Azimuthal registration of image sequences affected by nonuniform rotation distortion
Azimuthal registration of image sequences affected by nonuniform rotation distortion
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DOI：
10.1109/titb.2007.908000
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发表时间：
2008-05-01
影响因子：
--
通讯作者：
van der Steen, Antonius F. W.
中科院分区：
文献类型：
--
作者：
van Soest, Gijs;Bosch, Johan G.;van der Steen, Antonius F. W.
使用机械旋转内窥镜探头扫描管状体积（如动脉）的成像方式，由于不均匀旋转失真（NURD），通常会导致图像退化。在本文中，我们提出了一种新的方法来对齐图像序列中的单个线。它是基于动态时间翘曲，找到一个连续的路径，通过一个代价矩阵，测量两个帧对齐的区域之间的相似性。路径表示NURD对应的角度失配。与早期的工作相比，这种新方法的主要优点是线对线的连续性，它可以准确地捕获探针旋转速度的缓慢帧内变化。该算法使用临床可用的血管内光学相干断层扫描（OCT）仪器在真实的血管幻影中进行数据优化。在体内记录中证明了其有效性，并与传统的全局旋转块匹配进行了比较。血管内OCT是一种特别具有挑战性的运动校正方式，因为在临床情况下，图像通常是欠采样的，并且不同线或帧中的斑点之间缺乏相关性。该算法可以适应逐帧摄取数据，并且可以实现实时工作。
Imaging modalities that use a mechanically rotated endoscopic probe to scan a tubular volume, such as an artery, often suffer from image degradation due to nonuniform rotation distortion (NURD). In this paper, we present a new method to align individual lines in a sequence of images. It is based on dynamic time warping, finding a continuous path through a cost matrix that measures the similarity between regions of two frames being aligned. The path represents the angular mismatch corresponding to the NURD. The prime advantage of this novel approach compared to earlier work is the line-to-line continuity, which accurately captures slow intraframe variations in rotational velocity of the probe. The algorithm is optimized using data from a clinically available intravascular optical coherence tomography (OCT) instrument in a realistic vessel phantom. Its efficacy is demonstrated on an in vivo recording, and compared with conventional global rotation block matching. Intravascular OCT is a particularly challenging modality for motion correction because, in clinical situations, the image is generally undersampled, and correlation between the speckle in different lines or frames is absent. The algorithm can be adapted to ingest data frame-by-frame, and can be implemented to work in real time.