Discrimination between urinary tract tissue and urinary stones by fiber optic pulsed photo-thermal radiometry method in vivo

Yuichiro Daidoh, Tsunenori Arai, Akira Suda, Makoto Kikuchi, Yukikuni Komine, Masaru Murai, Hiroshi Nakamura

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


To minimize urotherial tissue injuries by false laser irradiation during the laser stones fragmentation, we developed a novel fiber-optic analytical system 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 (400μmφ) as an excitation line, an As-S glass fiber (400μmφ) as a detection line, and a thin-fiber endoscope (610μmφ). A urinary stone was introduced into the canine ureter 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.

Original languageEnglish
Pages (from-to)120-123
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1991
Externally publishedYes
EventProceedings of Lasers in Urology, Laparoscopy, and General Surgery - Los Angeles, CA, USA
Duration: 1991 Jan 211991 Jan 23

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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