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Objective To investigate the clinical application of SWI in detecting calcifications of vertebral artery wall.Methods 1 95 patients who accepted craniocerebral CT scans,and MRI scans (includingT1 WI,T2 WI,T2 GFLAIR,SWI)in recent three years in the Affiliated Hospital of Binzhou Medical University were reviewed.Taking CT as a standard,the calcification of intracranial vertebral artery wall was analyzed using conventional MRI and SWI sequences,and their sensitivities and specificities were calculated.Correlations among various imaging modalities were assessed by measuring the maximum diameter of calcifications.Results The sensitivity of SWI was 93%, and the specificity of SWI was 9 9%.The sensitivity of conventional MRI was 3 1%,and the specificity of conventional MRI was 9 1%. The correlation between SWI and CT was R2＝0.77 (0.60－0.89),while the correlation between conventional MRI and CT was R2＝0.22 (0.02－0.80).Conclusion SWI has high sensitivity and specificity in detecting calcification of intracranial vertebral artery wall,and has a good correlation with CT in measuring calcification,which can be a inspection method to detect calcification of intracranial vertebral artery wall.
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Objective To evaluate the changes of diffusion kurtosis imaging (DKI) parameters with time in cerebral in farction patients,and contrast with diffusion tensor imaging (DWI).Methods DWI and DKI scans were performed in 95 patients of cerebral infarction.The patients were divided into five groups according to the time of cerebral infarction:Hyperacute phase (n=10),acute phase (n=12),early subacute phase (n =33),late subacute phase (n =20) and chronic phase (n =20).Parameters of DKI were obtained,and the parameters and percentage change of diffusion metrics from normal to ischemic tissue were compared.The evolution rule of parameter with time was analyzed.Results Mean kurtosis (MK),axial kurtosis (K//),radial kurtosis (K⊥) of DKI parameters increased after infarction,and reached the peak at acute phase,and decreased gradually with the prolonging of time.Mean diffusion (MD),axial diffusion (D//),radial diffusion (D⊥) of DTI parameters decreased after infarction,and reached the lowest at the acute phase,and increased gradually with the prolonging of time.The percentage change of MK,K//,K⊥ were higher than those of MD,D//,D⊥,and percent change along the axial direction were significantly larger than that along the radial direction.Conclusion DKI is superior to DTI in evaluating cerebral infarction,and can analyze the changes of microstructure of cerebral infarction comprehensively.
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Objective To explore the imaging features of appendiceal mucinous neoplasms and their correlation with the pathology results.Methods The imaging data of 1 6 patients with histopathology proved appendiceal mucinous neoplasms were analyzed retrospectively including mucinous adenoma in 2,low-grade appendiceal mucinous neoplasm (LAMN)in 10,and appendiceal adenocarcinoma in 4. The imaging features were correlated with the result of pathology.Results Mucinous cystadenoma was usually a long oval or strip low density cystic structures with smooth capsule wall and well defined border.Mucinous adenocarcinoma usually presented as a irregular solid-cystic mass with ill-defined border and nodular or separation enhancement.The tumor often infiltrated adjacent bowels,and some of them were accompanied with pseudomyxoma peritonei (PMP)and abdominal implantation metastasi.LAMN had low potential malignancy.The imaging features were between cystadenoma and cystadenocarcinoma.Most cases were similar to mucinous cystadenoma, and some were like to mucinous cystadenocarcinoma.Conclusion The appendiceal mucinous neoplasms have various imaging manifestations. Some cases show some CT and MRI characteristics,which are benefit to the diagnosis of these diseases.
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Objective To evaluate the clinical value of susceptibility weighted imaging (SWI)in full-term neonatal hypoxic ische-mic encephalopathy (HIE).Methods Sixty-three neonates with HIE were collected and scanned by Siemens 3.0T superconducting MR scanner.Routine axial conventional MRI scan and axial SWI scan were conducted.Results In 63 neonates,a total of 29 cases with different degree of intracranial hemorrhage were scanned with SWI sequence.A total of 1 5 1 intracranial hemorrhages were found.Conventional MRI sequences were performed in 1 5 cases with different degree of intracranial hemorrhage.Only 78,43 and 88 hemorrhages were found by T1 WI,T2 WI and T2 Flair sequences,respectively.SWI were significantly superior to conventional MRI sequences in displaying the scope and boundary definition of hemorrhage.Conclusion SWI sequence is obviously better than the con-ventional MRI sequences in bleeding detection and displaying hemorrhage stove,and it provides a powerful imaging method for the clinical diagnosis and treatment.