Table 4. Quality of registration results, where the mean error is the distance from the centre of the CT structures to the centre of the MRI structures.
Structure | CT to MRID mean (mm) | CT to MRIRT mean (mm) |
Left femoral head | 3.0±2.2 | 2.0±1.6 |
Right femoral head | 3.4±1.8 | 1.8±1.2 |
Symphysis pubis | 5.2±3.0 | 1.8±1.1 |
Prostate | 5.0±2.5 | 3.6±2.2 |
Prostate and seminal vesicles | 5.2±2.3 | 4.1±2.6 |
MRID, diagnostic MRI scan; MRIRT, MRI scan in the radiotherapy position; SD, standard deviation.