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1.
Chinese Journal of Radiology ; (12): 505-510, 2017.
Article in Chinese | WPRIM | ID: wpr-610959

ABSTRACT

Objective To prospectively determine the feasibility of high-resolution in vivo MR imaging in the evaluation of esophageal carcinoma invasion at 3.0 T.Methods One hundred and eighteen patients with esophageal carcinoma,proven by the gastroscopic biopsy,were prospectively studied using 3.0 T MR.The esophageal specimens were sectioned transversely to keep consistent in the orientation with the MR images,the histopathological stage was made and the thickness of the tumor on the largest diameter of the slice were measured.The MR images were reviewed in the transverse plane.According to the seventh American joint committee on cancer,the MR stage was made and the tumor's thickness was measured.The MR images and the histopathological slices were matched.The staging diagnostic efficacy of the MR imaging was evaluated with the histopathological results as the standard reference,Kappa test was used to compare the stage of MR imaging with that at the histopathological analysis.Bland-Altman scatterplots were used to compare the thickness of tumor measured on the MR images with that at the histopathological measurement.Results Ninety seven cases(82.2%,97/118) of MR stage were accurately made,including 7 T1a,15 T1b,18 T2,25 T3 and 32 T4a cases,furthermore,14 cases were over staged and 7 cased were underestimated.The MR stage was highly consistent with the histopathological stage (Kappa=0.772).The sensitivity for the staging of high-resolution MR imaging at 3.0 T was 58.3%(7/12) to 100.0%(32/32),the specificity was 95.3% (82/86) to 98.1% (104/106),and the accuracy was 91.5% (108/118) to 96.6% (114/118),respectively.Bland-Altman scatterplots demonstrated that the discrepancy of the mean thickness between the value obtained by three radiologists respectively and the histopathological analysis were 2.0,2.6 and 2.1 mm,which demonstrated a good consistency.Conclusion High-resolution MR images obtained at 3.0 T can be used to evaluate the depth of carcinoma invasion and provide excellent diagnostic accuracy for preoperative staging.

2.
Journal of Practical Radiology ; (12): 1066-1069,1084, 2016.
Article in Chinese | WPRIM | ID: wpr-604567

ABSTRACT

Objective To explore the imaging characteristics of testicular germ cell tumors and to improve the MRI diagnostic level. Methods MRI and clinical data of 25 cases confirmed testicular germ cell tumor by pathological examination were retrospectively analyzed. All the 25 cases were performed plain scan of MRI,and 16 patients underwent MRI enhanced scan.The size,morphology,signal intensity, adjacent structures,enhancement figure and tumor supplying artery were assessed and the histopathological findings were servered as the standard of reference.Results In the all 25 testicular germ cell tumors,10 cases were seminoma,8 cases showed homogeneous low signal intensity,2 cases of seminoma were low signal intensity on T2 WI,furthermore 5 cases performed poor nodular enhance-ment,2 cases performed homogeneous enhancement,4 cases performed fibrous septa enhancement.4 cases were yolk sac tumor ap-peared equal-low signal on T1 WI,slightly high signal intensity on T2 WI and progressive enhancement.Mature teratoma,pidermoid cyst and mixed germ cell tumor were 3 cases respectively,the MRI demonstrated mixed low signal intensity on T1 WI and mixed high signal on T2 WI.2 cases were embryonal carcinoma demonstrated middle-low signal intensity on T1 WI,and mixed low signal intensity on T2 WI.The two cases revealed bleeding signal intensity and septa enhancement.Conclusion MRI can be used to diagnose germ cell tumors with high accuracy,and provides essential information for pathological type,stage and differential diagnosis.

3.
Chinese Medical Journal ; (24): 3082-3087, 2014.
Article in English | WPRIM | ID: wpr-240225

ABSTRACT

<p><b>BACKGROUND</b>The diagnosis of liver fibrosis is a difficult task at any time using conventional clinical imaging. Intravoxel incoherent motion (IVIM) can be used to investigate both diffusion and perfusion changes in tissues. This study was designed to determine the value of IVIM in the diagnosis and staging of liver fibrosis.</p><p><b>METHODS</b>IVIM examinations were performed on a GE 3.0T MR scanner in 25 patients with liver fibrosis and 25 healthy volunteers as the control group. Patients with liver fibrosis diagnosis were confirmed by pathology and staged on a scale of F0-4. The standard ADC values and the values of a biexponential model (slow ADC (Dslow), fast ADC (Dfast) and fraction of fast ADC (FF)) were measured in three liver regions per person. The mean standard ADC values, Dslow values, Dfast values and FF values from the study group were compared among the right posterior hepatic lobe, right anterior hepatic lobe and medial segment of the left lobe. Receiver Operating Characteristic (ROC) curves and independent-samples t-tests were used to calculate the mean standard ADC values, Dslow values, Dfast values and FF values from the study group and the control group. Spearman rho correlation analysis was used for the stage of liver fibrosis. The liver fibrosis stages between the groups F0-1 and F2-4, the groups F0-2 and F3-4 were compared.</p><p><b>RESULTS</b>Among the liver fibrosis, there was no significant difference in the mean standard ADC values, Dslow values, Dfast values, and FF values obtained from the right posterior hepatic lobe, right anterior hepatic lobe and medial segment of the left lobe. Using ROC analysis, the Area Under the Curve (AUC) values of standard ADC, Dslow, Dfast, FF were all between 0.7 to 0.9. The mean standard ADC values, Dslow values, Dfast values and FF values of the liver in the study group were significantly lower than the values in the control group (P < 0.05). As the stage of the fibrosis increased, the values decreased by Spearman rho correlation analysis. The mean values (standard ADC, Dslow, Dfast, and FF) of liver fibrosis stages between the groups F0-1 and F2-4, the groups F0-2 and F3-4 showed significant differences (P < 0.05).</p><p><b>CONCLUSIONS</b>IVIM can reflect the conditions of perfusion and diffusion in liver fibrosis and thus distinguish between normal liver and liver fibrosis. The IVIM technique may serve as a valuable tool for detecting and characterizing liver fibrosis, and monitoring its progression in a noninvasive manner.</p>


Subject(s)
Adult , Aged , Diffusion Magnetic Resonance Imaging , Methods , Female , Humans , Liver , Pathology , Liver Cirrhosis , Diagnosis , Male , Middle Aged
4.
Article in Chinese | WPRIM | ID: wpr-544307

ABSTRACT

Objective To study the role of esophageal dynamic double contrast radiography(DDCR) in diagnosing early esophageal carcinoma(EEC).Methods The patients with clinical suspected EEC underwent conventional double contrast radiography(CDCR) and DDCR using digital fluoroscopic imaging unit.The radiographic materials including CDCR and DDCR in 40 cases of EEC proved by endoscopy or pathologic histology were analyzed by a blind study,and the reliability of CDCR and DDCR was evaluated.Results The major findings of EEC included the mucosal irregularity and tortuous,small niches and filling defect,the soft and expansive extent of esophageal wall reduced or disappeared.In showing the esophageal function,DDCR was significantly superior to CDCR(?~2=4.50,?

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