Advanced devices for near-infrared time-resolved spectroscopy and optical computed tomography: high-sensitive/fast PMT, high-power PLP, miniaturized CFD/TAC module, and high-speed multichannel signa

Motoki Oda; Yutaka Yamashita; Hirofumi Kan; Hirofumi Miyajima; Akihiro Sawaki; Tetsuhisa Nakano; Seiji Suzuki; Akihiro Suzuki; Keiji Shimizu; Shinichi Muramatsu; N. Sugiura; Kazuyoshi Ohta; Yutaka Tsuchiya

doi:10.1117/12.280224

18 August 1997 Advanced devices for near-infrared time-resolved spectroscopy and optical computed tomography: high-sensitive/fast PMT, high-power PLP, miniaturized CFD/TAC module, and high-speed multichannel signa

Motoki Oda, Yutaka Yamashita, Hirofumi Kan, Hirofumi Miyajima, Akihiro Sawaki, Tetsuhisa Nakano, Seiji Suzuki, Akihiro Suzuki, Keiji Shimizu, Shinichi Muramatsu, N. Sugiura, Kazuyoshi Ohta, Yutaka Tsuchiya

Author Affiliations +

Proceedings Volume 2979, Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II; (1997) https://doi.org/10.1117/12.280224
Event: BiOS '97, Part of Photonics West, 1997, San Jose, CA, United States

Abstract

We have developed a 64-channel time-resoled spectroscopy (TRS) system based on a time-correlated single photon counting (TCPC) method to achieve near infrared spectroscopy and/or optical computed tomography (CT) for clinical applications. This system employs advanced devices such as a high power picosecond light pulser (PLP), a high sensitive/fast photomultiplier tube (PMT) and a high speed signal processing circuit. The PLP offers an average optical power of around 0.25 mW, and the PMT has a quantum efficiency greater than 2% at 800 nm. The signal processing circuit is composed of miniaturized CFD/TAC modules and signal acquisition unit with 1 MHz ADC, and provides 64 independent TCPC circuits for time- of-flight measurement. System performance was estimated by measuring transmitted and reflected light passing through tissue-like phantom models simulating the human breast and infant head. We concluded that this system has the sufficient performance for optical CT utilizing time-of-flight measurement.

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Motoki Oda, Yutaka Yamashita, Hirofumi Kan, Hirofumi Miyajima, Akihiro Sawaki, Tetsuhisa Nakano, Seiji Suzuki, Akihiro Suzuki, Keiji Shimizu, Shinichi Muramatsu, N. Sugiura, Kazuyoshi Ohta, and Yutaka Tsuchiya "Advanced devices for near-infrared time-resolved spectroscopy and optical computed tomography: high-sensitive/fast PMT, high-power PLP, miniaturized CFD/TAC module, and high-speed multichannel signa", Proc. SPIE 2979, Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II, (18 August 1997); https://doi.org/10.1117/12.280224

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