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Proceedings Paper

Microcontroller-based digital front-end for near-infrared spectroscopy
Author(s): Mario E. Giardini; Mario Corti; Giovanni Guido Guizzetti; Paolo Lago; Andrea Gelmetti; Giovanni Danese
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Paper Abstract

Near IR Spectroscopy (NIRS) can be employed to noninvasively and continuously measure in-vivo local changes in haemodynamics 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 damage to the tissues. We present 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 a RISC microcontroller performs source and detector multiplexing with a digital correlation technique. A number of such modules can be independently addressed through a bus by a PC-based workstation for data collection, processing and visualization. Preliminary test of the prototype on tourniquet-induced forearm ischemia 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, for spatially mapped brain oxygenation monitoring.

Paper Details

Date Published: 3 May 2000
PDF: 7 pages
Proc. SPIE 3911, Biomedical Diagnostic, Guidance, and Surgical-Assist Systems II, (3 May 2000); doi: 10.1117/12.384921
Show Author Affiliations
Mario E. Giardini, INFM (Italy)
Mario Corti, INFM and Univ. degli Studi di Milano (Italy)
Giovanni Guido Guizzetti, INFM and Univ. di Pavia (Italy)
Paolo Lago, INFM and Policlinico San Matteo (Italy)
Andrea Gelmetti, INFM and Policlinico San Matteo (Italy)
Giovanni Danese, INFM and Univ. di Pavia (Italy)

Published in SPIE Proceedings Vol. 3911:
Biomedical Diagnostic, Guidance, and Surgical-Assist Systems II
Tuan Vo-Dinh; Warren S. Grundfest; David A. Benaron, Editor(s)

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