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