CAJ | 학술논문

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90 kV、曝光量从0.5～16.0 mAs变化时,使用X线摄影系统对Cdrad 2.0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90 kV,曝光量从0.5～8.0 mAs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8.0～16.0 mAs变化时,IQF逐渐增大,最大为44.33±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8.0 mAs,影像质量最佳,曝光量＞8.0 mAs,显示器对图像细节的显示能力开始下降.
목적 관찰수자X선섭영(DR)계통불동폭광량여영상질량적관계.방법 선택섭영관전압90 kV、폭광량종0.5～16.0 mAs변화시,사용X선섭영계통대Cdrad 2.0대비도세절체모진행폭광,관찰자대현시기적영상진행열독,계산기영상질량인자(IQF).통계방법채용수궤구조설계적방차분석(ANOVA),대8명검사자불동폭광량하측득IQF균치진행F검험,P＜0.05위차이유통계학의의.결과 (1)관전압90 kV,폭광량종0.5～8.0 mAs변화시,수착폭광량적증대,관찰자재현시기상관찰도IQF축점감소,최소위38.54±2.82,폭광량종8.0～16.0 mAs변화시,IQF축점증대,최대위44.33±2.35.(2)불동폭광조건하,IQF차이유통계학의의(F=60.35,P＜0.01).결론 수착X선섭영폭광량적증대,현시기도상분변능력축점제고,섭영폭광량위8.0 mAs,영상질량최가,폭광량＞8.0 mAs,현시기대도상세절적현시능력개시하강.
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 monitots 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.