Fig. 1. Multispectral Monte Carlo simulation model of vascular tissue mimics

Fig. 2. Monte Carlo simulation results. (a) Backscattering spectra at each blood oxygen saturation; (b) blood-tissue contrast spectra

Fig. 3. AHP assigns weights to influencing factors

Fig. 4. Disturbance deviation fraction of various influencing factors. (a) Error; (b) controllable conditions and weighted composite score

Fig. 5. Final score for each wavelength of RGB light. (a) Blue and green light; (b) red light

Fig. 6. Blood oxygen analysis results in simulation. (a) In equidistant state; (b) in non-equidistant state

Fig. 7. Diagram of experimental setup

Fig. 8. Multispectral images of phantom at four wavelengths of 450 nm, 525 nm, 630 nm, and 660 nm captured by laboratory endoscope. (a)-(d) d=2 cm,ξSO2=18%; (e)-(h) d=2 cm,ξSO2=98%; (i)-(l) d=3 cm,ξSO2=98%

Fig. 9. Analysis of accuracy of blood oxygen saturation calculation formula. (a) In equidistant state; (b) in non-equidistant state

Fig. 10. Deviation of blood oxygen saturation of different methods at 99% confidence level