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Proceedings Paper

Time-gated single-photon avalanche diode for time-resolved diffuse reflectance at small source-detector separation
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Paper Abstract

We demonstrate the feasibility of time-resolved diffuse reflectance at small source-detector separations using a single-photon avalanche photodiode (SPAD) operated in time-gated mode. Photon time distributions at an interfiber distance of 0.2 cm were obtained on tissue phantoms with a reduced scattering coefficient of 10 cm-1, and an absorption coefficient of 0.1 cm-1, with a dynamic range of 106 and collecting photons at arrival times up to 4 ns. By time-gating the initial photons, carrying information mainly from superficial layers, it is possible to detect longer lived photons that have explored deeper depths even at almost null interfiber distances. The proposed approach should provide higher number of photons at any arrival time, higher contrast, and better spatial resolution as compared to longer interfiber distances.

Paper Details

Date Published: 15 October 2007
PDF: 5 pages
Proc. SPIE 6771, Advanced Photon Counting Techniques II, 67710J (15 October 2007); doi: 10.1117/12.731778
Show Author Affiliations
Alessandro Torricelli, ULTRAS-INFM-CNR and INF-CNR, Politecnico di Milano (Italy)
Antonio Pifferi, ULTRAS-INFM-CNR and INF-CNR, Politecnico di Milano (Italy)
Loreno Spinelli, ULTRAS-INFM-CNR and INF-CNR, Politecnico di Milano (Italy)
Davide Contini, ULTRAS-INFM-CNR and INF-CNR, Politecnico di Milano (Italy)
Rinaldo Cubeddu, ULTRAS-INFM-CNR and INF-CNR, Politecnico di Milano (Italy)
Alberto Tosi, Politecnico di Milano (Italy)
Alberto Dalla Mora, Politecnico di Milano (Italy)
Franco Zappa, Politecnico di Milano (Italy)
Sergio Cova, Politecnico di Milano (Italy)


Published in SPIE Proceedings Vol. 6771:
Advanced Photon Counting Techniques II
Wolfgang Becker, Editor(s)

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