Table 2.

The fibroglandular tissue volume segmented within the breast region obtained by using the proposed template-based algorithms and within the breast region corrected by the radiologist, the % difference, and the inclusion, exclusion, and total % errors.

	Fibrogland	Fibrogland		Inclusion	Exclusion
	vol (cm3)	vol (cm3)	Difference	correction	correction	Total
Cases	algorithm	radiologist	error %	vol (cm3)	vol (cm3)	error %
1	134.4	134.0	0.29%	0.42	0.81	0.92%
2	129.6	128.5	0.90%	1.22	2.38	2.80%
3	94.69	93.53	1.24%	0.47	1.63	2.25%
4	518.0	513.0	0.98%	2.14	7.15	1.81%
5	248.2	246.9	0.55%	0.12	1.48	0.65%
6	104.9	103.4	1.49%	0.62	2.16	2.69%
7	243.7	241.8	0.77%	1.47	3.32	1.98%
8	163.7	162.5	0.70%	0.41	1.54	1.20%
9	41.39	41.24	0.36%	0.47	0.62	2.64%
10	231.0	228.4	1.13%	1.54	4.12	2.48%
11	197.2	196.6	0.32%	0.21	0.84	0.53%
12	97.11	96.24	0.90%	1.54	2.41	4.10%
13	88.03	87.48	0.63%	0.68	1.23	2.18%
14	48.48	48.04	0.92%	1.25	1.69	6.12%
15	49.22	48.01	2.52%	1.02	2.23	6.77%
16	107.2	105.2	1.83%	0.65	2.58	3.07%
17	102.0	101.7	0.31%	1.02	1.34	2.32%
18	108.1	109.1	−0.88%	1.85	0.89	2.51%
19	62.43	61.94	0.79%	0	0.49	0.79%
20	136.5	135.5	0.72%	1.45	2.43	2.86%
21	209.7	207.5	1.09%	2.12	4.39	3.14%
22	148.0	149.0	−0.73%	9.35	8.26	11.8%
23	274.7	274.8	−0.02%	0.25	0.18	0.16%
24	232.5	223.4	4.07%	2.69	11.79	6.48%
25	157.4	157.1	0.20%	0.23	0.54	0.49%
26	151.5	150.7	0.58%	1.43	2.3	2.48%
27	200.0	200.1	−0.05%	0.91	0.81	0.86%
28	360.9	359.4	0.42%	1.39	2.89	1.19%
29	474.5	453.9	4.54%	6.77	27.35	7.52%
30	334.9	332.0	0.87%	1.57	4.45	1.81%
Mean	182	180	1.03%1	1.51	3.48	2.89%
Stdev	118	116	1.03%1	1.93	5.17	2.55%

¹The mean % difference was calculated by considering the absolute values of the % difference from all cases, so the undermeasured and overmeasured cases would not have a cancellation effect.