Correlation characteristics of optical coherence tomography images of turbid media with statistically inhomogeneous optical parameters

► Random variations of absorption and backscattering cause OCT signal fluctuations. ► We study the effect of turbid medium structural inhomogeneity on OCT image formation. ► We develop analytical model for OCT signal correlation statistics in random medium. ► Corresponding fluctuations are found in OCT images of biotissues. ► Correlation parameters of biotissue inhomogeneities are estimated using our model.