zhang¹

¹China University of Geosciences, Wuhan, China, School of Automation, Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems, People's Republic of China.

Physiological measurement

|March 2, 2024

概括

镜面反射的光显著影响成像光电脉学 (iPPG) 心率 (HR) 的准确性. 本研究提出了一种估计反射光角度的方法,改善了在明亮环境中HR的测量.

关键词:

角度估计的角度估计.反射的光反射的光.遥控心率测量器是一种遥控心率测量器.远程摄影复合声学 (Remote photoplethysmography) 是一种使用远程摄影的方法.不均的照明不均的照明

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相关实验视频

Last Updated: Jul 1, 2025

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

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Published on: December 2, 2017

Measurement of Carotenoids in Perifovea using the Macular Pigment Reflectometer

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Published on: January 29, 2020

A Rapid and Chemical-free Hemoglobin Assay with Photothermal Angular Light Scattering

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科学领域:

生物医学工程生物医学工程
光学传感传感器是什么?
生理监测生理监测

背景情况:

之前对图像光电显微镜 (iPPG) 用于心率 (HR) 测量的研究集中在光强度,面部反射角度和运动器件上.
镜面反射光对iPPG精度的特定影响尚未被彻底研究.
了解和减轻反射反射对于强大的HR估计至关重要.

研究的目的:

调查光镜反射光对基于iPPG的HR估计准确性的影响.
开发和验证一种用于估计反射光的方向的方法.
提高HR测量的准确性,特别是在具有挑战性的照明条件下.

主要方法:

收集了来自25个对象的100个视频,分别采用了四个不同的镜面反射角度.
提取了面部区域的角度和照明,使用插值来匹配样本点.
通过确定在合适曲线中最大重量的角度来估计反射光的角度.

主要成果:

发现,增加镜面反射的光线会降低HR估计的准确性.
在60度反射角度,HR精度 (ACC) 提高了0.7%,与0度相比,信号噪声比和皮尔森相关系数分别增加了0.8dB和0.035,相比之下.
拟议的方法实现了低误差率 (RMSE: 1.173°,SD: 0.978°,平均误差: 0.773°) 的反射光角度估计和提高了1.73%的平均HR ACC在PURE数据集与传统方法相比.

结论:

镜面反射的光是影响iPPG HR测量准确性的重要因素.
开发的估计反射光角度的方法提高了HR测量精度.
这种技术具有临床应用的潜力,特别是在明亮的外科环境中,用于精确的血液体积监测.