Objective To study CT findings, diagnosis and differential diagnosis for prostate cancer. Methods 28 cases with prostate cancer confirmed by surgery and pathology, of them 4 cases were recurrence after operation. Results In 24 cases confirmed by surgery 21 (87.5%) were diagnosed by CT. Their CT appearances were : (1) Focus: in non enhanced scanning the prostate was enlarged unevenly in 18 cases. The density of the mass was slightly lower than the normal prostate in 17 cases, and equal to normal in 11 cases. Patchy calcification was seen in 2 cases moderate. In enhanced scanning, 22 cases showed nodular enhancement but slightly less than normal, 6 cases were equal to normal. (2) Metastastic lesions: 8 cases had local thickened bladder wall, 4 cases had enlarged seminal vesicle with unneven density, 2 cases with thickened anterior wall of rectum.And pelvis mass, enlarged lymph nodes, bony destruction of pelvis and pulmonary metastasses 1 case for each respectively. Conclusion (1) It is emphasized enhanced CT study should be a routine examination in the diagnosis of prostate cancer by CT; (2)CT can define the extent of the lesion and metastases thereby helpful to predict the prognosis and evaluate the effect of treatment.

According the development requirement of medical imaging skill,centered on diseases,we discussed the teaching reform of imaging diagnostics course,including the optimized integration of the course,bilingual teaching,teaching methods,format of subject test and strengthening practice teaching,hoping to improve the whole team' professional quality.

Objective To discuss correlation of hemodynamic changes and portal vein diameter with multi-slice spiral CT peffusion imaging in liver cirrhosis. Method 31 cases liver cirrhosis were enrolled in this study. The first porta hepatis were selected for target lay of CT perfusion scan. Liver perfusion parameters were obtained by color perfusion map method. Right to left diameter and occipitofrontal diame-ter of portal vein were measured. 30 cases of normal persons were used as control group. Result Hepatic arterial perfusion (HAP) in liver 0.05). Hepatic perfusion index (HPI) were (19.13±3.33)% and (20.61±8.56)%, which had no statistically significant difference with the other two groups (P>0.05). Conclusion Multi-spiral CT perfnsion imaging is an effectively noninvasive method to evaluate the hemodynamic changes of liver cirrhosis. Occipitofrontal diameter of portal vein with liver cirrhosis can reflect the state of liver hemodynamics.

Objective To evaluate the value of dual echo technique in combination with apparent diffusion coefficient(ADC) in differentiating acute benign vertebral fracture from metastasis.Methods 43 patients (mean age, 68.2 years) with 79 metastatic vertebrae and 59 patients(mean age,60) with 68 acute vertebral fractures were included in our study.The slices of largest size of lesion on T1WI were selected to measure and calculate the signal intensity ratio(SIR) and ADC of lesions.The difference of ADC values and SIR between benign acute vertebral fractures and vertebral metastasis were compared.Parallel test,serial test and receiver operating characteristic curve(ROC) analysis of logistic model were done.Results ADC values of metastasis and acute benign fracture were (1.32±0.5)×10~（-3）mm~2/s and (2.39±0.4)×10~(-3)mm~~2/s respectively,and SIR of them were 1.00±0.01 and 0.85±0.01 respectively,there were significantly different between these two entities with the two tests(P<0.05).The area under the curve(AUC) for SIR was 0.897 and for ADC was 0.960,there is significantly different between these two tests in AUC(P=0.02).When 0.97 as cut off value for SIR,the sensitivity and specificity were 84.81% and 76.47%% respectively,when 1.87×10~(-3)mm~2/s as cutoff value for ADC , the sensitivity and specificity were 93.67% and 91.18% respectively . The sensitivity and specificity were 99.04% and 69.73% respectively in the parallel tests and 79.44%,97.92% in the serial test.A combining predictor established with logistic regression model showed a high AUC:0.985,which was higher than that of ADC and SIR alone.The AUC under ROC for ADC was significantly larger than that of SIR . When 0.55 as cut off value for this combining predictor , the sensitivity and specificity were 98.73% and 95.59% respectively.Multiple comparisons were performed with LSD-t test :combining predictor>ADC>SIR,it showed that there was significantly different between indexes(P<0.05). Conclusion ADC in combination with SIR can improve the effects in differentiating benign acute vertebral fractures and vertebral metastasis.

Purpose:To discuss the relationship between the extent of red pseudocolor of pseudocolor CT image and MVD in lung carcinoma.Materials and Methods: The CT angiography was performed by using 16-slices spiral CT in 25 cases with pulmonary carcinoma,proved by pathology.Pseudocolor VR of tumor lesions of pulmonary carcinoma was performed.The immunohistochemical test of MVD of tumor lesion of pulmonary carcinoma was performed in 25 cases.The relation between the extent of red color on pseudo color VR and MVD of tumor lesion of pulmonary carcinoma were analyzed.Results: The extents of red pseudocolor of tumor lesion on VR pseudocolor Imaging were divided to four types: heavy ( n = 5 ),moderate ( n - 8 ),light (n = 9 ),no color( n = 3 ).The add CT values of tumor lesion after enhanced CT were 26.32 ±9.17Hu in 13 cases with heavy or moderate group,10.87 ±4.257Hu in 12 cases with light or no red color group.The numbers of MVD of tumor lesion of pulmonary carcinoma were 57 ±6.43 in 13 cases with heavy or moderate group,19 ±5.29 in 12 cases with light or no red color group.The numbers of MVD of pulmonary carcinoma had statistical significant between heavy or moderate group and light or no red color group.Conclusion:It has a significantly direct correlation between the extent of red pseudocolor of tumor lesion on pseudocolor image and MVD of tumor lesion in pulmonary carcinoma.

Objective To investigate the effect of the courses of image diagnostics on clinical pro-bation period via the combination of PBL and multimedia network teaching model. Methods 126 under-graduates from the department of medical image (Grade 2011 and 2012) were selected as teaching subjects, and PBL combined with multimedia network teaching was adopted in the teaching of the course of medical imaging diagnosis. After class we implemented a questionnaire survey, and let the students write learning experience. Statistical analysis was conducted by using SSPS 13.0 to reflect the teaching participation in the students' questionnaire and a. summary analysis of the learning experience of the students was also made. Results 123 valid questionnaires were collected. 94.31%(116 people) of students were active participants in these courses, 90.25%(111 people) of the students thought they could actively communicate in teaching, and 43% (110 people) of the students thought they got fully prepared before class. 123 articles in accor-dance with the requirements of experience were received; most students took positive attitude to the active influence the teaching methods had brought; some student pointed out that the teaching method had the disadvantages such as too much time to prepare, too much information, and so on. Conclusions The com-bination of PBL and multimedia network teaching has preliminary results. It is a novel model that is available for teaching image diagnostics on clinical probation period.

Objective To explore the application value of 320-slice spiral CT myocardial perfusion technique in the evaluation of cardiac function in patients with coronary artery disease.Methods 24 patients with known reversible myocardial ischemia with coro-nary heart disease and 13 cases of normal were detected by 320-slice spiral CT myocardial perfusion scan in resting and after dobu-tamine-induced stress,measured the values of cardiac function indexes(ESV、EDV、SV、EF)in resting and after dobutamine-induced stress respectively,the results were analyzed by paired t test and independent sample t test,when the P value is less than 0.05,con-sidered statistically significant or correlation.Results The values of cardiac function indexes (ESV,EDV,SV)between the resting and after dobutamine-induced stress were significantly different except EF value in normal group.But only the EF value was signifi-cantly different in CHD,the rest values of cardiac function indexes(ESV,EDV,SV)no significant difference.Each corresponding value of cardiac function indexes in resting and after dobutamine-induced stress was significantly different between the CHD and the normal.Conclusion The dobutamine-induced stress myocardial perfusion with 320-slice spiral CT can judge the impaired degree of cardiac function in patients with myocardial ischemia,provide the basis for comprehensive evaluation of coronary artery disease and its prognosis.

Objective To understand the carrying status and drug resistance of streptococcus agalactiae in the genital tract of pregnant women.Methods The vaginal discharge from pregnant women was collected for conducting the bacterial culture.The iso-lated streptococcus agalactiae was performed the identification and the drugs susceptibility test by the VITEK 2 fully automatice bacterial identification analyzer.Results Among 1 042 samples,streptococcus agalactiae was isolated in 6 cases with the separation rate of 5.4%.The drug sensitivity test showed the Streptococcus agalactiae was highly sensitive to penicillin,cefazolin,vancomycin, linezolid and nitrofurantoin.The intermediate strains or drug resistant strains were not found.The sensitive rate to levofloxacin, moxifloxacin and clindamycin,erythromycin,tetracycline were 84.0%,84.0%,71.4%,39.3% and 8.9% respectively.Conclusion The carrying rate of streptococcus agalactiae in pregnant women is not high in our hospital.Penicillin and cefazolin should be as the drug of first choice for therapy and the clincal and laboratory nould payattention to detection of streptococcus agalactiae in pregnant women.

Objective To evaluate the diagnostic value of low-dose volume perfusion imaging with 320-detector CT in differentia-ting solitary pulmonary nodules (SPNs).Methods 130 patients with 130 SPNs (79 malignant tumors,1 6 active inflammations,1 6 benign nodules and 1 9 chronic inflammations)underwent contrast-enhanced dynamic volume perfusion CT prospectively.50ml of contrast medium with iodine concentration of 370 mg I/mL was injected at a flow rate of 5 mL/s,and the scan began at 0 second or 4 seconds after the bolus injection.20 or 21 intermittent low-dose volume acquisitions were made with 2 s intervals,and the total ac-quisition time was 38 s or 40 s.Post-procession was performed using a perfusion software on the CT (Body Perfusion,Dual-input single compartment mode).The perfusion parameters (PF,BF,PPI),T-DC and TPF were measured or calculated,and then as-sessed.Results PF and PPI of active inflammation nodules showed significant higher value than those of the other three kinds of nodules,and there were significant differences in PF and PPI between active inflammation nodules and other kinds of nodules.The value of BF in malignant nodules was higher than that in the other three kinds of nodules,however no statistic significant difference in PPI was found between malignant and chronic inflammation nodules.The value of TPF in malignant and active inflammation nod-ules was higher than that in benign and chronic nodules,and there were statistic significant differences between malignant and active nodules and chronic ones.Six types of T-DC were displayed on SPNs:malignant,benign and chronic nodules showed a variety of T-DC types,and active inflammatory nodules showed only one type-typeⅠ.Conclusion Low-dose volume perfusion technique with 320-detector row CT can provide abundant information about blood flow of SPNs,and it may be regarded as an important technique in the differential diagnosis of SPNs.

Objective To analyze MRI manifestations of huge tumors in ovary and adnexal,to improve qualitative diagnosis and differential diagnosis ability.Methods Thirty-one female patients with huge tumor in pelvic cavity confirmed by surgical pathology underwent preoperative MRI plain scan,DWI and enhancement scan.MRI features were retrospective analysis and compared with pathological results.MRI manifestations included the tumor size,signal intensity,ADC value of the cystic component,ADC value of the solid component and enhanced index.Then,statistical analysis was carried out.Results The mean size of the benign ovary and adnexal tumors was (103.04±32.75)mm,and that of the malignant was (139.29 ±49.20)mm.There was no statistical difference between the two groups (P＞0.05).The number of cystic lesions in the benign group was significantly higher than in the malignant group,while the number of the cystic-solid and solid lesions in the benign groups were obviously lower than in the malignant group.The signal intensity of the lesions was statistically different between the two groups (P＜0.05).The enhanced index in the malignant group (53.15±13.78)was significantly higher than in the benign group (3 5.3 9 ±8.1 2)(P＜0.05).Moreover,the AUC was 0.8 6 1 ,indicating that the diagnostic effect was good.There were no statistical differences in the tumor size,ADC value of the solid component and the cystic component (P＞0.05).Conclusion Benign ovary and adnexal tumors are mostly cystic,while malignance are mostly solid-cystic and solid.Enhanced index is helpful for identifying benign and malignant ovary and adnexal tumors.ADC value of cystic and solid component are not useful to identifying benign and malignant tumors.MRI is powerful in diagnosing huge tumor in female genital system and help to qualitative diagnosis.