Study on public dose burden in Suzhou from medical exposure in X-ray digital radiography and computed tomography / 中华放射医学与防护杂志

Objective@#To estimate the effective dose burden to the public in Suzhoui induced by medical exposure from computed tomography (CT) and digital radiography (DR).@*Methods@#Twenty-seven hospitals were selected by stratified random sampling. The application information was colleted from picture archiving and communication system (PACS) and radiology information system (RIS). For DR, DAP was measured by the dose-area product meter in different body parts, then the effective dose values were calculated by the DAP. For CT, effective dose was estimated by measuring CT dose index weighted (CTDIw) and scanning parameters in different parts of the body. The public dose burden caused by DR and CT medical exposure in Suzhou was estimated according to the scanning time and effective dose to each part.@*Results@#The effective dose due to DR examination was abdomen AP 0.565 mSv, pelvis AP 0.280 mSv, skull LAT 0.016 mSv, skull AP 0.012 mSv, chest LAT 0.111 mSv, chest AP 0.060 mSv, thoracic spine LAT 0.100 mSv, thoracic spine AP 0.102 mSv, lumbar spine LAT 0.307 mSv and lumbar spine AP 0.152 mSv, respectively. The effective doses from CT scanning were 1.33 mSv for head, 5.75 mSv for thorax and 7.31 mSv for abdomen, respectively. The annual collective effective dose in Suzhou in 2017 from DR exposures and CT scans was 9 593.07 man·Sv, and the average annual effective dose was 0.898 mSv.@*Conclusions@#The contribution of CT medical radiation to the public dose is much greater than that of DR. Controlling the frequency of medical exposure and single scan dose is an effective way to reduce the public dose burden. The public dose burden from DR and CT medical exposure in Suzhou is at a high level and attention needs to be paid by relevant health administrative departments.

Study on public dose burden in Suzhou from medical exposure in X-ray digital radiography and computed tomography / 中华放射医学与防护杂志

Objective To estimate the effective dose burden to the public in Suzhoui induced by medical exposure from computed tomography (CT) and digital radiography (DR).Methods Twenty-seven hospitals were selected by stratified random sampling.The application information was colleted from picture archiving and communication system (PACS) and radiology information system (RIS).For DR,DAP was measured by the dose-area product meter in different body parts,then the effective dose values were calculated by the DAP.For CT,effective dose was estimated by measuring CT dose index weighted (CTDIw) and scanning parameters in different parts of the body.The public dose burden caused by DR and CT medical exposure in Suzhou was estimated according to the scanning time and effective dose to each part.Results The effective dose due to DR examination was abdomen AP 0.565 mSv,pelvis AP 0.280 mSv,skull LAT 0.016 mSv,skull AP 0.012 mSy,chest LAT 0.111 mSv,chest AP 0.060 mSv,thoracic spine LAT 0.100 mSv,thoracic spine AP 0.102 mSv,lumbar spine LAT 0.307 mSv and lumbar spine AP 0.152 mSv,respectively.The effective doses from CT scanning were 1.33 mSv for head,5.75 mSv for thorax and 7.31 mSv for abdomen,respectively.The annual collective effective dose in Suzhou in 2017 from DR exposures and CT scans was 9 593.07 man · Sv,and the average annual effective dose was 0.898 mSv.Conclusions The contribution of CT medical radiation to the public dose is much greater than that of DR.Controlling the frequency of medical exposure and single scan dose is an effective way to reduce the public dose burden.The public dose burden from DR and CT medical exposure in Suzhou is at a high level and attention needs to be paid by relevant health administrative departments.

Application of Pareto Analysis in Studying DR High Fault Rate / 中国医疗器械杂志

OBJECTIVE@#To explore the effect of Pareto analysis on the investigation of DR (Digital Radiography) high fault rate.@*METHODS@#The quality control team was established to analyze the causes of DR high fault rate by using the fault statistics of eight DR in our hospital for nearly three years,and to formulate and implement countermeasures,then compare them with the data after rectification.@*RESULTS@#After three months of implementation,the number of DR faults in our hospital decreased from 130 times/quarter to 47 times/quarter,a year-on-year drop was 63.8%.Among them,the number of console faults decreased from 105 times/quarter to 25 times/quarter,a year-on-year drop was 76.2%,close to 80%.@*CONCLUSIONS@#Pareto analysis is effective in reducing DR fault rate and is worthy of being promoted to other medical devices.

Investigation and analysis on entrance surface dose of patients in radiography procedures in China / 中华放射医学与防护杂志

Objective To investigate the entrance surface dose to the examined patients in radiography using digital and screen-film system in hospitals at different levels in 15 provinces and municipalities in China,in order to provide data for developing diagnostic reference level of radiography suitable for our national physical characteristics.Methods According to the requirements of the Technical Study on Medical Radiation Hazard Assessment and Control,the examined patients aged 20-70 years were selected,with body weight ranging from 55 to 80 kg for male and 50 to 70 kg for female.TLDs were used to measure the entrance surface dose to adult patients in radiography.No less than 10 examined patients were required at each body position,with examined locations including head (PA,LAT),chest (PA,LAT),abdomen (AP),pelvis (AP),lumbar (AP,LAT),and thoracic vertebra (AP,LAT).Results A total of 19 975 individuals undergoing radiography and 1 813 radiographic equipment of different types including screen-film radiography,computed radiography (CR) and digital radiography (DR),were investigated in 342 hospitals in 15 provinces and municipalities throughout the country.For these three types of equipment,the average entrance surface dose to the examined were 1.75,1.9,and 1.15 mGy in head (PA),1.69,1.46and 1.03 mGy in head (LAT),0.75,0.65 and 0.36 mGy in chest (PA),1.81,1.26 and 0.88 mGy in chest (LAT),4.37,3.77 and 2.15 mGy in abdomen (AP),3.73,3.56 and 2.75 mGy in pelvis (AP),5.49,5.84 and 4.17 mGy in lumbar (AP),12.01,9.37 and 6.82 mGy in lumbar (LAT),4.53,3.65 and 2.49 mGy in thoracic vertebra (AP),and 6.91,6.43 and 4.15 Gy in thoracic vertebra (LAT).Conclusions Entrance surface dose caused by radiography examination varies dependent on different exposure locations.Entrance surface doses caused by digital radiography are all lower than by screen-film radiography;those caused by digital radiography are lower than by computed radiography,except for thoracic vertebra (AP).In all examinations,no difference of statistical significance is found between CR and screen-film radiography in entrance surface dose.

Statistics and analysis of detection data for radioactivity performance of DR / 中国医学装备

Objective: To analyze and research detection data of radioactivity performance of digital radiography (DR) equipment so as to provide reference for purchasing DR equipment in hospital. Methods: Through collected the analysis results of detection data of quality control of 153 DR equipment of third level 1st class hospital, third level 2nd class hospital and county level hospital of Yunnan province. The comparison analysis about these DR equipments depended on the hospital type, nationality of equipment and duration of service. Results: There were 50 DR equipment and 103 DR equipments in the third level 1st class hospital and the third level 2nd class hospital, respectively. And in the third level 1st class hospital, there was 79.17% of DR equipments was imported equipment, while it was 51.45% in the third level 2nd class hospital. Besides, the duration of service of the most of DR equipments was 0-4yeras in the third level 2nd class hospital, while it was 5-7 years in the third level 1st class hospital. Conclusion: Most of the DR equipments in the third level 1st hospitals are imported equipment, and their duration of service were longer. On the other hand, in the comparison between imported equipment and domestic equipment, there are a certainly gap in quality stability, reliability and other aspects.

Application value of computed radiography energy subtraction in detecting pulmonary soft-tissue:comparison with direct digital radiography / 中华放射医学与防护杂志

Objective To compare the efficiency of computed radiography energy subtraction (ES-CR) with direct digital radiography (DR) in detecting the pulmonary soft-tissue signals.Methods The adult chest phantom including TRG was imaged by ES-CR and DR separately and was estimated by 6 radiologists with 5-value-differentiation method. ROC was used to analyze the performance of two systems. Images of DR and ES-CR of 28 patients with small lung cancer were diagnosed by 3 radiologists. Results The area under the ROC curves was 0. 727 in ES-CR and 0.827 in DR (Z= 2.96,P ＜ 0. 05). 28 small lung cancer patients were significantly different between two systems (x2 = 5.14,P ＜0. 05). Conclusions The true positive proportion of DR might be higher than that of ES-CR. ES-CR is inferior to DR in detecting pulmonary soft-tissue signals.

Discussion on application value of CR and DR / 医疗卫生装备

According to the comparison of CR and DR in such aspects as principle analysis,main parameters,software operation capability and development prospects,along with our experience,it is concluded that CR is now fit for the middle and small hospitals as an expedient intergrading digital image equipment,while for the hospitals with workload of over 100 persons per day,DR should be the primary digital image equipment and CR should work as auxililiary digital image equipment.

Application of the Mobile DR System in Large-scale Physical / 医疗卫生装备

Objective To discuss the application value of the mobile DR in large-scale physical examination. Methods Compared each 500 chest images that collected for the physical examination by the mobile DR, direct digital radiography(DR), then did another comparison about each 300 chest images of mobile DR and phnendoskiascope, recorded them by no displayed, displayed and limpid-displayed. Results The resolution of images collected by the mobile DR was comparative with the ones collected by direct digital radiography, better than phnendoskiascope in showing details. Conclusion The mobile DR images have a good resolution ratio as DR images have, meanwhile, this machine is easy to be taken and removed Examination while DR could not, and therefore the machine can do large-scale physical whatever inside or outside.