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Proceedings Paper

Development of qualitative near infrared vascular imaging system with tuned aperture computed tomography
Author(s): Tatsuhiko Matsushita; Toshiaki Miyati; Kazuya Nakayama; Takashi Hamaguti; Yoshihiko Hayakawa; Allan G. Farman; Yuzo Kikuchi
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Paper Abstract

We developed a novel system for imaging and qualitative analysis of surface vessels using near infrared (NIR) radiation with tuned aperture computed tomography (TACT®), even if the NIR cannot transmit through thick regions. NIR-sensitive CCD camera was surrounded by sixty light emitting diodes (alternating wavelengths of 700 nm and 810 nm), and could only detect the NIR from the subcutaneous tissue. We obtained multiple near infrared projections of surface vessels at each wavelength in accordance with the optical aperture theory within one second. Then, we created tomograms using the TACT program, and determined the venous oxygenation index (VOI), which reflected the oxygen saturation level, calculated from the image signals at each wavelength. This system produced thinner NIR tomograms under 0.5 mm. The change in VOI after load test calculated from NIR tomograms was more sensitive than that from NIR images without tomography. Our novel system makes it possible to non-invasively obtain NIR tomograms and accurately analyze changes in oxygen saturation.

Paper Details

Date Published: 22 March 2007
PDF: 7 pages
Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65103G (22 March 2007); doi: 10.1117/12.709241
Show Author Affiliations
Tatsuhiko Matsushita, Juntendo Univ. (Japan)
Kanazawa Univ. (Japan)
Toshiaki Miyati, Kanazawa Univ. (Japan)
Kazuya Nakayama, Kanazawa Univ. (Japan)
Takashi Hamaguti, Kanazawa Univ. (Japan)
Yoshihiko Hayakawa, Tokyo Dental College (Japan)
Allan G. Farman, Louisville Univ. (United States)
Yuzo Kikuchi, Kanazawa Univ. (Japan)


Published in SPIE Proceedings Vol. 6510:
Medical Imaging 2007: Physics of Medical Imaging
Jiang Hsieh; Michael J. Flynn, Editor(s)

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