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Fig. 2A —Transverse CT images with target field of view show solid nodules
(green circles) only detected by computer-aided detection (CAD)
system. Small (< 4 mm) central nodule (A), moderate (4 mm 
diameter 10 mm) peripheral nodule (B), and moderate (4 mm
diameter 10 mm) nodule at hilum (C) were surrounded by
similar-sized vessels, which make them difficult for radiologist to
distinguish on 2D image.
