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Objective To explore the application value of 3.0T MR diffusion tensor imaging (DTI)in 3D reconstruction of the knee peripheral nerve.Methods DTI with 25 motion probing gradients (MPGs)was performed on the left knee in 22 healthy young volunteers;By choosing the original images scaned in the vertical direction,three post-processing methods including maximum intensity proj ection (MIP),volume rendering (VR)and diffusion tensor tractography (DTT)were used.Two radiologists evaluated these images visually.For the same nerve,MIP,VR and DTT were compared using Friedman test.Intraclass correlation coefficient (ICC )analysis was used to compare the correlation among the three imaging methods.Score consistency between two observers was calculated by using the Kappa statistic.Results For the same nerve,there was no significant statistical difference for the MIP,VR and DTT imaging quality scores(P>0.05).The I CC value and the k value were 0.718-0.856,0.668-0.705,respectively.Conclusion Stereoscopic and clear displaying the tibial nerve/the common peroneal nerve in the knee can be achieved by using MIP,VR and DTT post-processing methods based on DTI original images.The reconstruction of MIP,VR is simple and efficient,in which the objectivity is better than DTT.The reconstruction of MIP,VR can be used as effective preview methods before the DTT reconstruction with complexity and strong subjective dependence.
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Objective To study the value of MRI sequence and MRA in the diagnosis of reversible cerebral vasoconstriction syn-drome (RCVS).Methods MRI and MRA of 5 patients with RCVS were reviewed retrospectively.Abnormal distribution,morpholo-gy,signal intensity of the affected arteries and complication of RCVS on MRI and MRA were analyzed.Results All patients showed multifocal segmental vasoconstriction and dilatation of cerebral arteries on MRA,which sometimes was described as “string and beads”.There were 4 patients with cerebral parenchyma lesions,in which posterior reversible encephalopathy syndrome was showed in one case,cortical subarachnoid hemorrhage in one case,and watershed infarcts in 3 cases.Five patients recovered after 3 months. Conclusion MRI and MRA can clearly show cerebrovascular morphology and observe parenchymal secondary lesions,which have an important guiding significance for clinical treatment and prognosis assessment.
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Objective To investigate the MSCT characteristics of peritoneal pseudomyxoma. Methods CT findings of peritoneal pseudomyxoma proved by surgery and pathology in 11 cases were retrospectively analyzed. Results On MSCT,the peritoneal pseud-omyxomas were irregular intraperitoneal cystic-solid masses, the CT attenuation was 18.5 ～ 27.6 HU, there were scallop-like, wavy and nodule-like indentations on the liver and/or spleen surface,large amount of mucinous ascites within abdominal, pelvic an-domentum cavity , thickening of peritoneum. On post-contrast administration , mild enhancement of peritoneum,cystic wall and omentum could be revealed. Conclusion MSCT examination has important value in diagnosis and differential diagnosis of peritoneal pseudomyxomas
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Objective To study the imaging findings of atypical thymoma.Methods 16 patients with atypical thymomas confirmed by pathology were involved in this study.Results In 16 cases,the all tumors appeared as soft tissue masses in anterior mediastinum,other imaging findings included lobulated sign in 12,calcification with in the tumors in 9,directly invasion to adjacent fatty tissue in 13 and mediastinum pleural and anterior chest wall in 7.The ipsilateral mediastinum pleural planting in 8,vascular involvement in 7 and pleural effusion in 6,pericardium effusion in 3 were showed.The tumors with smooth margins and clear surrounding fatty tissue were seen in 3,that were really simulating the benign thymoma.Conclusion Atypical thymoma are of certain imaging characteristics.
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Objective To evaluate the clinical application value of multislice spiral CT (MSCT) in diagnosis andclinical treatment of the chronic suppurative otitis media(CSOM). Methods Multislice spiral CT with direct axial plane and saggitalmultiplanar reformation(MPR) were performed in 61 cases including 76 ears.The results from those images were comparedwith that of operations. Results The sagittal MPR images preferably could delineate the anatomical details of the temporal bone and theadjacent relationship,and could display the tympanicand mastoid segment of the facial nerve,sigmoid sinus plate and the glomusjugular better.On the sagittal MPR images,the disruption of the ossicular chain and bony erosion in the tympanic cavity and antrum weredisplayed in 38 ears.The destruction of the facial nerve canal was severe in the type of cholesteatoma compared with the type of granuloma of chronic suppurative otitis media.The congenital abnormities were showed in 8 ears of the sigmoid sinus plate and 2 ears of the glomus jugular.Conclusion CT sagittal MPR images are of significant clinical value in showing the degree and location of destruction of the canal of facial nerve , and the relation between around structures in chronic suppurative otitis media.