Table 3.
Case | No. of scan points | Registration A (manual) RMS residual (mm) | Registration B (semiautomatic) RMS residual (mm) | RMS difference (A to B) (mm) |
---|---|---|---|---|
2 | 1,600 | 6.5 (24.9) | 6.7 (23.4) | 2.3 (5.2) |
3 | 500 | 5.7 (20.9) | 5.0 (19.4) | 19.5 (35.6) |
4 | 1,500 | 5.0 (14.6) | 4.9 (19.8) | 5.6 (7.7) |
5 | 700 | 6.0 (17.1) | 5.9 (17.1) | 6.5 (10.0) |
6 | 2,400 | 3.0 (20.0) | 3.0 (21.2) | 1.2 (1.9) |
7 | 1,900 | 6.4 (24.8) | 6.4 (26.4) | 2.9 (5.5) |
8 | 2,200 | 6.5 (20.5) | 6.0 (17.9) | 3.7 (5.5) |
Registration A involves manually segmented preoperative surfaces. Registration B uses surfaces from the semiautomatic level-set technique. The second column indicates the number of intraoperative data points (rounded to nearest 1,000). The third and fourth columns provide the root-mean-square (RMS) (and maximum) surface residual for registrations A and B. The final column holds the RMS difference between registrations A and B.