City Research Online

Abstract

The acquisition of reliable and meaningful photoplethysmographic (PPG) signals using conventional pulse oximetry technology may be compromised by conditions of low tissue perfusion. We have developed a novel ‘trans-reflectance’ PPG measurement system which combines reflectance and transmittance together into a single mode. For comparison purposes the system also enables the independent display of reflectance and
transmittance PPG signals simultaneously. Preliminary experiments were performed on volunteers to assess the performance of the probe, where, artificial hypoperfusion was created in individuals and data was recorded with the newly developed trans-reflectance photoplethysmographic mode, and the conventional
transmittance and reflectance PPG modes. The PPG signals recorded during hypoperfusion using the trans-reflectance mode were of good quality with higher signal-to-noise ratio than those obtained from the transmittance and reflectance modes.

Publication Type:	Article
Additional Information:	© 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Publisher Keywords:	Photoplethysmography, trans-reflectance, hypoperfusion, pulse oximetry.
Subjects:	R Medicine T Technology > TA Engineering (General). Civil engineering (General)
Departments:	School of Science & Technology School of Science & Technology > Engineering

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