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《China Medical Equipment》 2013-07
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Study on reducing radiation dose in digital radiography of infant chest

ZHANG Xiao-ping,Department of Radiology,The First Affiliated Hospital of Hebei North University,Zhangjiakou 075000,China.HE Song,WU Wei,et al  
Objective:To investigate optimal exposure parameters for reducing radiation dose in digital radiography of the infant chest.Methods:Tissue-equivalent infant chest water phantoms were divided into groups according to the different thickness of copper additional filtration (0,0.1,0.2 and 0.3mm) and Tube voltage (60~100kVp).Then digital radiographies were taken on the phantoms with a line-pair gauge on them.Spatial resolution and noise level of images in groups were evaluated,meanwhile the incident dose on body surface and milliampere second (mAs) were recorded.Thirty infant patients underwent direct digital chest posteroanterior radiography with optimal exposure parameters and image quality were evaluated.Results:1) Background noise of images in groups may be accepted with the best resolving ability of 2.5LP/mm.2) The incident dose to body surface in the group (0.3mm;80kv) is lower than that in any other group,statistically difference was shown between any of the groups in terms of incident dose to body surface (q=5.368,q=2.29,q=2.98;P0.05).3) Using the same additional filtration,the incident dose to body surface decreased when kilovolts peak (kVp) increased form 60 to 80,but the incident dose increased slightly when kVp increased form 80 to 100 kVp.4) With the thickness of the additional filtration,the incident dose to body surface decreased but mAs increased.5) Chest posteroanterior images of 30 infants all conformed to diagnostic criteria.Conclusion:The use of thickened additional filtration,high tube tension of 80 kVp and AEC may reduce the incident dose to body surface in digital radiography of the infant chest.
【CateGory Index】: R144.1
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