Assessment of voiding function by endoscopic imaging-a preliminary report

Tatsuo Igarashi, Satoki Zenbutsu, Yukio Naya, Takuro Ishii, Wen Wei Yu, Tomonori Yamanishi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We report a novel method of reconstructing the 3D structure of the prostatic urethra and measuring its elasticity using endoscopic video images, and discuss their relation to clinical relevancy. Information regarding pixel color and brightness in the endoscopic video image is converted to relative distance between the object and the light source. An opened, 3D image of the prostatic urethra is obtained from a video image captured by the endoscope as it is slowly pulled through the urethra. The elasticity of the urethra is determined by recording a video image of the endoscope fixed in the prostatic urethra, with and without irrigation under water pressure of approximately 80 cm H2O. Angulation of the prostatic urethra is estimated by the number of intersections between the outline of protruded prostate and the midline of the urethra in patients with severe voiding dysfunction scheduled for transurethral resection of prostate, and in those scheduled for transurethral resection of bladder tumor without apparent discomfort during urination. The number of intersections showed a relationship with voiding symptoms. In conclusion, reconstruction of the 3D structure of the prostatic urethra from endoscopic video images is a feasible method that shows promise for estimating the mechanism of voiding dysfunction.

Original languageEnglish
Pages (from-to)609-620
Number of pages12
JournalJournal of Mechanics in Medicine and Biology
Volume9
Issue number4
DOIs
Publication statusPublished - 2009 Dec 1
Externally publishedYes

Keywords

  • Elasticity of the urethra
  • Endoscopy
  • Opened image of the urethra
  • Prostatic urethra
  • Three-dimensional image

ASJC Scopus subject areas

  • Biomedical Engineering

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