Chi Ting-Ta, Lee Cheng-Kuang, Wu Chiung-Ting, Yang Chih-Chung, Tsai Meng-Tsan, Chiang Chun-Ping
Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, Taiwan.
Opt Express. 2011 Dec 19;19(27):26117-31. doi: 10.1364/OE.19.026117.
An improved image processing procedure for suppressing the phase noise due to a motion artifact acquired during optical coherence tomography scanning and effectively illustrating the blood vessel distribution in a living tissue is demonstrated. This new processing procedure and the widely used procedure for micro-angiography application are based on the selection of high-frequency components in the spatial-frequency spectrum of B-mode scanning (x-space), which are contributed from the image portions of moving objects. However, by switching the processing order between the x-space and k-space, the new processing procedure shows the superior function of effectively suppressing the phase noise due to a motion artifact. After the blood vessel positions are precisely acquired based on the new processing procedure, the projected blood flow speed can be more accurately calibrated based on a previously reported method. The demonstrated new procedure is useful for clinical micro-angiography application, in which a stepping motor of generating motion artifacts is usually used in the scanning probe.
展示了一种改进的图像处理程序，该程序可抑制光学相干断层扫描期间获取的运动伪影引起的相位噪声，并有效地显示活组织中的血管分布。这种新的处理程序和广泛用于微血管造影应用的程序基于B模式扫描（x空间）的空间频谱中高频分量的选择，这些高频分量来自移动物体的图像部分。然而，通过切换x空间和k空间之间的处理顺序，新的处理程序显示出有效抑制运动伪影引起的相位噪声的卓越功能。基于新的处理程序精确获取血管位置后，可以根据先前报道的方法更准确地校准投影血流速度。所展示的新程序对于临床微血管造影应用很有用，其中扫描探头中通常使用产生运动伪影的步进电机。
