TABLE IV.
Summary of the absolute accuracy of the deformation map calculated by the MORFEUS deformable image registration method with the contact surface technique integrated. For each deformable gel, accuracy was assessed by comparing the displacements of the three implanted gold seeds estimated by MORFEUS with the seed displacements measured from the sorted 4D CBCT images of that gel. The mean and standard deviation of the absolute vector errors and the absolute errors in the LR, AP, and SI direction are shown, as well as the magnitude of deformation applied to each gel.
| Absolute error (mm) | |||||
|---|---|---|---|---|---|
| Gel (maximum magnitude of motion) | LR | AP | SI | Vector | |
| Conf3 (1 cm) | Mean | 0.3 | 0.6 | 0.7 | 1.1 |
| SD | 0.1 | 0.7 | 0.4 | 0.4 | |
| Conf4 (1.5 cm) | Mean | 0.8 | 0.3 | 0.7 | 1.2 |
| SD | 0.2 | 0.1 | 0.5 | 0.2 | |
| Conf5 (2 cm) | Mean | 0.7 | 0.4 | 0.7 | 1.1 |
| SD | 0.5 | 0.3 | 0.7 | 0.9 | |