Robust non-contact peripheral oxygenation saturation measurement using smartphone-enabled imaging photoplethysmography | JoVE Visualize

Robust non-contact peripheral oxygenation saturation measurement using smartphone-enabled imaging photoplethysmography

Zhiyuan Sun^1,2, Qinghua He^1,2, Yuandong Li¹

¹Department of Bioengineering, University of Washington, Seattle, Washington 98105, USA.

Biomedical Optics Express|April 2, 2021

View abstract on PubMed

Summary

This study presents a smartphone method for non-contact peripheral oxygen saturation (SpO2) estimation using imaging photoplethysmography. The novel approach significantly improves accuracy compared to traditional methods.

Area of Science:

Biomedical Engineering
Medical Imaging
Remote Sensing

Background:

Peripheral oxygen saturation (SpO2) monitoring is crucial for patient care.
Existing methods often require physical contact and specialized devices.
Non-contact SpO2 estimation offers a convenient and accessible alternative.

Purpose of the Study:

To develop and validate a robust, non-contact method for SpO2 estimation using smartphone imaging photoplethysmography.
To enhance SpO2 measurement accuracy by employing a multiple linear regression algorithm.
To compare the performance of the proposed smartphone method against a medical-grade pulse oximeter.

Main Methods:

Utilized smartphone camera as a remote sensor and flashlight for illumination.
Applied a ratio of ratios method between green and red color channels.
Introduced a multiple linear regression algorithm incorporating reflectance images and calibration coefficients.

Main Results:

Achieved an overall estimated error of 0.029 ± 1.141% compared to a reference pulse oximeter.
Demonstrated a 43% improvement in accuracy over the conventional ratio of ratios method.
Maintained a data sampling time of 2 seconds, comparable to commercial devices.

Conclusions:

The proposed smartphone-based imaging photoplethysmography method provides accurate and robust non-contact SpO2 estimation.
This technology offers a significant advancement over traditional methods, enhancing accessibility and convenience.
Further validation in diverse clinical settings is warranted to explore its full potential.