Abstract

In optical coherence tomography (OCT), lateral motion is determined either by speckle tracking or by multi-aperture Doppler OCT. Here we show that both methods may provide incorrect results because, outside the focal plane, non-uniform axial motion is misinterpreted as lateral motion. First, we demonstrate the existence of this artifact by means of a simulation for speckle tracking. Then the physical origin of the artifact and its mathematical relation to defocus and axial motion are explained. It is shown that speckle tracking and multi-aperture Doppler OCT are equally affected by the artifact, which has a considerable effect, even for a defocus of less than one Rayleigh length.

© 2019 Optical Society of America

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Supplementary Material (1)

NameDescription
» Visualization 1       Simulation of the speckle motion artifact caused by non-uniform axial motion and defocused imaging. The image of the single scatterer does not move, which is consistent with the motion of the sample. The surrounding speckle pattern however moves late

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