Objective: To evaluate the feasibility of identifying viable myocardium by applying low dose dobutamine echocardiography (LDDSE) combined with Doppler tissue imaging (DTI).

目的：探讨低剂量多巴酚丁胺负荷超声心动图(LDDSE)结合多普勒组织成像技术(dti)评价存活心肌的可行性。

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Objective: To establish porcine chronic ischemic myocardium model and to evaluate ultrasonic integrated backscatter(IBS) and Doppler tissue imaging(DTI) in detecting this model.

目的：建立心肌慢性缺血动物模型，探讨超声背向散射积分（IBS）和多普勒组织成像（DTI）技术检测慢性心肌缺血的价值。

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Objective to quantitatively define the ischemic myocardium response to dobutamine stress echocardiography (DSE) in coronary artery disease (CAD) patients by Doppler tissue imaging (DTI).

目的探讨多普勒组织成像技术(dti)定量分析多巴酚丁胺超声负荷试验(dse)过程中缺血心肌室壁运动的特征。

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