Optoelectronic telemetry of electrophysiological signals

Valerio Annovazzi-Lodi; Silvano Donati

doi:10.1117/12.23878

1 June 1990 Optoelectronic telemetry of electrophysiological signals

Proceedings Volume 1355, Telecommunication for Health Care: Telemetry, Teleradiology, and Telemedicine; (1990) https://doi.org/10.1117/12.23878
Event: Telecommunication for Health Care: Telemetry, Teleradiology, and Telemedicine, 1990, Calgary, Canada

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.

Citation Download Citation

Valerio Annovazzi-Lodi and Silvano Donati "Optoelectronic telemetry of electrophysiological signals", Proc. SPIE 1355, Telecommunication for Health Care: Telemetry, Teleradiology, and Telemedicine, (1 June 1990); https://doi.org/10.1117/12.23878

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