Table 2 List of all coarsening levels, height and width of one image, and the total number of voxels in the corresponding finite element mesh

1

[512 × 512]

7.545.550

2

[256 × 256]

1.930.582

3

[170 × 170]

878.539

4

[128 × 128]

505.844

5

[102 × 102]

331.259

6

[85 × 85]

235.174

7

[73 × 73]

176.488

8

[64 × 64]

138.033