A generalized speckle tracking algorithm for ultrasonic strain imaging using dynamic programming.
A generalized speckle tracking algorithm for ultrasonic strain imaging using dynamic programming.
复制标题
使用动态编程的超声应变成像的广义散斑跟踪算法。
DOI：
10.1016/j.ultrasmedbio.2009.05.016
复制
发表时间：
2009-11
影响因子：
2.9
通讯作者：
Hall, Timothy J.
中科院分区：
文献类型：
--
作者：
Jiang, Jingfeng;Hall, Timothy J.
关键词：
本文提出了一种改进的超声应变成像运动估计算法，该算法采用动态规划技术。在本文中，我们将运动估计任务建模为一个优化问题。由于外部机械刺激下的组织运动往往需要合理连续，因此采用一组结合相关性和各级运动连续性约束的代价函数对运动估计进行正则化。为了在合理的计算量下解决优化问题，采用不需要迭代的动态规划技术获得整数精度的位移向量。然后，采用子样本估计算法计算分数精度下的局部位移。用体内超声回波数据集研究了两种实现方案。我们发现，对于体内临床数据，所提出的算法比之前的算法提供了更准确的位移估计。特别是，新算法能够在更复杂的解剖结构中跟踪运动，并在一系列图像中增加应变图像的一致性。初步结果还表明，与之前的算法相比，新算法可以获得更长的高对比度应变图像序列。新算法还可以容忍较大的运动不连续（例如，拟人化子宫幻影中的腔）。
This study developed an improved motion estimation algorithm for ultrasonic strain imaging that employs a dynamic programming technique. In this paper, we model the motion estimation task as an optimization problem. Since tissue motion under external mechanical stimuli often should be reasonably continuous, a set of cost functions combining correlation and various levels of motion continuity constraint were used to regularize the motion estimation. To solve the optimization problem with a reasonable computational load, a dynamic programming technique that does not require iterations was used to obtain displacement vectors in integer precision. Then, a sub-sample estimation algorithm was used to calculate local displacements in fractional precision. Two implementation schemes were investigated with in vivo ultrasound echo data sets. We found that the proposed algorithm provides more accurate displacement estimates than our previous algorithm for in vivo clinical data. In particular, the new algorithm is capable of tracking motion in more complex anatomy and increases strain image consistency in a sequence of images. Preliminary results also suggest that a significantly longer sequence of high contrast strain images could be obtained with the new algorithm compared to the previous algorithm. The new algorithm can also tolerate larger motion discontinuities (e.g. cavity in an anthropomorphic uterine phantom).
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DOI：
10.1109/58.285465
发表时间：
1994-05-01
影响因子：
3.6
作者：
ODONNELL, M;SKOVORODA, AR;EMELIANOV, SY
通讯作者：
EMELIANOV, SY
影响因子：
3.5
作者：
Pesavento, A;Lorenz, A;Ermert, H
通讯作者：
Ermert, H
影响因子：
10.6
作者：
Pellot-Barakat, C;Frouin, F;Herment, A
通讯作者：
Herment, A
影响因子：
19.7
作者：
Burnside, Elizabeth S.;Hall, Timothy J.;Hangiandreou, Nicholas J.
通讯作者：
Hangiandreou, Nicholas J.
影响因子：
3.5
作者：
Jiang, J.;Hall, T. J.
通讯作者：
Hall, T. J.