Proc. SPIE. 9327, Optical Elastography and Tissue Biomechanics II
KEYWORDS: Actuators, Signal to noise ratio, Coherence (optics), Optical coherence tomography, Elastography, Signal analyzers, Motion measurement, Phase shifts, Current controlled current source, Correlation function
A combined correlation method is introduced to optical coherence elastography for axial displacement estimation. Its performance is compared with that of amplitude correlation tracking and phase shift estimation. Relative sensitivities to small (sub-micron), and large (pixel-scale) axial displacements are analysed for a Perspex test object and gelatine phantom.
The combined correlation method exhibited good overall performance, with a larger dynamic range than phase shift estimation and higher sensitivity than amplitude correlation tracking.