Measurement of tissue optical properties in the 400 to 700 nm range to assess light penetration depths for laser treatment of upper tract urothelial carcinomas.

Significance: For therapeutic approaches for upper tract urothelial carcinomas, the absorption and reduced scattering coefficients of these tissues are essential parameters to quantitatively evaluate the distribution of light treatment effects.

Aim: The and spectra of the human ureter, fatty tissue, ureteral and renal pelvic carcinomas, and porcine ureter and fatty tissue are measured over 400 to 700 nm to evaluate projected light penetration depths .

Approach: The optical properties were determined with a double integrating sphere optical system and inverse Monte Carlo methods.