Small Lesions Evaluation Based on Unsupervised Cluster Analysis of Signal-Intensity Time Courses in Dynamic Breast MRI

Table 2

Distribution of the four classes from Figure 1 for different number of clusters, 𝑁=2 to 8, for 20 different runs. Represented are in function of the number of clusters the mean and standard deviation of the clusters to the four Kuhl classes Ia, Ib, II, and III.

Number	Standard deviation				Mean
	Ia	Ib	II	III	Ia	Ib	II	III
2	0	0	0	0	1	0	1	0
3	0	0	0.513	0.513	1	1	0.5	0.5
4	0	0	0	0	1	2	0	1
5	0.366	0.447	0.324	0.224	1.15	1.9	1	0.95
6	0.51	0.51	0.5	0.5	1.55	1.45	1.6	1.4
7	0.224	0.51	0.51	0.224	1.95	1.55	1.55	1.95
8	0.696	0.671	0.6	0	2.2	2.35	1.45	2