Microcontroller-based digital front-end for near-infrared spectroscopy

Mario E. Giardini; Mario Corti; Giovanni Guido Guizzetti; Paolo Lago; Andrea Gelmetti; Giovanni Danese

doi:10.1117/12.384921

3 May 2000 Microcontroller-based digital front-end for near-infrared spectroscopy

Mario E. Giardini, Mario Corti, Giovanni Guido Guizzetti, Paolo Lago, Andrea Gelmetti, Giovanni Danese

Proceedings Volume 3911, Biomedical Diagnostic, Guidance, and Surgical-Assist Systems II; (2000) https://doi.org/10.1117/12.384921
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States

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.

Citation Download Citation

Mario E. Giardini, Mario Corti, Giovanni Guido Guizzetti, Paolo Lago, Andrea Gelmetti, and Giovanni Danese "Microcontroller-based digital front-end for near-infrared spectroscopy", Proc. SPIE 3911, Biomedical Diagnostic, Guidance, and Surgical-Assist Systems II, (3 May 2000); https://doi.org/10.1117/12.384921

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