Table 1 The similarity index of different algorithms when applied on 20 real volumes

1_24

0.8678

0.8454

2_4

0.8136

0.7899

5_8

0.8462

0.8076

4_8

0.8091

0.775

6_10

0.8518

0.8091

7_8

0.8613

0.8386

8_4

0.8501

0.8269

11_3

0.8675

0.8471

12_3

0.8498

0.8263

13_3

0.8458

0.8243

15_3

0.8169

0.7691

16_3

0.8256

0.7887

17_3

0.8582

0.811

100_23

0.8649

0.8506

110_3

0.8555

0.8407

111_2

0.8452

0.8095

112_2

0.857

0.8475

191_3

0.8566

0.8322

202_3

0.8555

0.8453

205_3

0.8611

0.8377