Estimation and compensation of phase errors induced by axial bulk motion of sample in wavelength-sweeping parallel Fourier domain OCT

We report a new approach to correct image blurring due to the axial bulk motion of a sample in the wavelength-sweeping Fourier domain parallel OCT. This approach can estimate phase errors changing rapidly in time through direct measurements of the apparent axial shift during the sampling interval using common phase changes in parallel detection without additional hardware. To demonstrate the performance of the proposed algorithm, single reflection and multiple scattering sample were imaged with spectrally encoded line field OCT system, which is one of the wavelength-sweeping parallel OCT systems. In addition, we quantitatively demonstrated that even a small axial movement of the sample can cause serious image blur at high nonlinear degree of movement.