Wavelet transform-based method of compensating dispersion for high resolution imaging in SDOCT

The axial resolution is an important parameter in Optical Coherence Tomography (OCT). In OCT a broadband light source is used to achieve high axial resolution imaging. However the dispersion results in a broadening of the coherence envelope. The dispersion mismatch between reference and sample arms then needs to be minimized to achieve optimal axial resolution for OCT. In this work we propose a new numerical dispersion compensation method to obtain ultrahigh resolution in SDOCT, in which wavelet transform instead of Fourier transform is used to obtain the signal in different frequency domain. And a series of the phase signals of different interfaces of the sample can be obtained. Under the homogeneous medium approxiamtion, the phase signal is a linear function of the wave number. Thus based on linearization of the phase signal of different interface and the wave number, the axial resolution can be improved.