评价不同像素矩阵的单色液晶显示器对胸部DR影像识读影响的初步研究

目的评价不同分辨率的医用单色液晶显示器对胸部DR影像识读的影响,探讨放射线科影像诊断显示器的合理购置方案。方法从PACS系统中在线选取胸部DR影像图93幅,其中正常图23幅、疑诊图32幅、确诊图38幅。请低年资、中年资、高年资医师各3名在3种不同分辨率的显示器上集中进行三次独立读图,对结节的有无的评判采用5等分法：肯定有、可能有、不确定、可能无、肯定无,对纹理显示质量的优劣的评判采用3等分法：优、良、差,每名医师针对每台显示器上的每幅图像给出自己的信任等级。采用SPSS13.0对结果进行统计分析。结果对于结节检测而言,高年资医师使用2MP、3MP、5MP显示器的ROC曲线下面积AUC分别为0.774、0.784、0.816,中年资医师分别为0.754、0.764、0.768,低年资医师分别为为0.695、0.754、0.774;在相同分辨率显示器上不同年资的医师之间及同年资医师在不同分辨率的显示器上对肺结节的检出效能比较差异均无统计学意义（P＆gt;0.05）。对于纹理显示质量的评判,除在5MP显示器上高年资和中年资医师、高年资和低年资医师之间存在显著性差异（P＆lt;0.05）外,其他比较差异均无统计学意义。结论在检测肺结节时使用分辨率为2MP、3MP、5MP显示器的诊断效能相当；在观测肺纹理显示质量时在5MP显示器上高年资的医师会得到更多的信息；对于放射科完全可以采用高、中、低分辨率显示器相结合组成诊断工作站系统，不同年资的医师和不同分辨率的显示器之间合理配置可以提高性价比。

Preliminary study on evaluating the influence of monochrome LCDs with different display-pixel matrices for the interpretation of DR chest images

【Objective】 Evaluate the influence of monochrome LCDs with different display-pixel matrices for the interpretation of DR chest images, and approach the allocation scheme of radiodiagnostic displays in the radiology department. 【Methods】93 DR chest images were collected on-line from PACS. These images included 26 normal ones, 29 doubtful ones, and 38 positive ones. Three of high-, midand low-experienced radiologists interpreted the 93 images using three types of displays with different resolutions, respectively. Each observer marked their confidence of the presence of pulmonary nodule with five-point rating scale ： （1）definitely absent, （2）probably absent, （3） possibly present, （4）probably present and （5）definitely present,and the visual quality of lung markings with threepoint rating scale：（1） excellent, （2）fine, （3） inferior. Software SPSS 13.0 was used to analyze the results.【Results】As far as the detection performance of pulmonary nodules is concerned, for high-experienced radiologist the areas under the ROC curves of 2MP, 3MP and 5MP display were 0.774, 0.784, 0.816, respectively; For mid-experienced radiologists those were 0.754, 0.764, 0.768; for low-experienced radiologists those were 0.695, 0.754, 0.774. However there was no significant difference among different types of displays or different aptitudes of radiologists. For the visualization of lung markings, the difference between highand mid-experienced radiologist or between highand low-experienced radiologist on 5MP display was conspicuous （P〈0.05）. But the difference of other comparisons did not reach the significant level. 【Conclusion】It′s equivalent for detection performance of pulmonary nodules with 2MP, 3MP and 5MP medical monochrome LCDs; for the visibility of lung markings, high-experienced radiologists could get more information by using 5MP display; for radiology department, it is advisable to combine the diagnosis workstation system with high-,midand low-resolution monitors, and reasonable equipment scheme between different types of displays and different aptitudes of radiologists could result in better cost-efficacy.