摘要目的 评价不同分辨率的单色液晶显示器对肺结节检出效能的影响.方法 从数据库中在线选取胸部数字化放射成像(DR)影像图93幅:确诊图38幅、疑诊图32幅、正常图23幅(均由CT证实).将阳性病例按结节直径大小分为A、B两组,高、中、低年资医师各3名在3种不同分辨率的显示器上集中进行3次独立读图,对结节有无的评判采用5等分法:肯定有、可能有、不确定、可能无、肯定无,每名医师针对特定显示器上的每幅图像给出自己的信任等级.采用SPSS 13.0对结果进行统计分析.结果 高年资医师使用2 MP、3 MP、5 MP显示器识读A组结节时受试者操作特性(ROC)曲线下面积分别为0.643、0.686、0.739;中年资为0.636、0.682、0.717;低年资为0.623、0.656、0.721.识读B组结节时高年资医师为0.813、0.832、0.846;中年资为0.773、0.824、0.838;低年资为0.763、0.773、0.833.不同放射系统诊断效能比较差异无统计学意义(P＞0.05).结论 在不限制图像后处理工具的情况下,不同年资的医师在不同分辨率的显示器上识读A、B两组不同尺寸结节时诊断效能差异无统计学意义.

abstractsObjective To evaluate the impacts of monochrome liquid crystal display (LCD) with different resolutions on detection performance of pulmonary nodules. Methods Ninety- three digital radiography (DR) chest images, selected on-line from database including 38 confirmed cases, 32 suspected cases and 23 normal cases (all confirmed by CT) , were divided into groups A and B according to the diameter of nodules. Each three of radiologists with senior, intermediate and junior professional titles were invited to interprete independently for 3 times the 93 images using three types of display adapters with different resolutions. Regarding the presence of nodule, five-point confidence level rating scale was used:definite absence, probable absence, indetermination, probable presence and definite presence. All the observers marked their confidence levels of every image on the given display adapters according to the presence of pulmonary nodules. Software SPSS 13.0 was used for statistical analysis of the results. Results The area under the curve (AUC) of receiver operating characteristic (ROC) for detection of pulmonary nodules in Group A on 2 MP, 3 MP and 5 MP display adapters were 0.643, 0.686 and 0.739 by senior radiologists, 0.636, 0.682 and 0.717 by intermediate-titled radiologists, and 0.623, 0.656 and 0.721 for junior radiologists respectively. These figures for Group B were 0.813, 0.832 and 0.846 by senior radiologists, 0.773, 0.824 and 0.838 by intermediate-titled radiologists, and 0.763, 0.773 and 0.833 by junior radiologists respectively. There was no significant difference in the nodular detection performance among different radiodiagnostic systems. Conclusion With no constraints on post-processing tools, there is no significant difference of detection performance on pulmonary nodules in A or B Group displayed on medical monochrome LCDs with different resolutions intepreted by radiologists with different professional titles.