超声心动图散斑跟踪是基于医学超声成像技术，通过跟踪心肌组织内部大量的散射粒子形成的散斑或散斑模式,确立了菱形搜索、SAD匹配准则-Echocardiographic speckle tracking is based on the medical ultrasonic imaging technology, by tracking the myocardial tissue within a large amount of scattering particles speckle or spec