摘要目的 探讨应用医用液晶显示器进行软阅读时,影响诊断系统效能的因素及主次关系.方法 从PACS中选取30幅胸部后前位的影像资料.由高、中、低年资放射科医师各3名独立阅片.将影响诊断效能的5个显示因素(观察距离、分辨率、室内照度值、观察视角、负效光角度)各设计4个显示水平(观察距离选取0.3、0.6、0.9、1.2m,显示器分辨率选择1、2、3、5百万像素,室内照度值选取50、100、200、400 lx,观察视角选取0°、15°、30°、45°,负效光角度选取0°、30°、60°、90°).分析误诊次数、诊断时间及无法诊断次数.使用SPSS13.0软件,采用正交实验设计,对统计结果进行极差值分析.结果 各分析指标随显示因素、显示水平的不同,有较大差别.就平均误诊次数而言,因素“观察视角”的极差值最小,为1.4次.因素“负效光角度”的极差值最大,为5.0次.观察距离、显示器分辨率、室内照度值等因素的极差值分别为2.9、2.8、2.5次.结论 对诊断系统效能影响因素的主次顺序为:负效光角度、观察距离、显示器分辨率、室内照度值、观察视角.

abstractsObjective To investigate the effect factors and the relationship of diagnostic system efficiency as soft copy reading with medical LCD.Methods Thirty chest images were selected from PACS on-line.Three of high,mid and low-experienced radiologists interpreted the images on different types of displays independently.Design four display levels based on five factors influencing diagnostic system efficiency,including view distance (0.3 m,0.6 m,0.9 m,1.2 m),monitor resolution ( 1 MP,2 MP,3 MP,5 MP),illuminant level (50 Ix,100 Ix,200 lx,400 lx),view angle (0°,15°,30°,45°) and angle of negative effect light (0°,30°,60°,90°).Three indices of misdiagnosis frequency,diagnosis time and frequency of unable to recognize were analyzed.Orthogonal experimental design and software SPSS 13.0 were used to analyze the results.Results The indices were much different for different factors at different levels.According to the index of average misdiagnosis frequency,extreme difference value of view angle was the lowest (1.4) and angle of negative effect light was the highest (5.0).Extreme difference value of view distance,monitor resolution and illuminant level were 2.9,2.8 and 2.5,respectively.Conclusions The order of different factors influencing diagnostic system efficiency is as follows: angle of negative effect light,view distance,monitor resolution,illuminant level and view angle.