Microcontroller-based digital front-end for Near Infrared Spectroscopy on human tissues

Giovanni Danese, Mario Giardini, Giovanni G. Guizzetti, Francesco Leporati

Research output: Contribution to conferencePoster

Abstract

Near Infrared Spectroscopy (NIRS) can be employed to noninvasively and continuously measure in-vivo local changes in hemodynamics and oxygenation of human tissues. Monitoring of these parameters is particularly useful both for basic research and during surgery, when a continuous and real-time measurement can help to avoid permanent damages to the tissues.
We developed a modular acquisition system in which each subsystem, from the case to the single acquisition front-end is designed to meet all the requirements of a research-grade instrument, dedicated to intraoperatory measurements.
Part of the modules of the acquisition system has been dedicated to multipoint NIRS. A module prototype has been developed, which is able to control four LED sources and two detectors. On each front-end the source and the collected signal are processed by a RISC microcontroller through a digital lock-in scheme. Signals from different modules are multiplexed on a bus and sent to a workstation (integrated on the instrument) to be further processed and visualized.
Preliminary tests of the prototype on tourniquet-induced forearm ischaemia show adequate detectivity and time response. The operating parameters derived from the prototype will be employed in the design of a high channel count module, which will exploit the capabilities of a digital signal processor (DSP), for brain oxygenation monitoring.
Original languageEnglish
Publication statusPublished - 15 Jun 1999
EventINFMeeting 1999 - Catania, Italy
Duration: 14 Jun 199918 Jun 1999

Conference

ConferenceINFMeeting 1999
CountryItaly
CityCatania
Period14/06/9918/06/99

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Danese, G., Giardini, M., Guizzetti, G. G., & Leporati, F. (1999). Microcontroller-based digital front-end for Near Infrared Spectroscopy on human tissues. Poster session presented at INFMeeting 1999, Catania, Italy.