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.
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 language | English |
|---|---|
| Publication status | Published - 15 Jun 1999 |
| Event | INFMeeting 1999 - Catania, Italy Duration: 14 Jun 1999 → 18 Jun 1999 |
Conference
| Conference | INFMeeting 1999 |
|---|---|
| Country/Territory | Italy |
| City | Catania |
| Period | 14/06/99 → 18/06/99 |