Comparison of different motion estimation methods for vessel cross-sectional shear wave imaging

摘要

In most studies on vascular shear wave imaging (SWI), only longitudinal section is mainly concerned, and the radial motion and reflected waves are not considered in cross section. It is important to investigate the SWI in cross section when evaluating the anisotropy of the vessel wall or the complete plaque composition. In our previous study (He et al, UMB 2017), a novel method based on coordinate transformation and directional filtering was proposed to achieve the vessel cross-sectional shear wave imaging (VCS-SWI), where the radial motion was directly estimated in polar coordinates of the vessel. The radial motion can also be calculated from the axial and lateral motions estimated in the Cartesian coordinates of the transducer, or from multiple axial motions with spatial angular compounding. In this study, a comparison of the three methods for VCS-SWI was performed.