Table 4.
RMSE for Ta and Te evaluated using 7 feature sets. The symbol * denotes a spurious registration, where the two images had no alignment. The best registration results, obtained from median and Nakagami m-parameter features are bolded.
| Feature | Attenuation Correction |
Transformation | ||
|---|---|---|---|---|
| Tr | Ta | Te | ||
| Initial Alignment | 5.50 ± 1.49 mm | - | - | |
| Intensity | No | - | 4.86 ± 1.58 mm | 4.52 ± 1.62 mm |
| Yes | - | 4.15 ± 1.06 mm | 3.99 ± 1.09 mm | |
| Mean | No | - | 4.88 ± 2.03 mm | 4.61 ± 2.05 mm |
| Yes | - | 3.73 ± 1.25 mm | 3.54 ± 1.17 mm | |
| Median | No | - | 4.75 ± 1.82 mm | 4.46 ± 1.65 mm |
| Yes | - | 3.79 ± 1.29 mm | 3.32 ± 1.05 mm | |
| Range | No | - | 4.42 ± 1.27 mm | 4.13 ± 1.34 mm |
| Yes | - | 4.60 ± 1.18 mm | 4.25 ± 1.22 mm | |
| Variance | No | - | 4.23 ± 0.98 mm | 3.92 ± 1.06 mm |
| Yes | - | 4.56 ± 1.38 mm | 4.36 ± 1.39 mm | |
| Rayleigh Variance33 |
No | - | 4.54 ± 1.76 mm | 4.30 ± 1.76 mm |
| Yes | - | 3.72 ± 1.16 mm | 3.50 ± 0.90 mm | |
| m-parameter34 | No | - | * | * |
| Yes | - | 3.79 ± 1.15 mm | 3.39 ± 0.85 mm | |