论文部分内容阅读
目的探讨脑梗死后出现T1WI高信号时的磁共振弥散加权成像(DWI)表现。方法选择自2015年5月至2016年6月的脑梗死行头部MRI检查的患者40例,内有T1WI高信号出现,均在完成MRI检查后1d开展CT检查,且15d内行MRI复查。通过自旋回波-单次激发e PI序列行DWI扫描。结果在原脑梗死内,检出T1WI高信号部位,有脑回状、斑片状、线状含铁血黄素沉积的T2WI低信号25例;CT示,脑沟回状更高密度影4例,基底节区以斑片状更高密度影显示2例。随访DWI(b=0)序列,同部位为稍高信号3例,低信号1例,等信号1例。相较T2WI序列,DWI对低信号显示的范围呈更大显示,且边缘更为清晰。结论针对临床病发脑梗死的患者,仅部分T1WI高信号为梗死后出现,相较CT,MR对梗死后出血显示更为敏感,与DWI(b=0)图像结合,基本可对梗死后出血做出科学、正确诊断。
Objective To investigate the performance of diffusion weighted imaging (DWI) in the presence of T1WI high signal after cerebral infarction. Methods From May 2015 to June 2016, 40 patients with cerebral infarction who underwent head MRI were examined with high T1WI signals. CT examination was performed on the first day after MRI examination and MRI was performed on the 15th day. DWI scans were performed by spin echo-single shot e PI sequences. Results In the original cerebral infarction, T1WI high signal area was detected, and there were 25 cases of T2WI low signal of cerebral gyrus, patchy and linear hemosiderin deposition. CT showed a higher density of cerebral cortical gyrus in 4 cases, Basal ganglia in patchy higher density shows 2 cases. Follow-up DWI (b = 0) sequence, the same site for the slightly higher signal in 3 cases, 1 case of low signal, and other signals in 1 case. Compared with the T2WI sequence, DWI showed a wider range of low signal display and the edge was clearer. Conclusions For patients with clinically ill cerebral infarction, only some of T1WI high signal appears after infarction. Compared with CT, MR is more sensitive to post-infarction hemorrhage. Combined with DWI (b = 0) images, MR can basically hemorrhage after infarction Make a scientific, correct diagnosis.