RESUMO
Objective To investigate the diagnostic value of diffusion-weighted imaging (DWI) in ovarian cystic or solid lesions with different b values.Methods 95 patients,total 105 lesions,including 61 benign lesions (53 cystic,19 solid) and 33 malignant lesions (10cystic,23 solid) with ovarian cystic or solid lesions underwent traditional MRI and DWI.The scan sequence of DWI was SE-EPI,with the b values of 0,500,1 000 s/mm2.The contrast to noise ratio (CNR) was calculated to evaluate the image quality.The apparent diffusion coefficient (ADC) value and exponent apparent diffusion coefficient (eADC) value of ovarian masses were measured.Results With the increase of b values,the signal and CNR of ovarian masses was decreased,and the intensity of cystic component was sharper than that of solid component.There was no signifi cant difference of the ADC values and eADC values between the benign and malignant ovarian cystic masses (P＞0.05).But the results had significant difference between the benign and malignant ovarian solid masses (P＜0.05).Conclusion Quantitative analysis of ADC and analysis the characteristic of CNR will help the differential diagnosis of some benign and malignant ovarian diseases.
RESUMO
Objective To analyze the CT characteristics of chronic schistosomiasis liver disease,in order to improve the accuracy of CT diagnosis for the disease.Methods We analyzed the CT features of 125 cases of clinical pathology diagnosis of chronic schistosomiasis liver and of 50 normal control group,and measured the hepatic lobe lines and spleen index.Results (1) Schistosoma calcification:In 125 cases,there were 120 patients with varying degrees of liver calcification,in which 76 cases of intrahepatic or subcapsularlinear calcification,44 cases of reticular or map-like calcification,33 cases of calcification portal system,15 cases of spleen calcification,85 cases of intestinal wall calcification;(2) Morphological changes of the liver and spleen:The transverse diameter of the left hepatic lobe,caudate lobe,and caudate lobe-right lobe ratio were larger in patients with chronic schistosomiasis than controls,the transverse diameter of the right hepatic lobe were smaller and there were statistically difference (P＜0.001).There were 82 cases of expanded gallbladder fossa in chronic schistosomiasis.Splenic index in patients with chronic schistosomiasis and had no obvious difference in the control group (P＞0.05);(3) Schistosomiasis liver's complications:there were 43 cases of cholecystitis and cholelithiasis,11 cases of liver cancer,5 cases of colon cancer,3 cases of bladder cancer.Conclusion Intrahepatic calcification and the left hepatic lobe and caudate lobe enlargement are CT signs of chronic schistosomiasis,which is often merged with many complications.
