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Proceedings Paper

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
Author(s): 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
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Paper 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.

Paper Details

Date Published: 18 August 1997
PDF: 9 pages
Proc. SPIE 2979, Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II, (18 August 1997); doi: 10.1117/12.280224
Show Author Affiliations
Motoki Oda, Hamamatsu Photonics KK (Japan)
Yutaka Yamashita, Hamamatsu Photonics KK (Japan)
Hirofumi Kan, Hamamatsu Photonics KK (Japan)
Hirofumi Miyajima, Hamamatsu Photonics KK (Japan)
Akihiro Sawaki, Hamamatsu Photonics KK (Japan)
Tetsuhisa Nakano, Hamamatsu Photonics KK (Japan)
Seiji Suzuki, Hamamatsu Photonics KK (Japan)
Akihiro Suzuki, Hamamatsu Photonics KK (Japan)
Keiji Shimizu, Hamamatsu Photonics KK (Japan)
Shinichi Muramatsu, Hamamatsu Photonics KK (Japan)
N. Sugiura, Hamamatsu Photonics KK (Japan)
Kazuyoshi Ohta, Hamamatsu Photonics KK (Japan)
Yutaka Tsuchiya, Hamamatsu Photonics KK (Japan)

Published in SPIE Proceedings Vol. 2979:
Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II
Britton Chance; Robert R. Alfano, Editor(s)

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