Objective To evaluate the influence of various parameters in images by digital radiography (DR).Methods Analysis of exposure parameters and the parameters of various parts of the image in 1000 cases of chest images by DR.Results The 90kV group of exposure time[(13.05 ±4.92)ms]were greater than 125kV group [(7.72 ±2.65)ms]and 150kV group[(5.65 ±1.81)ms](t =2.245.P ＜0.05;t =2.812,P＜0.01);90kV group [(0.86±0.29)cGy ? cm2](t =2.311 ,P ＜0.05);90kV group of Conversion factor(CF)14.8 ±4.52 lower than the l25kV group(19.5±5.48)and 150kV group(22.9 ±6.44)(t =2.298,t =2.301 ,P ＜0.05);The exposure of patients significantly related to Body Mass Index(BMI(r = 0.678 ,P ＜0.05);The average window of rib in 2018 were higher than left ventricular after lung markings,hilar structures、thoracic tracheal and protuberans(1584,1850,1554 and 1476)(t = 2.114,t= 2.241,t= 2.295,t= 2.304,both P＜0.05);The average Wide Window of rib in 2677 were higher than the trachea and thoracic protuberans(2383 and 2128);The 1000 of rib clearly were significantly higher than 754 cases of thoracic(t = 2.214,P ＜ 0.05).Conclusion The appropriate parameters can be more satisfied with the images.

Objective To investigate the imaging parameters in hepatic angiagraphy using multi-slice CT angiography(MSCTA).Methods The imaging parameters in 80 cases of healthy persons and 90 cases with liver cirrhosis were analyzed.The value of CT with abdominal aorta(AA) ;portal vein(PV) and liver(L) were measured respectively.To compare peak;peak time;liminal value;delay time and image quality at AA;PV;L;PV-L under different injection flow rate.Results The AA maximum peak[(223.9±16.7)Hu,(273.3 ± 12.7)Hu,(301.3 ±14.6)Hu]higher than the PV-L[(65.1 ± 9.5 ) Hu,(83.7 ± 17.9) Hu,(96.5 ± 15.6) Hu ]( P＜0.01 ) ;AA reached the peak hours[(46.6 ±3.8)s,(36.2 ±6.5)s,(31.4 ±5.8) s]lower than the PV-L[(56.6 ±4.2)s,(49.6 ± 5.0) s,(41.6±5.8)s](P ＜0.05) in different injection flow rate(2.5ml/s,3.5ml/s,4.5ml/s) ;The 4.5ml/s group in MSCTA show(hepatic artery:A grade 15 cases,B grade 4 cases,C grade 1 case,D grade 0 case,the portal vein:A grade 15 cases,B grade 4 cases,C grade 1 case) were significantly higher than 2.5 ml/s group( hepatic artery:A grade 4 cases,B grade 5 cases,C grade 10 cases,D grade 3 cases,the portal vein:A grade 2 cases,B grade 12 cases,C grade 6 cases) (all P＜0.01 ).The value of liminal(180-220Hu) in hepatocirrhesis group were lower than 150-180Hu in normal group(P＜0.05).Conclusion The right MSCTA imaging parameters Could improve the image quality in patients with liver cirrhosis.

Objective To study the clinical value of treatment for malignant bone tumors by interventional chemoembolization combined radiotherapy.Methods Forty-four patients with malignant bone tumors were divided into two groups.In the study group(group A),29 cases were treated by infusion of lipiodol with chemotherapeutic drugs,and the tumor feeding arteries were embolized with PVA partials and Gelatin sponge or steel coils,then regional radiotherapy were administered regularly.In the control group(group B),15 cases received radiotherapy and systemic chemotherapy.All the cases were followed up for 6 to 36 months.Results Marked improvement of the symptoms and tumors decreased in size and volume in patients of group A was noticed.Six of them were operated successfully.The 6-,12-,36-month local control rates in group A were 3.5%,13.8% and 51.7%.and the(6-),12-,36-month survival rates were 100.0%,93.1% and 48.3%.The difference of local control rates and the difference of survival rates between the two groups were significant(P