中文摘要：

【目的】分析特发性扩张型心肌病（IDc）在MRI心肌延迟成像（LGE）的影像特征。【方法】41例临床诊断为IDC的患者接受双倍剂量钆造影剂MRI心肌延迟增强扫描，按照17心肌分段评价LGE的分布，按照心内膜下、心肌中层、心外膜和透壁评价LGE的范围。[结果]41例患者中，22例共计205个节段出现对延迟比强化，其分布特征为左室基底部92个节段（44．9％）、左室中部68个节段（33．2％）、心尖水平26个节段（12．7％）；室间隔86节段（42．0％）、前壁34个节段（16．6％）、外侧壁30个节段（14．6％）、外下壁30个节段（14．6％）；强化范围特征为透壁强化46个节段（22．4％）、心肌中层141个节段（68．8％）、心外膜9个节段（4．4％）、心内膜9个节段（4．4％）。[结论]IDC心肌纤维化对应的LGE分布有一定的特征性，以心底和心室中部受累常见，表现为心肌中层或者透壁强化为主，可以作为IDC诊断的一个主要指标。

英文摘要：

[Objective] To analyze the image characteristics of myocardial late gadolinium enhancement （LGE） on MRI of idiopathic dilated cardiomyopathy（IDC）. [Methods] Forty-one patients clinically diagnosed as IDC received MRI myocardial delay contrast scans after administration of double-dose of Gd-chelate contrast agent. LGE distribution was evaluated by 17-myocardial segmentation. The extent of LGE was evaluated by sub-endocardium, middle myocardium, epicardium and transmural myocardium. [ResultslAmong 41 patients, a total of 205 segments of 22 patients showed LGE, and the distribution characteristics were 92 segments at basilar ＇part of left ventricle（44.9%）, 68 segments at middle of left ventricle（33.2% ）, 26 segments at cardiac apex level（12.7%）, 86 segments of interventricular septum（41.0%）, 34 segments of anterior wall（16.6%）, 30 segments of lateral wall（14. 6%） and 30 segments of inferior wall（14. 6%）. The enhancement features were 46 segments of transmural myocardium（22.4%）, 141 segments of middle myocardium（68.8%）, 9 seg- ments of epicardium（4.4%） and 9 segments of endocardium（4.4%）. [Conclusion]The distribution of LGE of IDC myocardial fibrosis has certain characteristics. Cardiac base and middle ventricle involvement are common- ly seen. The main manifestations are th.e enhancement of middle or transmural myocardium, which can be used as the major indicator of the diagnosis of IDC.