Observer Performance as a function of viewing distance.
The performance of observers in detecting solitary lung nodules of 1.0 and 1.5 cm diameter has been measured for viewing distances of 46, 91, 183, and 470 cm. The data indicate that observer accuracy for detection of 1.5-cm nodules as measured by the area under the  ROC curves is essentially unchanged for the three closest viewing distances and falls of by about 30% at the largest viewing distance. Observer performance for detection of 1.0 cm nodules, however, improves as the viewing distance is increased from 46 to 91 cm and then decreases at larger viewing distances.
D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging*; D011859:Radiography; D003074:Solitary Pulmonary Nodule / Q000000981:diagnostic imaging*; D013679:Technology, Radiologic