Background and objectivesStrain rate imaging (SRI) or strain imaging (SI) is a new assessment of regional myocardial wall deformation based on Doppler tissue velocity imaging (TVI).

• 应变率成像(SRI)与应变成像(SI)是在多普勒组织速度成像(TVI)基础上发展起来的以心肌形变为研究对象的超声新技术。