Accurate ultrasonic measurement of two‐dimensional displacement of heart wall motion for estimation of myocardial regional strain rate
Accurate ultrasonic measurement of two‐dimensional displacement of heart wall motion for estimation of myocardial regional strain rate
复制标题
精确超声测量心壁运动二维位移估计心肌局部应变率
DOI：
10.1121/1.2935445
复制
发表时间：
2008
影响因子：
2.4
通讯作者：
H. Kanai
中科院分区：
文献类型：
--
作者：
Y. Honjo;H. Hasegawa;H. Kanai
心脏壁应变率成像方法可用于定量评价局部心功能。我们开发了一种方法，它可以准确地测量心壁运动沿着超声束的基础上的相位变化的射频回波。然而，在室壁运动中有一些分量并不沿着每个超声束。因此，除了在轴向方向上的运动的测量之外，还需要在垂直于梁的方向上（横向）的运动的测量，但是在壁的横向运动的估计中仍然存在一些未解决的问题。在本研究中，通过射频回波之间的2D互相关估计二维位移。重要参数，即确定跟踪精度的感兴趣区域和搜索区域的大小，通过参考相应心脏相位中的瞬时壁速度进行自适应优化。通过纵轴视图中优化参数的2D跟踪估计的侧向位移与通过1D基于相位的方法分别准确估计的心尖视图中的轴向位移（对应于纵轴视图中的侧向位移）之间的相关系数为0.93。这些结果表明，该方法可以准确测量二维心脏运动，以评估局部心肌应变率。
Methods for imaging of strain rate in the heart wall are useful for quantitative evaluation of regional heart function. We developed a method which can accurately measure the heart wall motion along an ultrasonic beam based on phase changes in rf echoes. However, there are some components in the wall motion which are not along each ultrasonic beam. Therefore, the measurement of motion in the direction perpendicular (lateral) to the beam has been required in addition to that in the axial direction, but some unsolved problems remain in estimation of lateral motion of the wall. In this study, two‐dimensional displacement was estimated by 2D cross‐correlation between rf echoes. Important parameters, the sizes of a region‐of‐interest and search region, which determine tracking accuracy, were adaptively optimized by referring to instantaneous wall velocities, in the respective cardiac phases. The correlation coefficient between the lateral displacement estimated by the 2D tracking with optimized parameters in longitudinal‐axis view and axial displacement in apical view (corresponding to lateral displacement in longitudinal‐axis view) separately and accurately estimated by the 1D phase‐based method was 0.93. These results show possibility of this method for accurate measurement of two‐dimensional heart motion to assess the regional myocardial strain rate.
影响因子：
4.2
作者：
Bohs, LN;Geiman, BJ;Trahey, GE
通讯作者：
Trahey, GE
影响因子：
2.3
作者：
CESPEDES, I;HUANG, Y;SPRATT, S
通讯作者：
SPRATT, S