Table 7.
Evaluation of the alignment using five manually placed landmarks. The landmarks were place twice in US images and the last row shows the intra-rater error. The mTRE is calculated over the five landmarks for each of the tested methods. In the last two columns we present p-values showing the statistical significance when compared to the manual rater and the proposed method, respectively.
| Registration | Similarity | Source | mTRE (mm) | p-value with intra-rater | p-value with proposed |
|---|---|---|---|---|---|
| No alignment | 7.49 | 6 × 10−4 | 6 × 10−4 | ||
| Gradient descent | NCC | Pseudo US | 3.18 | 0.03 | 0.03 |
| Gradient descent | LNCC | Pseudo US | 4.73 | 0.02 | 0.03 |
| Block-matching | CR | MRI | 2.83 | 0.03 | 0.15 |
| Block-matching | NCC | Pseudo US | 2.52 | 0.81 | |
| Intra-rater error | 2.14 | 0.81 |