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Fig. 1D. —Radiologists' average ratings without and with computer
output for six cases used in observer study. Note that difference in
likelihood of malignancy between computer output and initial radiologists'
ratings was not large in cases shown here. Radiologists' interpretation with
computer-aided diagnosis (CAD) scheme was, in general, more accurate than
radiologists without CAD scheme in most malignant and benign nodules. HRCT
scan of 79-year-old man with benign nodule shows mixed ground-glass opacity.
Computer output was 0.57; radiologists' ratings without CAD, 0.48; and
radiologists' ratings with CAD, 0.56.
