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Title: Noncontact simultaneous dual wavelength photoplethysmography: A further step toward noncontact pulse oximetry

Abstract

We present a camera-based device capable of capturing two photoplethysmographic (PPG) signals at two different wavelengths simultaneously, in a remote noncontact manner. The system comprises a complementary metal-oxide semiconductor camera and dual wavelength array of light emitting diodes (760 and 880 nm). By alternately illuminating a region of tissue with each wavelength of light, and detecting the backscattered photons with the camera at a rate of 16 frames/wavelength s, two multiplexed PPG wave forms are simultaneously captured. This process is the basis of pulse oximetry, and we describe how, with the inclusion of a calibration procedure, this system could be used as a noncontact pulse oximeter to measure arterial oxygen saturation (S{sub p}O{sub 2}) remotely. Results from an experiment on ten subjects, exhibiting normal S{sub p}O{sub 2} readings, that demonstrate the instrument's ability to capture signals from a range of subjects under realistic lighting and environmental conditions are presented. We compare the signals captured by the noncontact system to a conventional PPG signal captured concurrently from a finger, and show by means of a J. Bland and D. Altman [Lancet 327, 307 (1986); Statistician 32, 307 (1983)] test, the noncontact device to be comparable to a contact device as amore » monitor of heart rate. We highlight some considerations that should be made when using camera-based ''integrative'' sampling methods and demonstrate through simulation, the suitability of the captured PPG signals for application of existing pulse oximetry calibration procedures.« less

Authors:
; ;  [1];  [2]
  1. Department of Electronic Engineering, National University of Ireland, Maynooth, Maynooth Co. Kildare (Ireland)
  2. (Ireland)
Publication Date:
OSTI Identifier:
20953433
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 78; Journal Issue: 4; Other Information: DOI: 10.1063/1.2724789; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 60 APPLIED LIFE SCIENCES; BLOOD VESSELS; CALIBRATION; CAMERAS; EQUIPMENT; HEART; LIGHT EMITTING DIODES; OXYGEN; PULSES; SIGNALS; WAVELENGTHS

Citation Formats

Humphreys, Kenneth, Ward, Tomas, Markham, Charles, and Department of Computer Science, National University of Ireland, Maynooth, Maynooth Co. Kildare. Noncontact simultaneous dual wavelength photoplethysmography: A further step toward noncontact pulse oximetry. United States: N. p., 2007. Web. doi:10.1063/1.2724789.
Humphreys, Kenneth, Ward, Tomas, Markham, Charles, & Department of Computer Science, National University of Ireland, Maynooth, Maynooth Co. Kildare. Noncontact simultaneous dual wavelength photoplethysmography: A further step toward noncontact pulse oximetry. United States. doi:10.1063/1.2724789.
Humphreys, Kenneth, Ward, Tomas, Markham, Charles, and Department of Computer Science, National University of Ireland, Maynooth, Maynooth Co. Kildare. Sun . "Noncontact simultaneous dual wavelength photoplethysmography: A further step toward noncontact pulse oximetry". United States. doi:10.1063/1.2724789.
@article{osti_20953433,
title = {Noncontact simultaneous dual wavelength photoplethysmography: A further step toward noncontact pulse oximetry},
author = {Humphreys, Kenneth and Ward, Tomas and Markham, Charles and Department of Computer Science, National University of Ireland, Maynooth, Maynooth Co. Kildare},
abstractNote = {We present a camera-based device capable of capturing two photoplethysmographic (PPG) signals at two different wavelengths simultaneously, in a remote noncontact manner. The system comprises a complementary metal-oxide semiconductor camera and dual wavelength array of light emitting diodes (760 and 880 nm). By alternately illuminating a region of tissue with each wavelength of light, and detecting the backscattered photons with the camera at a rate of 16 frames/wavelength s, two multiplexed PPG wave forms are simultaneously captured. This process is the basis of pulse oximetry, and we describe how, with the inclusion of a calibration procedure, this system could be used as a noncontact pulse oximeter to measure arterial oxygen saturation (S{sub p}O{sub 2}) remotely. Results from an experiment on ten subjects, exhibiting normal S{sub p}O{sub 2} readings, that demonstrate the instrument's ability to capture signals from a range of subjects under realistic lighting and environmental conditions are presented. We compare the signals captured by the noncontact system to a conventional PPG signal captured concurrently from a finger, and show by means of a J. Bland and D. Altman [Lancet 327, 307 (1986); Statistician 32, 307 (1983)] test, the noncontact device to be comparable to a contact device as a monitor of heart rate. We highlight some considerations that should be made when using camera-based ''integrative'' sampling methods and demonstrate through simulation, the suitability of the captured PPG signals for application of existing pulse oximetry calibration procedures.},
doi = {10.1063/1.2724789},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 4,
volume = 78,
place = {United States},
year = {2007},
month = {4}
}