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目的：研究心肌梗塞演变过程中不同时期的ＭＲＩ影像特征及其病理基础。探讨ＭＲＩ在心肌梗塞方面的应用价值。材料与方法：２５只杂种犬结扎冠状动脉左前降支后，于心肌梗塞演变过程的不同时期行ＭＲＩ平扫、电影（Ｃｉｎｅ）磁共振成像和ＧｄＤＴＰＡ增强扫描。取心脏标本进行病理检查。结果：ＭＲＩ平扫不能区别梗塞心肌和非梗塞心肌。ＣｉｎｅＭＲＩ能真实反映梗塞心肌的部位、厚度及运动功能状态。心肌梗塞演变的不同时期，由于其病理基础不同，产生不同的ＧｄＤＴＰＡ增强表现。结论：ＣｉｎｅＭＲＩ及ＧｄＤＴＰＡ增强ＭＲＩ是敏感而又可靠地能显示各期心肌梗塞。
Objective: To study the MRI features and pathology of different stages of myocardial infarction. To explore the value of MRI in myocardial infarction. MATERIALS AND METHODS: Twenty-five crossbred dogs were ligated with left anterior descending coronary artery and scanned by MRI, Cine MRI and Gd-DTPA in different stages of myocardial infarction. Take the heart specimens for pathological examination. Results: MRI plain scan can not differentiate between infarcted myocardium and non-infarcted myocardium. Cine MRI can truly reflect the location of myocardial infarction, thickness and motor function status. Myocardial infarction at different stages of evolution, due to its different pathological basis, have different Gd DTPA enhanced performance. Conclusion: CineMRI and GdDTPA enhanced MRI is sensitive and reliable to show various stages of myocardial infarction.