Study limitations
The present study still existed some limitations. First of all, 3D-STE uses low frame rate to collect real-time three-dimensional full volume images for analysis, which will cause the loss of myocardial motion information and low image resolution. In addition, the image quality is very high. It needs to show the endocardium clearly and then trace it. If necessary, it needs to be manually adjusted, which exists great subjectivity. Furthermore, 3D-STE is not suitable for image acquisition of patients with irregular heart rhythm, and the scanning angle of 3D-STE is narrow, so it is difficult to obtain complete image information for patients with large heart. Finally, we had a relatively small study population, so it is necessary to expand the sample size for further study in the future.