不同磁共振成像序列在颈髓损伤中的应用比较

目的 比较常规MRI序列、梯度回波T2*加权成像(T2*WI)及磁敏感加权成像(susceptibility weighted imaging,SWI)在急性颈髓损伤(SCI)中的应用价值.方法 对16例有急性颈椎外伤病史的患者,均采用3T MRI (TrioTim,Siemens Medical Solution)行...

Comparison of different MRI sequences in cervical spinal cord injury

Objective：To compare conventional MRI,gradient-echo（GRE） T2-weighted imaging（WI） and susceptibility weighted imaging（SWI） in acute cervical spinal cord injury（SCI）.Materials and Methods：Conventional T1WI,T2WI,GRE T2WI and high-resolution SWI were performed on sixteen patients with a history of acute cervical spine traumaby using a 3 Tesla MRI system（TrioTim,Siemens Medical Solution）.The MRI findings on each sequence was observed and classified into 4 types：normal cord,spinal cord edema,spinal cord contusion and spinal cord hemorrhage.The signal intensity in the hemorrhage and normal spinal cord were measured on the same slice of T2WI and SWI,respectively,and the ratio of the hemorrhage to normal spinal cord were calculated and compared by using Wilcoxon signed ranks test.All patients were also evaluated with clinical follow-up.Twenty volunteers were scanned as a control group.Results：In 16 patients with acute cervical spine trauma,conventional T1WI and T2WI showed normal in 2 cases and SCI in 14 patients,in which 6 patients had spinal cord edema,4 had contusion and 4 had hemorrhage.However,both SWI and T2WI demonstrated normal in 10 cases and detected hemorrhage in 6 patients,in which only 4 patients were detected hemorrhage by conventional MRIs,the other 2 patients were showed spinal contusion on conventional MRIs.The mean signal ratio of hemorrhage to normal tissue was 0.58 on T2WI and 0.47 on SWI,and a significant difference was revealed between them（Z=2.33,P=0.02）.Conclusion：Conventional MRI including T1WI and T2WI is valuable in demonstrating spinal edema and contusion,but not very sensitive to spinal hemorrhage.SWI is more sensitive than T2WI in detecting hemorrhage in acute cervical SCI and could be included in the routine evaluation of cervical SCI patients.