Table 2.
Stability and robustness of measurements after registration and interpolation were assessed using three test images of the same subject. The measurements were similar across tests, with similar variability across space and high spatial correlation.
| Test A | Test B | Test C | |
|---|---|---|---|
| Manufacturer and model | Siemens MAGNETOM Trio 3 T | Siemens MAGNETOM Trio/TIM 3 T | Siemens MAGNETOM Allegra 3 T |
| Sequence | MPRAGE | MPRAGE | MPRAGE |
| TE/TI/TR (ms) | 3.04/785/2100 | 2.83/766/2200 | 2.74/900/2500 |
| Flip angle | 13° | 13° | 8° |
| Voxel size (mm) | 0.8×0.8×0.8 | 0.8×0.8×0.8 | 1.0×1.0×1.0 |
| Number of acquisitions | 14 | 7 | 1 |
| Scan date | March 2008 | March 2008 | April 2009 |
| Cortical surface area (mm2) | 176,996 | 177,098 | 180,949 |
|
| |||
| Not smoothed | |||
| Average area per face (mm2) | 0.2937 | 0.2939 | 0.3003 |
| Standard deviation | 0.0938 | 0.0910 | 0.0962 |
| Correlation with Test A | – | 0.8218 | 0.7589 |
| Correlation with Test B | 0.8218 | – | 0.7863 |
| Correlation with Test C | 0.7589 | 0.7863 | – |
|
| |||
| Smoothed (FWHM = 10 mm) | |||
| Average area per face (mm2) | 0.2935 | 0.2936 | 0.3000 |
| Standard deviation | 0.0746 | 0.0712 | 0.0748 |
| Correlation with Test A | – | 0.9509 | 0.9074 |
| Correlation with Test B | 0.9509 | – | 0.9353 |
| Correlation with Test C | 0.9047 | 0.9353 | – |