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. 2014 Jun 17;87(1039):20140017. doi: 10.1259/bjr.20140017

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© 2014 The Authors. Published by the British Institute of Radiology

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Figure 4. — Matching fractions for the human and model observers as a function of prospective threshold radius. Plot (a) is for the abnormal test images, and plot (b) is for the normal test images. F_m between the two human observers is indicated by the solid line in each plot. The other eight curves per plot indicate for the model observers with the background-known-exactly and background-assumed-homogeneous tasks. Based on these plots, the threshold R_m was set to 15 mm.

Inline graphic — Matching fractions for the human and model observers as a function of prospective threshold radius. Plot (a) is for the abnormal test images, and plot (b) is for the normal test images. F_m between the two human observers is indicated by the solid line in each plot. The other eight curves per plot indicate for the model observers with the background-known-exactly and background-assumed-homogeneous tasks. Based on these plots, the threshold R_m was set to 15 mm.