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

Alessandro Torricelli; Antonio Pifferi; Loreno Spinelli; Davide Contini; Rinaldo Cubeddu; Alberto Tosi; Alberto Dalla Mora; Franco Zappa; Sergio Cova

doi:10.1117/12.731778

15 October 2007 Time-gated single-photon avalanche diode for time-resolved diffuse reflectance at small source-detector separation

Alessandro Torricelli, Antonio Pifferi, Loreno Spinelli, Davide Contini, Rinaldo Cubeddu, Alberto Tosi, Alberto Dalla Mora, Franco Zappa, Sergio Cova

Author Affiliations +

Proceedings Volume 6771, Advanced Photon Counting Techniques II; 67710J (2007) https://doi.org/10.1117/12.731778
Event: Optics East, 2007, Boston, MA, United States

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.

Citation Download Citation

Alessandro Torricelli, Antonio Pifferi, Loreno Spinelli, Davide Contini, Rinaldo Cubeddu, Alberto Tosi, Alberto Dalla Mora, Franco Zappa, and Sergio Cova "Time-gated single-photon avalanche diode for time-resolved diffuse reflectance at small source-detector separation", Proc. SPIE 6771, Advanced Photon Counting Techniques II, 67710J (15 October 2007); https://doi.org/10.1117/12.731778

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