(a) Measured transmittance and (b) reflectance of breast cancer phantoms containing MWNTs of varying concentration (0.01, 0.05, and 0.10 mg/ml) for the wavelength range of 400–1300 nm. Absorption coefficient and reduced scattering coefficient of breast cancer phantoms containing (c,d) MWNTs, (e,f) SWNTs, and (g,h) SWNHs of varying concentration determined with the IAD method for the wavelength range of 400–1300 nm.