Table 2.

A summary of the values for the model observers

Task	Observer	Abnormal	Normal	Overall
BKE-Ω	Scan	0.75 ± 0.02	0.34 ± 0.03	0.54 ± 0.02
	VS	0.82 ± 0.02	0.46 ± 0.03	0.64 ± 0.02
BKE-	Scan	0.81 ± 0.02	0.44 ± 0.03	0.62 ± 0.02
	VS	0.83 ± 0.02	0.50 ± 0.03	0.66 ± 0.02
BAH-Ω	Scan	0.29 ± 0.02	0.07 ± 0.01	0.18 ± 0.02
	VS	0.57 ± 0.03	0.21 ± 0.02	0.39 ± 0.02
BAH-	Scan	0.70 ± 0.02	0.22 ± 0.02	0.46 ± 0.02
	VS	0.71 ± 0.02	0.28 ± 0.02	0.50 ± 0.02

BAH, background-assumed-homogeneous; BKE, background-known-exactly; VS, visual search.