Towards time-domain diffuse optics with extreme photon rate

L. Di Sieno; T. Talala; E. Avanzi; I. Nissinen; J. Nissinen; A. Dalla Mora

doi:10.1117/12.2669264

9 August 2023 Towards time-domain diffuse optics with extreme photon rate

L. Di Sieno, T. Talala, E. Avanzi, I. Nissinen, J. Nissinen, A. Dalla Mora

Proceedings Volume 12628, Diffuse Optical Spectroscopy and Imaging IX; 1262815 (2023) https://doi.org/10.1117/12.2669264
Event: European Conferences on Biomedical Optics, 2023, Munich, Germany

Abstract

We present the application to time-domain diffuse optics of a device composed of 8x256 CMOS SPAD array with 256 7-bit time-to-digital converters. Thanks to its structure and despite the limitation on the maximum repetition rate of the laser (2 MHz), it has been demonstrated to be suitable for fast acquisitions (10 ms) provided that a high photon count-rate is used and pile-up distortion is corrected. We demonstrate that high penetration depth (>30 mm) and good linearity in absorption coefficient retrieval can be achieved. Finally, we were able to clearly record the heart beat in a resting state forehead measurement.

Citation Download Citation

L. Di Sieno, T. Talala, E. Avanzi, I. Nissinen, J. Nissinen, and A. Dalla Mora "Towards time-domain diffuse optics with extreme photon rate", Proc. SPIE 12628, Diffuse Optical Spectroscopy and Imaging IX, 1262815 (9 August 2023); https://doi.org/10.1117/12.2669264

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