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.

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 evaluate clinical application value of DWI and reservation of liver function in patients with chronic liver disease. Methods Thirty cases of healthy control group, and 60 case group with chronic liver disease,including both 30 chronic hepatitis B and 30 cirrhosis. liver function in case group was analysed by venous blood samples. Case groups were divided into three groups according to MELD score: ＜30 group in 27 cases, 30 to 36 group in 17 cases, ＞36 group in 16 cases. All cases underwent liver magnetic resonance DWI. Among the case group, 15 cases were followed-up twice of pre- and aftertreatment. DWI images were read, ADC values of liver parenchyma were measured and standardized with the cephalospinal fluid (CSF) at the same slice. Used SPSS 13.0 for windows to treat the data, group comparison of ADC values were treated by one-factor analysis of variance, interclass comparison each other by SNK method, comparison between pretherapy and post-treatment by paired-samples t test. Results Healthy liver parenchyma of the control group is homogeneous signal on DWI. ADC pseudo-color pictures showed green on the homogeneous areas. Slightly restricted area of chronic hepatitis B showed irregular scattered patchy in DWI images, 25 cases in right and left lobes, 5 cases only in right lobe of the liver. ADC pseudo-color pictures reaveled blue region in proliferation-constrained areas. Restricted areas of the liver parenchymal become more evident, also showed an irregular liver edge in 30 cases of cirrhosis. The standarized ADC average values were: the healthy group (0. 47 ±0. 02) × 10-3 mm2/s, chronic hepatitis B group (0. 37 ±0. 03) × 10-3 mm2/s, cirrhosis group (0. 36 ±0. 04) × 10-3 mm2/s( F =97.05,P ＜0. 05).The difference between healthy group and patients group was statistically significant (P ＜ 0. 05 ). No statistically significant difference between groups of chronic hepatitis B and liver cirrhosis ( P ＞ 0. 05 ).Average ADC values of MELD score among groups of ＜ 30, 30 to 36, ＞ 36 were ( 0. 38 ± 0. 02 ) ×10-3 mm2/s,(0.35 ±0.02) × 10-3 mm2/s, (0.32 ± 0.03) × 10-3 mm2/s respectively. There is a significant difference among the three groups (P ＜0. 05). After treatment, DWI of 15 patients with chronic liver disease showed reduction in restricted areas, and the average ADC value from pre-treatment (0. 33 ±0. 03) × 10-3 mm2/s increased to(0. 38 ±0. 03) × 10-3 mm2/s, MELD score from pre-treatment 36. 01 ±6. 00 reduced to 27. 83 ± 4. 86. Conclusion DWI of chronic liver disease showed patchy diffuse restricted areas; more severe of the liver cell damage was, more worse the liver function was and lower ADC values was. ADC values increased after effective treatment, liver function recoved and diffuse restricted areas of liver parenchyma reduced.

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 investigate effective MSCT perfusion index and evaluate its significance in the renal function of diabetic nephropathy patients.Methods The 64-slice spiral CT perfusion scanning was performed on experimental group with 25 cases dia-betic nephropathy patients and control group with 25 cases healthy volunteers.The index including the dual-renal blood flow (BF), blood volume (BV),mean transit time (MTT),and permeability of surface (PS)were measured.At the same time,the levels of microalbumin and urinary protein (mg/24 h)were quantitated,and the blood urea and serum creatinine were measured on diabetic nephropathy patients one day before and the second day after renal CT perfusion scanning.Results All indexes of renal MSCT per-fusion,which are BF,BV,MTT and PS,were associated with 24 h quantitative urinary protein and fasting blood-glucose.Only BF and MTT were related to microalbumin and in a good correlation with indexes of diabetic nephropathy (microalbumin,24 h quantita-tive urinary protein,and fasting blood-glucose).Within them,the BF value was negatively correlated to the indexes,and the MTT was positively correlated.The area below the ROC curve of BF and MTT was more than 0.8,it indicated the good effect for the in-dexes in diagnosis of diabetic nephropathy.The usage of non-ionic contrast agent in the renal perfusion scanning process has no sig-nificant impact on the measured index values.Conclusion MSCT renal perfusion index can be used to evaluate the renal function of diabetic patients.BF,BV and MTT could be used in prediction,diagnosis and screening of DN patients,among them BF and MTT indexes were the optimal.

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 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 evaluate the usefulness of imging techniques in diagnosis of corticosteroid-induced avascular necrosis of the femoral head(ANFH).Methods Twenty seven patients with avascular necrosis of the femoral head due to long-term corticosteriod treatment were analysed retrospectively.There were 16 femal and 11 male,ranged in age from 20 to 46 years(mean age 35.6 years).The course of disease was 1～5 years.The administration of corticoid orally was 60～25 mg/d taken on 6 months to 5 years.ANFH was appeared 3 months to 2 years after the administration of corticoid.The imaging examinations included radiography in 20 cases,MRI in 15 cases,both radiography and MRI in 10 cases and CT in 8 cases.8 cases were confirmed by operation and pathology.Results 7 femoral heads in 6 cases with early-ANFH were diagnosed by X-ray,21 femoral heads in 15 cases with early-ANFH were diagnosed by MRI and 11 femoral heads in 7 cases were by CT,19 femoral heads showed a typical “line sign”on MRI.Conclusion The “line sign” on MRI is regarded as the characteristic finding in early-ANFH.MRI is the most sensitive method in the early-diagnosis of the corticosteroid-induced ANFH and it can provide important evidence for clinical management.