Objective To study the characteristic differences using CTs and MRIs between intracranial hemangiopericytomas (HPCs)and meningiomas of different pathological type.Methods 8 cases of HPC and 5 1 cases of meningioma approved by patholo-gy were selected.All cases underwent MRIs,CTs and enhancements before operation.The imaging characteristics of these tumors were analyzed with chi-square test.Results Compared with atypical meningioma,tumor bleeding(χ2 = 1 1.484),blood vessel flow void phenomenon(χ2 =8.571),skull damage(χ2 =5.529)showed remarkably significant statistical differences(P <0.05);compared with malignant meningioma,tumor bleeding(χ2 =1 1.484),blood vessel flow void phenomenon(χ2 = 1 1.429)showed remarkably significant statistical differences(P <0.05).Conclusion There are differences between HPC and meningiomas of different pathologi-cal type.It is helpful to improve the diagnosis level through comparative analysis of the MRI and CT findings.

Objective To study the value and the superiority of multi-slice spiral CT angiography of pulmonary artery in combination with deep vein of lower limb in diagnosing pulmonary embolism (PE). Methods CT pulmonary angiography (CTPA) and lower limb deep vein venography were performed in all suspected patients of PE with single or multi-slice spiral CT.The number and type of the embolus were calculated.Results Among the 44 patents of pulmonary embolism,34 patents had both PE and deep vein thrombo embolism (DVT) ,10 patients had only PE.The total ratio of the PE diagnosed with single slice spiral CT and multi-slice spiral CT was 12.1% and 19.0%, respectively , there were statistical significance, (P=0.004); the ratio of the PE upon deuto-segment pulmonary arteries was 25.3% and 29.7%, respectively, there was no statistical significance, (P=0.104); the ratio of the PE below deuto-segment pulmonary arteries was 1.1% and 10.2%, respectively, there was statistical significance, (P=0.000).Conclusion The technique of angiography of pulmonary artery in combination with deep vein of lower limb in diagnosing PE is a non-invasive, fast, sensitive and specific method for PE. Multi-slice spiral CT is superior to single slice spiral CT in the diagnosis of PE.

0.05).Singnificant difference of p21 positive rates was showed between tumor lack of blood supplies and arterial blood (?

Objective To study the relationship among SCT features of tumor margin and tumor size, immunohistochemical findings, grade of cell differentiation, and to explore the potency of tumor marginal features on multiphase spiral CT for evaluating biological behavior of small hepatocellular carcinoma (SHCC).Methods Multiphase spiral CT scans were performed in 30 patients with 33 lesions of SHCC (≤3.0 cm in diameter) confirmed histopathologically. Of these patients,26 were male and 4 were female. Immunohistochemical and HE staining were performed in surgical samples of all patients with SHCC. All samples' size was measured and the number of masses in each patient was counted.Results Of all masses, 6 were complete capsule, 15 incomplete capsule and 12 non-capsule. In multiple linear regression analysis, the pseudocapsula presentation and completion of SHCC on SCT were positively related with tumor size and VEGF expression, negatively with CD34 and p21, and were not in association with p53 and histological grade. Tumor size was the strongest contributor to pseudocapsula completion(R=0.5115), and then VEGF(R=0.2917), CD34(R=-0.2981) and p21(R=-0.2726), which had the similar standardized regression coefficients.Conclusion Tumor size is the strongest relative factor that influenced pseudocapsula presentation and completion of SHCC. VEGF always expressed positively in SHCC with complete pseudocapsula, and negatively in the group of SHCC with incomplete pseudocapsula or without pseudocapsula. In the group of SHCC with incomplete pseudocapsula or without pseudocapsula, p21 always express positively. Neither p53 expression nor histological grade is in association with the pseudocapsula presentation and completion of SHCC on SCT.

Objective To explore the diagnostic index of the obesity with dual energy X-ray absorptiometry(DEXA).Methods The total and local parameters(the fat composition of the arm,leg,trunk and total body) in obesity group (135 cases) and the control group(75 cases) were measured with DEXA scan.The fat composition and distribution of body in the obesity and the healthy subject in different age and sex were analysed.The diagnostic index of obesity and healthy persons determined by DEXA.Results There was no significant difference between DEXA and the platform scale to weigh all the subjects.The fat content of the arm,leg,trunk and total body in the control group and the obesity group were respectively got.The P_5(the lowest limit of 95% confidence interval of obesity fat percentage)value of the obesity male was 23(P_5=23),while the female was 29(P_5=29)).There was no significant difference between DEXA and the BMI method in the positive result of the obesity.The total body fat content in the obesity group was higher than that of the control group in each age and sex group.The fat content of the female was higher than that of the male regardless of obesity group or control group.Conclusion The obese cut off point is 23% in male and 29% in female in the total body fat content.

Objective To evaluate the value of MRI in diagnosis of craniopharyngiomas. Methods MRI findings of 52 craniopharyngiomas were analyzed retrospectively and correlated with pathology.Results 37 cases of all 52 cases craniopharyngiomas were located on suprasellar. Craniopharyngioma fluid collections were found to be uniformly hyperintense on T 2-weighted images. However, on T 1-weighted images, the signal intensity of the fluid ranged from hypointense to hyperintense, reflecting the presence of pathological contents in these tumors. Conclusion MRI is an effective method in diagnosis craniopharyngioma due to its direct multiplanar capabilities and sensitive signal changes.

Objective To find the X-ray characteristic and diadynamic method in congenital defect of muscular layer in stomach wall. Methods Six cases confirmed by operation and pathology were collected,underwent eight standing abdomen plain films,underwent 5 decubitus abdomen plain films in 6 cases. Results The appearances in standing plain film of freeing gas under diaphragm, eventration of diaphragm, passing through the whole abdomen of gas and liquid plane, vanished gastriole were found in 6 cases. Superior border of liver was found in 4 cases.The appearances in decubitus abdomen plain films of abdominal distension, increasing gas gathered in umbilical region, vanshed fat line in abdominal wall were found in 4 cases. Conclusion Large part of typical cases could be diagnosis by x-ray and clinical appearance.

Objective To study the value in predicting the postoperative pulmonary function of the patient with quantitative MSCT.Methods 16-slice spiral CT scanning of lung was performed in 24 patients with pulmonary carcinoma before and after the operation during eupnea.Then the postoperative forced expiratory volume in one second(FEV1) and forced vital capacity(FVC)were calculated according to the preoperative lung capacity which was measured by quantitative MSCT,FEV1 and FVC which were measured by pulmonary functional test(PFT),then the results of FEV1 and FVC predicted by MSCT were compared with that two months later after operation.Results There was significant relativity in FEV1 and FVC between predicted by MSCT before operation and measured by PFT after operation ( P was 0.190 and 0.563 respectively).Conclusion Quantitative MSCT can predict the postoperative pulmonary function exactly,which provides dependable reference data for lung resection in the patients.with pulmonary carcinoma.

Objective To evaluate the applied value of MSCT lung volumes measurement in diagnosing chronic obstructive pulmonary disease(COPD).Methods 40 patients clinically diagnosed with COPD and 26 healthy volunteers as control group underwent MSCT chest CT scanning . The relevant indicators of lung volumes were measured and calculated in comparison with the indicators of clinical lung function . The accuracy and sensitivity of every indicator of lung volumes in forecasting and screening COPD by using ROC curve method were evaluated.Results There were significant differences between the control group and the COPD group in the full expiration volume(Vex),the full inspiration volume(Vin),Vex/Vin and the ratio of the change of lung volume(P

Objective To investigate clinical usefulness of intracranial lesions in pre-and post-operation by functional MRI with blood oxygen level dependent(BOLD)technique.Methods Common MRI and Motor hand area functional MRI examinations were performed in 45 patients (fMRI group)with intracranial lesions adjacent to the motor cortex before and after operation. As contrast group, 20 patients with occupying position lesions were made a routine MRI examination without fMRI before surgery. A 1.5 T signa super conducting system was employment (GE company ,America). Results The focal transactivation domain of cerebration was seen on fMRI in all cases of fMRI group. The cortical motor hand area shown displacement in 22 cases with abnormal size and shape and found not displacement in 23 cases. The distribution of transactivation domain was not changed in different disease . There was positive correlation between the distance from lesions to the domains and myodynamia in preoperation(r=0.553,P0.05). Our data indicated that there was negative correlation between the distance and the difference of myodynamia (r=-0.570,P