Table 4.

The detection rate and FPs per case for mass detection based on combined feature selection

	All cases		Benign cases		Malignant cases
	Detection rate	FPs per case	Detection rate	FPs per case	Detection rate	FPs per case
Th = 0.0	100.00 %	43.74	100.00 %	46.27	100.00 %	43.30
Th = 0.1	100.00 %	15.15	100.00 %	16.27	100.00 %	15.27
Th = 0.2	96.72 %	10.41	90.48 %	11.00	100.00 %	10.57
Th = 0.3	91.80 %	8.00	76.19 %	8.60	100.00 %	8.07
Th = 0.4	91.80 %	6.18	76.19 %	6.80	100.00 %	6.10
Th = 0.5	91.80 %	4.56	76.19 %	4.80	100.00 %	4.43
Th = 0.6	81.97 %	3.53	52.38 %	3.67	97.50 %	3.43
Th = 0.7	78.69 %	2.68	42.86 %	3.00	97.50 %	2.67
Th = 0.8	73.77 %	1.88	33.33 %	2.13	95.00 %	1.90
Th = 0.9	62.30 %	1.12	19.05 %	1.20	85.00 %	1.20
Th = 1.0	0.00 %	0.00	0.00 %	0.00	0.00 %	0.00

If the likelihood of detected candidates estimated by the combined features is larger than the logistic regression threshold value, Th, it is selected as a mass. If a case included benign and malignant masses, the case is considered as both benign and malignant case. There are 15 benign cases and 30 malignant cases