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
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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.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Motoki Oda, Motoki Oda, Yutaka Yamashita, Yutaka Yamashita, Hirofumi Kan, Hirofumi Kan, Hirofumi Miyajima, Hirofumi Miyajima, Akihiro Sawaki, Akihiro Sawaki, Tetsuhisa Nakano, Tetsuhisa Nakano, Seiji Suzuki, Seiji Suzuki, Akihiro Suzuki, Akihiro Suzuki, Keiji Shimizu, Keiji Shimizu, Shinichi Muramatsu, Shinichi Muramatsu, N. Sugiura, N. Sugiura, Kazuyoshi Ohta, Kazuyoshi Ohta, Yutaka Tsuchiya, 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); doi: 10.1117/12.280224; https://doi.org/10.1117/12.280224
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