Table 3.

Overlap scores of 23 CT images obtained using the improved random walker and the conventional random walk. See the text for more details.

ID	The number of seeds	The improved RW	RW with our seeds	RW without our seeds	Times
1	276	0.9193	0.7727	0.7452	1.2500
2	235	0.8903	0.9291	0.8434	1.2650
3	297	0.9203	0.8024	0.7634	1.2521
4	349	0.8231	0.7054	0.6901	1.3190
5	216	0.9321	0.9193	0.9025	1.4760
6	197	0.8929	0.7544	0.7146	1.3440
7	302	0.8340	0.7053	0.7568	1.3280
8	189	0.8853	0.7619	0.7023	1.6310
9	243	0.8727	0.8820	0.7823	1.3440
10	379	0.9341	0.8319	0.8726	1.3260
11	197	0.8290	0.8920	0.8340	1.6950
12	264	0.8631	0.8631	0.7920	1.2810
13	375	0.8498	0.8012	0.7034	1.3520
14	294	0.8920	0.8290	0.8401	1.2970
15	176	0.9352	0.8031	0.7432	1.4230
16	276	0.8860	0.8460	0.6931	1.4690
17	307	0.7964	0.7254	0.7350	1.3130
18	238	0.9453	0.8015	0.7031	1.4220
19	398	0.8624	0.8106	0.8326	1.2190
20	289	0.9540	0.8342	0.7920	1.2820
21	208	0.7786	0.7326	0.7021	1.3550
22	178	0.7695	0.7690	0.7431	1.3130
23	267	0.8442	0.6524	0.6014	1.2340
Mean std.		0.8743	0.8011	0.7604	1.3561
		0.0529	0.0708	0.0710	0.1165