The Applied Value Of MR Susceptibility Weighted Imaging In The Diagnosis Of Hemorrhagic Cerebral Infarction

Objective:To explore the clinical application value of susceptibility weighted imaging(SWI) in hemorrhagic cerebral infarction.Methods:Between September 2009 and February 2011,430 patients suspected cerebral infarction in our hospital were enrolled. All patients were performed at 3.0T MRI scanner (Achieva; Philips Medical Systems, the Netherlands) in axial planes of conventional sequences (T1WI and T2WI), DWI and SWI. All MRI images were reviewed in a blinded fashion independently by two experienced neuroradiologists respectively. Results of each patient reach an agreement by the two neuroradiologists. The MR conventional images (T1WI and T2WI), DWI and SWI images from each subject were evaluated at separate sessions in a random order. The number and the presence or absence of hemorrhagic lesions were analyzed on T1WI,T2WI,DWI and SWI images. The area of hemorrhagic lesions in maximum slice was measured simultaneously. A paired chi-square test was used to determine whether the differences in the number of hemorrhagic lesions detected by T1WI,T2WI,DWI and SWI were statistically significant. A paired t test was used to analyze the statistical significance of differences in the area of hemorrhagic lesions on maximum slices using T1WI,T2WI,DWI and SWI images. The data was analyzed by SPSS 17.0, P value less than 0.05 was accepted as statistically significant.Results:Of all patients, hemorrhagic cerebral infarction were diagnosed in 45 cases by SWI sequence,20 cases by T1WI,28 cases by T2WI and 31 cases by DWI. There were 62,30,45 and 48 hemorrhagic lesions were showed on SWI, T1WI, T2WI and DWI sequence. All hemorrhagic lesions on SWI were larger than that on T2WI,T1WI and DWI sequence.Conclusion:Compared with MR conventional imaging (T1WI and T2WI) and DWI imaging, SWI can be able to detect more and larger area of hemorrhagic lesions in earlier stage. SWI is superior to MR conventional imaging (T1WI and T?WI) and DWI imaging in the diagnosing hemorrhagic cerebral infarction, and then can be used as the first line, routine and follow-up examination for patients with acute cerebral infarction.