低剂量CR在胸部摄影中的初步研究  

The Preliminary Study of Low-dose CR in the Chest Photography

作　　者：龚万庆[1,2] 陈爱华[1,2] 李丹[1,2] 张婷婷[1,2] 刘堃[1,2] 

机构地区：[1]三峡大学人民医院 [2]湖北省宜昌市第一人民医院放射科,湖北宜昌443000

出　　处：《中国医药指南》2015年第4期1-2,共2页Guide of China Medicine

基　　金：宜昌市医疗卫生科技计划项目(编号:A08302-15)

摘　　要：目的探讨通过降低胸部计算机X线摄影（CR）的辐射剂量获得优良影像质量的投照条件。方法收集160例健康体检低剂量胸部CR,低剂量组采用：120 kV,160 mA,16 ms,1.8 m距离站立位摄片;常规剂量组除曝光时间采用32 ms外,其他扫描参数同第一组。对160例健康体检者均行1.8 m距离站立位胸部CR摄片,按曝光时间不同分为两组,常规剂量组采用120 kV,160 mA,32 ms作为投照条件,低剂量组采用120 kV,160 mA,16 ms作为投照条件。结果 67例（83.75%）在16 ms及更小剂量条件下获得可以用于筛检的图像,对照组及低剂量组均无统计学差异。结论身高与体质量的比值〈0.9时可采用8 ms的曝光条件,其介于0.9-1.05时可采用16 ms的曝光条件,当其〉1.05时,应采用24-32 ms的曝光条件,作为筛查,不必使用更高的曝光条件。Objective To investigate the best exposure condition and the good quality of images by reducing the radiation dose of the computer radiography（CR） on chest. Methods 160 healthy subjects received CR examination on chest, standing with 1.8 meters from the tube. These cases devided into two groups according to the exposure time, one group with conventional dose received the exposure condition for 120 kV, 160 mA, 32 ms, while other group with lower dose received exposure condition for 120 kV, 160 mA, 16 ms. Results Sixty-Seven patients（83.75%） with the exposure condition for 16 ms and lower can be used for screening to get the good images, controlled group and the low dose group had no statistically significant difference. Conclusion The exposure condition could use 8 ms with the Height and Weight Ratio（HWT） less than 0.9, and 16 ms with 0.9-1.05, 24-32 ms with above 1.05. There wasn＇t necessary to use higher dose for general screening.

关 键 词：计算机X线摄影 胸部 低剂量摄片 

分 类 号：R445.4[医药卫生—影像医学与核医学]