 Due to the recognized significance of noninvasive techniques of imaging in the medical field, especially for imaging in vivo blood flow, OCT has become a popular research topic recently.Not only conserving the excellence of OCT, Doppler Optical Coherence Tomography also combines the Doppler effect principle as a whole, which results in tomographic images with high resolution with static and moving constituents.In 1991, the first use of coherence gating to localized flow velocity was reported.