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Proceedings Paper

Infrared laser transillumination CT imaging system using parallel fiber arrays and optical switches for finger joint imaging
Author(s): Yoshiaki Sasaki; Ryota Emori; Hiroki Inage; Masaki Goto; Ryo Takahashi; Tetsuya Yuasa; Hiroshi Taniguchi; Balasigamani Devaraj; Takao Akatsuka
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Paper Abstract

The heterodyne detection technique, on which the coherent detection imaging (CDI) method founds, can discriminate and select very weak, highly directional forward scattered, and coherence retaining photons that emerge from scattering media in spite of their complex and highly scattering nature. That property enables us to reconstruct tomographic images using the same reconstruction technique as that of X-Ray CT, i.e., the filtered backprojection method. Our group had so far developed a transillumination laser CT imaging method based on the CDI method in the visible and near-infrared regions and reconstruction from projections, and reported a variety of tomographic images both in vitro and in vivo of biological objects to demonstrate the effectiveness to biomedical use. Since the previous system was not optimized, it took several hours to obtain a single image. For a practical use, we developed a prototype CDI-based imaging system using parallel fiber array and optical switches to reduce the measurement time significantly. Here, we describe a prototype transillumination laser CT imaging system using fiber-optic based on optical heterodyne detection for early diagnosis of rheumatoid arthritis (RA), by demonstrating the tomographic imaging of acrylic phantom as well as the fundamental imaging properties. We expect that further refinements of the fiber-optic-based laser CT imaging system could lead to a novel and practical diagnostic tool for rheumatoid arthritis and other joint- and bone-related diseases in human finger.

Paper Details

Date Published: 6 May 2004
PDF: 10 pages
Proc. SPIE 5368, Medical Imaging 2004: Physics of Medical Imaging, (6 May 2004); doi: 10.1117/12.534489
Show Author Affiliations
Yoshiaki Sasaki, Yamagata Univ. (Japan)
Ryota Emori, Yamagata Univ. (Japan)
Hiroki Inage, Yamagata Univ. (Japan)
Masaki Goto, Yamagata Univ. (Japan)
Ryo Takahashi, Yamagata Univ. (Japan)
Tetsuya Yuasa, Yamagata Univ. (Japan)
Hiroshi Taniguchi, Iwate Univ. (Japan)
Balasigamani Devaraj, New Focus, Inc. (United States)
Takao Akatsuka, Yamagata Univ. (Japan)

Published in SPIE Proceedings Vol. 5368:
Medical Imaging 2004: Physics of Medical Imaging
Martin J. Yaffe; Michael J. Flynn, Editor(s)

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