目的归纳不同期相脑血肿成分 及其演变规律，总结其MRI信号特点，探 讨脑出血MRI检查方法的优势。方法 记录 临床资料完全的48例脑出血患者的MRI影 像信息。将血肿详细分期，分析MRI常规 及功能检查时，不同期相脑出血的血肿成 分、信号特点及周围水肿带的演变规律。 结果 超急性期14例，T1WI低信号，T2WI 以高信号为主，Flair信号改变与T2WI相 近，DWI信号外高内地，SWI极低信号。急 性期12例，T1WI信号翻转，T2WI以低信 号常见，Flair信号改变与T1WI相近，DWI 与急性期相似，SWI低信号(晚期出现低、 等为主的混杂信号)。亚急性期10例，脑 血肿成分最为复杂，T1WI可见“高信号厚 环包绕低信号区”的特征，T2WI信号混 杂，Flair常见高及稍高信号，DWI及SWI 信号混杂。慢性期8例，此期MRI征象最具 特点，几乎所有序列呈“中央高信号和边 缘区低信号环”。残腔期4例，1年内各序 列显示不规则低信号环包绕条索样高信号 区，而1年后均呈低信号。结论 血肿时相 及内容成分的演变是一个连续过程，也 是MRI成像的物质基础，不同期相脑出血 均有MRI影像特点；而周围水肿带也有发 生、蔓延、加重、缓解及最后消散的过 程。

Objective Induces the composition and evolution of phase hematoma at different times, summarizes its MRI signal characteristics, and discusses the advantages of MRI examination for cerebral hemorrhage. Methods The MRI imaging information of 48 patients with cerebral hemorrhage with complete clinical data was recorded. The hematoma was staged in detail and the hematoma composition, signal characteristics, and the evolution of the surrounding hydrosphere were analyzed during the routine and functional examination of MRI. Results Hyper acute hemorrhage (14 cases), T1WI low signal,T2WI is a high signal, The Flair signal changes to T2WI, The DWI signal is outside the mainland, SWI is extremely low signal. Acute cerebral hemorrhage (12 cases), T1WI signal to flip, T2WI is common with low signals, Flair signal changes similar to T1WI, DWI is similar to the acute phase,SWI is Low signal (low, mostly mixed signals). Sub acute cerebral hemorrhage (10 cases), Brain hematoma composition is the most complex, T1WI visible "thick ring surrounding the high signal low signal area", the characteristics of the mixed T2WI signal, common high Flair and slightly high signal,DWI and SWI signals are confounding. Chronic cerebral hemorrhage (8 cases), This phase of MRI is the most characteristic, and almost all sequences are "Central High signal and low signal ring in the edge area". Residual cavity bleeding (4 cases), within 1 year of each sequence shows irregular low signals article ring surrounding the cable sample is high,and are in low signal the 1 years later. Conclusion The hematoma evolution of the phase and the content composition is a continuous process, also is the material basis of MRI imaging, not in the same period in cerebral hemorrhage has the MRI imaging features; And surrounding edema belt have happened, spread, increase process, ease and finally dissipated.