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.

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.

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 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.

0.05). Homogenous or inhomogenous high signal in aplastic anemia were detected with decreased T 1 value. Homogenous iso-intensity was revealed in acute pure red cell aplasia with normal T 1 value. Aplastic anemia and acute pure red cell aplasia had a homogenous signal on T 2WI, their T 1 value showed significant difference (P

Objective To evaluate the MRI in the diagnosis of aplastic anemia (AA) and MRI changes after therapy. Methods MR imaging of lumber spine in 16 patients with AA proved pathologically were performed on 0.5 T superconductive MR unit with T 1WI, T 2WI, and STIR, slice thick 5 mm, slice gap 1 mm, matrix 180?256. Thirty cases of normal volunteers were examined as control group. Lumber spines of the two groups were studied by observation of MRI findings, measurement of the T 1 relaxation value. In AA group, the percentage of the hypointense signal areas in the centrum was calculated. Results Three patterns were classified by MR appearance in lumber spine of our cases. MR findings of pattern 1 (2 cases) were hyperintense on T 1WI, isointense on T 2WI, and hypointense on STIR, and all two cases were acute aplastic anemia (AAA). In pattern 2 (7 cases), a few irregular hypointense signals appeared in the background of hyperintense signal on all 3 sequences, and 5 of them were AAA. Pattern 3 (7 cases) demonstrated mixed irregular shape of hyperintense and hypointense signals, all 7 cases were chronic aplastic anemia (CAA). The percentage of the area of hypointense signal in AAA was significantly smaller than that in CAA (t=30 00, P

Objective To evaluate the diagnostic value of MRI and X ray and to analyze MRI and X ray characteristics in Med anemia Methods MRI was performed in thoracic spine,lumbar spine, sacral spine,pelvis,and superior femurs in 15 patients with pathologically proved Med anemia with T 1WI and T 2WI Seven of them were examined on X ray Twenty volunteers were examined on MR as control group The authors analyzed the manifestations of MRI in the Med anemia, including abnormality of signal intensity of bone marrow,T 1 value,vertebral alteration of size and shaped, spinal cord compression due to epidural extramedullary haematopoiesis, and compared with the findings of bone on X ray Results In the control group, bone marrow showed an inhomogeneous iso signal intensity with band shaped, triangular or motley high signal intensity in the middle or back part of the vertebra, neck of the femur on T 1WI and a homogeneous iso signal intensity on T 2WI in the vertebra, pelvis, and superior femur All cases with Med anemia had low homogenous signal intensity in the bone marrow of the vertebra, pelvis and superior femur on T 1WI but had no alterations on T 2WI The spinal cord was constricted resulting from protruding crushed vertebra with bullet like shape in 4 cases The soft tissue masses, confirmed as extramedullary haematopoiesis by operation, were demonstrated in 4 cases Among 7 cases with X ray examinations, 2 cases showed normal on X ray but abnormal bone marrow on MRI, another 5 cases demonstrated bone alteration including osteoporosis, widening of striations, enlargement of ribs and vertebras T 1 value showed (897 4?75 43)ms in the Med anemia group and (401 5?28 1)ms in the control group with significant statistical difference ( 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