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Neurophotonics

Characterization of a fiber-less, multichannel optical probe for continuous wave functional near-infrared spectroscopy based on silicon photomultipliers detectors: in-vivo assessment of primary sensorimotor response
Author(s): Antonio M. Chiarelli; Sebania Libertino; Filippo Zappasodi; Massimo C. Mazzillo; Francesco Di Pompeo; Arcangelo Merla; Salvatore A. Lombardo; Giorgio Piero Fallica
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Paper Abstract

We report development, testing, and in vivo characterization of a multichannel optical probe for continuous wave (CW) functional near-infrared spectroscopy (fNIRS) that relies on silicon photomultipliers (SiPMs) detectors. SiPMs are cheap, low voltage, and robust semiconductor light detectors with performances analogous to photomultiplier tubes (PMTs). In contrast with PMTs, SiPMs allow direct contact with the head and transfer of the analog signals through thin cables greatly increasing the system flexibility avoiding optical fibers. The coupling of SiPMs and light-emitting diodes (LEDs) made the optical probe lightweight and robust against motion artifacts. After characterization of SiPM performances, which was proven to provide a noise equivalent power below 3 fW, the apparatus was compared through an in vivo experiment to a commercial system relying on laser diodes, PMTs, and optical fibers for light probing and detection. The optical probes were located over the primary sensorimotor cortex and the similarities between the hemodynamic responses to the contralateral motor task were assessed. When compared to other state-of-the-art wearable fNIRS systems, where photodiode detectors are employed, the single photon sensitivity and dynamic range of SiPMs can fully exploit the long and variable interoptode distances needed for correct estimation of brain hemodynamics using CW-fNIRS.

Paper Details

Date Published: 27 September 2017
PDF: 10 pages
Neurophoton. 4(3) 035002 doi: 10.1117/1.NPh.4.3.035002
Published in: Neurophotonics Volume 4, Issue 3
Show Author Affiliations
Antonio M. Chiarelli, Univ. degli Studi G. d'Annunzio Chieti-Pescara (Italy)
Sebania Libertino, Istituto per la Microelettronica e Microsistemi (Italy)
Filippo Zappasodi, Univ. degli Studi G. d'Annunzio Chieti Pescara (Italy)
Massimo C. Mazzillo, STMicroelectronics (Italy)
Francesco Di Pompeo, Univ. degli Studi G. d'Annunzio Chieti Pescara (Italy)
Arcangelo Merla, Univ. degli Studi G. d'Annunzio Chieti Pescara (Italy)
Salvatore A. Lombardo, Istituto per la Microelettronica e Microsistemi (Italy)
Giorgio Piero Fallica, STMicroelectronics (Italy)


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