Fig. 6.

3D rendering of the simulated fluence distribution around an optical fiber with the proximal end of a 2-cm-long diffusing segment of the fiber positioned at $z=0.3\mathrm{cm}$ above the boundary separating the tumor and normal tissue regions. Tumor optical properties were set to ${\mu }_a=0.062{\mathrm{mm}}^{-1}$, ${\mu }_s^{\prime }=1.34{\mathrm{mm}}^{-1}$, and $g=0.85$, which correspond to values extracted from an urothelial carcinoma at 630 nm, as shown in Fig. 5(c) and 5(d). Voxel size was $0.026\times 0.026\times 0.026{\mathrm{cm}}^3$.