Simultaneous estimation of arterial and venous oxygen saturation using a camera

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

2 Citaten (Scopus)


Optical monitoring of arterial blood oxygenation, SpO2, using cameras has recently been shown feasible by measuring the relative amplitudes of the remotely sensed PPG waveforms captured at different wavelengths. SvO2 measures the venous blood oxygenation which together with SpO2 provides an indication of tissue oxygen consumption. In contrast to SpO2 it usually still requires a blood sample from a pulmonary artery catheter. In this work we present a method which suggests simultaneous estimation of SpO2 and SvO2 with a camera. Contrary to earlier work, our method does not require external cuffs leading to better usability and improved comfort. Since the arterial blood varies synchronously with the heart rate, all frequencies outside the heart rate band are typically filtered out for SpO2 measurements. For SvO2 estimation, we include intensity variations in the respiratory frequency range since respiration modulates venous blood due to intrathoracic pressure variations in the chest and abdomen. Consequently, under static conditions, the two dominant components in the PPG signals are respiration and pulse. By measuring the amplitude ratios of these components, it seems possible to monitor both SpO2 and SvO2 continuously. We asked healthy subjects to follow an auditory breathing pattern while recording the face and hand. Results show a difference in estimated SpO2 and SvO2 values in the range 5-30 percent for both anatomical locations, which is normal for healthy people. This continuous, non-contact, method shows promise to alert the clinician to a change in patient condition sooner than SpO2 alone.

Originele taal-2Engels
TitelOptical Diagnostics and Sensing XVIII
SubtitelToward Point-of-Care Diagnostics
RedacteurenG.L. Coté
Plaats van productieBellingham
ISBN van elektronische versie9781510614871
ISBN van geprinte versie978-1-5106-1487-1
StatusGepubliceerd - 20 feb 2018
EvenementOptical Diagnostics and Sensing XVIII: Toward Point-of-Care Diagnostics - San Francisco, Verenigde Staten van Amerika
Duur: 29 jan 201830 jan 2018

Publicatie series

NaamProceedings of SPIE
ISSN van geprinte versie0277-786X


CongresOptical Diagnostics and Sensing XVIII: Toward Point-of-Care Diagnostics
LandVerenigde Staten van Amerika
StadSan Francisco

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