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Proceedings Paper

Multiple diagnosis based on photoplethysmography: hematocrit, SpO2, pulse, and respiration
Author(s): Gilwon Yoon; Jong Youn Lee; Kye Jin Jeon; Kun-Kook Park; Hyung S. Yeo; Hyun Tae Hwang; Hong Sig Kim; In-Duk Hwang
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Paper Abstract

Photo-plethysmography measures pulsatile blood flow in real-time and non-invasively. One of widely known applications of PPG is the measurement of saturated oxygen in arterial blood(SpO2). In our work, using several wavelengths 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 hematocrit, a dedicated algorithm is developed based on scattering of RBC and a protocol for detecting outlier signals is used to increase accuracy and reliability. Digital filtering techniques are used to extract respiratory rate signals. Utilization of wavelengths under 1000nm and a multi-wavelength LED array chip and digital-oriented electronics enable us to make a compact device. Our preliminary clinical trials show that the achieved percent errors are ±8.2% for hematocrit when tested with 594 persons, R2 for SpO2 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.

Paper Details

Date Published: 12 September 2002
PDF: 4 pages
Proc. SPIE 4916, Optics in Health Care and Biomedical Optics: Diagnostics and Treatment, (12 September 2002); doi: 10.1117/12.482947
Show Author Affiliations
Gilwon Yoon, Samsung Advanced Institute of Technology (South Korea)
Jong Youn Lee, Samsung Advanced Institute of Technology (South Korea)
Kye Jin Jeon, Samsung Advanced Institute of Technology (South Korea)
Kun-Kook Park, Samsung Advanced Institute of Technology (South Korea)
Hyung S. Yeo, Samsung Advanced Institute of Technology (South Korea)
Hyun Tae Hwang, Samsung Advanced Institute of Technology (South Korea)
Hong Sig Kim, Samsung Advanced Institute of Technology (South Korea)
In-Duk Hwang, Samsung Advanced Institute of Technology (South Korea)


Published in SPIE Proceedings Vol. 4916:
Optics in Health Care and Biomedical Optics: Diagnostics and Treatment
Britton Chance; Mingzhe Chen; Gilwon Yoon, Editor(s)

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