X线曝光量对显示器影像质量的影响  

The effect of X-ray radiography exposure intensity on image quality of the monitor

作　　者：曹允希[1] 刘慧琴[1] 邱建峰[1] 何乐民[1] 韩丰谈[1] 景学安[2] 

机构地区：[1]泰山医学院放射学部,泰安271016 [2]泰山医学院基础医学部,泰安271016

出　　处：《中华放射学杂志》2008年第10期1056-1058,共3页Chinese Journal of Radiology

摘　　要：目的观察数字X线摄影（DR）系统不同曝光量与影像质量的关系。方法选择摄影管电压90kV、曝光量从0．5～16．0mAs变化时，使用X线摄影系统对Cdrad2．0对比度细节体模进行曝光，观察者对显示器的影像进行阅读，计算其影像质量因子（IQF）。统计方法采用随机区组设计的方差分析（ANOVA），对8名检查者不同曝光量下测得IQF均值进行F检验，P〈0．05为差异有统计学意义。结果（1）管电压90kV，曝光量从0．5～8．0mAs变化时，随着曝光量的增大，观察者在显示器上观察到IQF逐渐减小，最小为38．54±2．82，曝光量从8．0—16．0mAs变化时，IQF逐渐增大，最大为44．334-2．35。（2）不同曝光条件下，IQF差异有统计学意义（F=60．35。P〈0．01）。结论随着X线摄影曝光量的增大，显示器图像分辨能力逐渐提高，摄影曝光量为8．0mAs，影像质量最佳，曝光量〉8．0mAs，显示器对图像细节的显示能力开始下降。Objective To explore the relationship between image quality and different exposure intensity of digital radiography （ DR）. Methods Using a contrast-detail phantom Cdrad 2. 0, observers evaluated images on the monitors when exposure parameters were 90 kV and mAs ranged from 0. 5 to 16. 0 mAs. Then calculate image quality figure （IQF）, and ANOVA was used to analyze the difference of IQF under different radiation dose in 8 subjects. Results （ 1 ） When exposure parameters were 90 kV and mAs altered from 0. 5 to 8. 0 mAs, the IQF observed on the monitor was reduced, and the minimal value was 38. 54 ±2. 82. When mAs changing from 8.0 to 16. 0 mAs, IQF observed on the monitor was increased,and the maximum was 44. 33 ±2. 35. （2） Under the different exposure condition, the difference of IQF values were statistically significant （ F = 60. 35, P 〈 0. 01 ）. Conclusions With the increased exposure intensity, the image quality on monitor increased. When mAs was 8.0 mAs, image quality was the optimum. When mAs was more than 8. 0 mAs, the image quality on monitor reduced.

关 键 词：放射摄影术 计算机终端 放射学信息系统 

分 类 号：R686[医药卫生—骨科学]