  A robust model for simulating speckle pattern evolution in optical coherence
tomography (OCT) depending on the OCT system parameters and tissue deformation
is reported. The model is based on application of close to reality procedures
used in spectral-domain OCT scanners. It naturally generates images reproducing
properties of real images in spectral-domain OCT, including the pixelized
structure and finite depth of unambiguous imaging, influence of the optical
spectrum shape, dependence on the optical wave frequency and coherence length,
influence of the tissue straining, etc. Good agreement with generally accepted
speckle features and properties of real OCT images is demonstrated.
