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Proceedings Paper

Discrimination between urinary tract tissue and urinary stones by fiber-optic-pulsed photothermal radiometry method in vivo
Author(s): Yuichiro Daidoh; Tsunenori Arai; Akira Suda; Makoto Kikuchi; Yukikuni Komine; Masaru Murai; Hiroshi Nakamura
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Paper Abstract

To minimize urotherial tissue injuries by false laser irradiation during the laser stones fragmentation, a novel fiber-optic analytical system was developed which was able to distinguish urotherial tissues from urinary stones in vivo. This system was composed of the fiber-optic pulsed photo-thermal radiometry (PPTR) system together with a thin-fiber endoscope. The ultraviolet Ar laser was employed as the excitation light source. The catheter of this system was 6F in diameter and consisted of SiO2 glass fiber (400 micrometers (phi) ) as an excitation line, an As-S glass fiber (400 micrometers (phi) ) as a detection line, and a thin-fiber endoscope (610 micrometers (phi) ). A urinary stone was introduced into the canine ureter uneter under general anesthesia. The catheter system was inserted through an opening of the ureter distal to the stone. The e-folding decay time of the PPTR waveform of which optical and/or thermal properties of the tissues and stones were characterized was measured in vivo. The e-folding decay times were significantly different between urinary stones and the canine ureter. These results suggest that the fiber-optic PPTR analysis might be significantly useful procedure to prevent urotherial tissue from false irradiation injuries in clinical laser stone fragmentation.

Paper Details

Date Published: 1 July 1991
PDF: 4 pages
Proc. SPIE 1421, Lasers in Urology, Laparoscopy, and General Surgery, (1 July 1991); doi: 10.1117/12.43917
Show Author Affiliations
Yuichiro Daidoh, Self-Defense Forces Central Hospital (Japan)
Tsunenori Arai, National Defense Medical College (Japan)
Akira Suda, National Defense Medical College (Japan)
Makoto Kikuchi, National Defense Medical College (Japan)
Yukikuni Komine, Self-Defense Forces Central Hospital (Japan)
Masaru Murai, National Defense Medical College (Japan)
Hiroshi Nakamura, National Defense Medical College (Japan)

Published in SPIE Proceedings Vol. 1421:
Lasers in Urology, Laparoscopy, and General Surgery
Graham M. Watson; Rudolf W. Steiner; Joseph J. Pietrafitta, Editor(s)

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