增感屏／胶片与CR胸部X线摄影适宜曝光条件比较的实验研究  

Comparative Study between on Exposure Parameters in Chest Radiography with Screen/Film and CR

作　　者：凌寿佳[1] 农俊彬[2] 黄邻彬[1] 谢萍 张会敏 黄仲奎[1] 龙莉玲[1] 陈掌凡[1] 宋瑞[1] 李春燕[1] 

机构地区：[1]广西医科大学第一附属医院放射科,广西南宁530021 [2]广西百色市人民医院放射科 [3]广西疾病控制中心

出　　处：《实用放射学杂志》2009年第8期1195-1197,共3页Journal of Practical Radiology

基　　金：广西壮族自治区卫生厅自筹经费科研课题（Z2007092）.

摘　　要：目的探讨胸部正位增感屏／胶片（屏／片）与CR摄影的合理曝光条件问的剂量差异。方法以10mAs、20mAs、40mAs档，分别从50～150kVp、步长为2kVp对实验猪胸部进行系列曝光，用剂量计记录每次曝光的入射点的入射X线剂量、肺野和纵隔处的透射X线剂量，然后进行胸部屏／片和CR摄影，从屏／片摄影中找出最佳质量的X线片及其对应的曝光剂量，在噪声不影响观察情况下，找出曝光量最低的CR图像及其对应的合理曝光剂量，比较适宜曝光剂量与合理曝光剂量的差异。结果感蓝片的适宜曝光剂量比CR合理曝光剂量低，两者差异有统计学意义（P〈0．01）。结论在胸部摄影中CR合理曝光条件要比屏／片适宜曝光条件为高。Objective To investigate the differences of exposure dose between screen-film and CR in the chest orthotropic radio-graphy. Methods The chests of experiment pigs underwent serial X-ray exposure with 10 mAs,20 mAs and 40 mAs respectively,from 50 kV to 150 kV,and 2kV of step length. The incident X-ray exposure dose and transmisson X-ray close alter the lung field and mediastinum were measured with dosimeter,then chest radiography was done respectively with screen/film and CR, the bestquality X-ray film from the screen-film photography and the corresponding appropriate dose were selected. The CR image with lowest dose of exposure as reasonable exposure parameters was selected. The differences of appropriate exposure parameters and reasonable exposure parameters were compared. Results Blue-chip sense of the appropriate exposure dose was lower than that of CR, there was significant difference between them（P〈0.01 ）. Conclusion In the chest photography,the CR reasonable exposure parameter is high than that in screen/film.

关 键 词：X线摄影 计算机X线摄影 曝光剂量 动物 实验 

分 类 号：R814.43[医药卫生—影像医学与核医学] R814.42[医药卫生—放射医学]