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Proceedings Paper

Optoelectronic telemetry of electrophysiological signals
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Paper Abstract

Transmission via diffused radiation is a technique which implements a mobile wireless link exploiting the ambient diffusion of light or infrared radiation it operates over short range distances and medium range bandwidth and is therefore attractive for a variety of in-vivo laboratory experiences involving stimulation and/or monitoring of different physiological parameters on freely-moving animals. In this paper the main features of the optoelectronic transmission are presented making a comparison with other approaches namely electric and fiberoptic cabling and RF links. The diffused channel is characterized in terms of attenuation bandwidth and S/N ratio showing that it is suitable for transmission of biological signals in a typical laboratory environment. A two-way transmission system is described that has been specifically designed for telemetry on small animals. The system consists of a pair of LED/photodiode transmitters and receivers. The mobile unit has been implemented in surface mount technology (SMT) to achieve adequate compactness. The link offers an accuracy of 0. 5in amplitude and a signal bandwidth from d. c. to 1KHz and operates for over 15 hours with two standard lithium batteries. This system is being routinary used for in-vivo polarographic determinations of brain neurotransmitters and their metabolites (DOPAC and 5-HIAA) on freely-moving rats. Moreover it is pointed out that the optoelectronic approach can eliminate the severe crosstalk interference which has so far prevented the concurrent pickup of low-level electrophysiological signals during polarographic determinations.

Paper Details

Date Published: 1 June 1990
PDF: 7 pages
Proc. SPIE 1355, Telecommunication for Health Care: Telemetry, Teleradiology, and Telemedicine, (1 June 1990); doi: 10.1117/12.23878
Show Author Affiliations
Valerio Annovazzi-Lodi, Univ. di Pavia (Italy)
Silvano Donati, Univ. di Pavia (Italy)

Published in SPIE Proceedings Vol. 1355:
Telecommunication for Health Care: Telemetry, Teleradiology, and Telemedicine
Rangaraj M. Rangayyan, Editor(s)

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