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尽管CT检查仅占所有检查的2%,而对于公众诊断性成像的接收剂量,CT却占20%左右。具有10mSv有效剂量的成人腹部检查会增加致癌风险1/2000。儿童对于放射线影响的灵敏度是中年人的10倍多,女孩比男孩更敏感。剂量增加的原因有:CT应用的偏差、使用方便的结果、多层CT的危机、未意识到“非耦合效应”。医护人员要进行很好的培训,要意识到不断涌现的资料及实践中潜在的变化,根据进展修正方案。像进行传统X射线摄影一样,“合理使用低剂量(aslowasreasonablyachievable,ALARA)”原则也很适合于CT的应用。
Although computed tomography accounts for only 2% of all exams, CT accounts for about 20% of received doses for public diagnostic imaging. Adult abdominal examination with an effective dose of 10 mSv can increase the carcinogenic risk by 1/2000. Children are more than 10 times more sensitive to radiation than middle-aged adults and girls are more sensitive than boys. The reasons for the increase are: deviations in CT application, easy to use results, multi-slice CT crisis, unaware of “uncoupling effect.” Health care workers have to be well trained, be aware of emerging information and potential changes in practice, and revise programs based on progress. Like traditional X-ray photography, the principle of “as low as reachableably sensitive (ALARA)” is also well suited for CT applications.