相关多普勒光学层析成像

Correlated Doppler optical coherence tomography

提出了基于互相关的多普勒OCT(correlated Doppler optical coherence tomography,CD-OCT)方法,能够有效的抑制噪声,实现低信噪比条件下的流速探测.对CD-OCT算法进行了详细的推导,分析了噪声的相关性对该算法结果的影响,最后基于谱域和时域联合探测方法(joint specral and time domain optical coherence tomography,STD-OCT)以及CD-OCT算法的对比实验证明了该算法能够进一步实现信噪比的提高,使测量的结果更为稳定.

A new method based cross-correlation technique（CD-OCT） is proposed to acquire and analyse the information about flow velocity with low signal-to-noise ratio（SNR） in spectral-domain optical coherence tomography（SD-OCT）.We theoretically study the procedure of this method,and analyse the correlation between the noises by computer simulation and experiment.The Doppler flow images reconstructed by CD-OCT are compared with those reconstructed by Joint spectral and time-domain optical coherence tomography （STD-OCT）.The results demonstrate that CD-OCT can significantly improve the SNR,thus rendering it suitable for the flow measurement in low SNR.