Early Detection of Breast Cancer and Recurrence Using Near Infrared Time ResolvedSpectrophotometry

摘要

The techniques are employed to measure the optical absorption and scatteringfactors of breast tissue: (1) A pulse time device in which light at a low power is employed. The time delay in light propagation from the input to output of fiber optic couplers is related to the scattering factor and the rate of decay of emerging photons is related to the absorption factor. (2) Phase modulation, which is more convenient and rapid, measures the phase shift of a high frequency oscillating light of approximately the same power and wavelength used in the pulse time method.