Multiple diagnosis based on photoplethysmography: hematocrit, SpO2, pulse, and respiration

Gilwon Yoon; Jong Youn Lee; Kye Jin Jeon; Kun-Kook Park; Hyung S. Yeo; Hyun Tae Hwang; Hong Sig Kim; In-Duk Hwang

doi:10.1117/12.482947

12 September 2002 Multiple diagnosis based on photoplethysmography: hematocrit, SpO₂, pulse, and respiration

Gilwon Yoon, Jong Youn Lee, Kye Jin Jeon, Kun-Kook Park, Hyung S. Yeo, Hyun Tae Hwang, Hong Sig Kim, In-Duk Hwang

Proceedings Volume 4916, Optics in Health Care and Biomedical Optics: Diagnostics and Treatment; (2002) https://doi.org/10.1117/12.482947
Event: Photonics Asia, 2002, Shanghai, China

Abstract

Photo-plethysmography measure pulsatile blood flow in real-time and non-invasively.One of widely known application of PPG is a measurement of saturated oxygen in arterial blood (SpO2). In our work , using several wave length more than those used in a pulse oximeter, an algorithm and instrument have been developed to measure hematocrit, saturated oxygen pulse and respiratory rates simultaneously.To predict hemotocrit, a dedicated algorithm is developed based on scattering of RBC and a protocall for detecting outlier signal is used to increase accuracy and reliability.Digital filtering techniques are used to exart respiratory rate signal. Utilization of wave length under 1000nm and a multi-wavelength LED array chip and digital-oriented electronic enable us to make a compact device. Our preliminary clinical trails shown that the achived percent errors are±8.2% for hematocrit when tested with 594 person ,r2 for SpO fitting is 0.99985 when tested with a Bi-Tek pulse oximeter simulator and the SPO2 error for in vivo test is ±2.5% over the range of 75~100%. The error of pulse rates is less than ±5%. We obtained a positive predictive value of 96% for respiratory rates in qualitative analysis.

Citation Download Citation

Gilwon Yoon, Jong Youn Lee, Kye Jin Jeon, Kun-Kook Park, Hyung S. Yeo, Hyun Tae Hwang, Hong Sig Kim, and In-Duk Hwang "Multiple diagnosis based on photoplethysmography: hematocrit, SpO₂, pulse, and respiration", Proc. SPIE 4916, Optics in Health Care and Biomedical Optics: Diagnostics and Treatment, (12 September 2002); https://doi.org/10.1117/12.482947

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