Abstract
Objective 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. Key words: Pulmonary nodule; ROC curve; Tomography,X-ray computed; Resolution; Monochrome display adapter
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