TABLE 2.
Comparison Between Clinically Approved 7-T Scanner Systems
| Manufacturer | Siemens | GE |
|---|---|---|
| Name | Magnetom Terra | Signa |
| B0, T | 7 | 7 |
| Magnet weight with cryogens | Approximately 17,000 kg | Approximately 45,000 kg |
| Typical B0 homogeneity 40 cm DSV | ≈2 ppm peak to peak | ≈3 ppm peak to peak |
| Helium boil of rate | Zero boil off | Zero boil off |
| Fringe field (axial × radial), m | 7.9 × 4.95 | 8.0 × 4.4 at 5 gauss |
| Patient bore (length × width × height), cm | 270 (magnet) × 60 × 60 | 330 × 60 × 60 |
| Patient aperture, cm | 60 | 60 |
| Gradient: peak amplitude, per axis, mT/m | 80 | 113 |
| Gradient: peak slew-rate, per axis, T/m/s | 200 | 260 |
| Multinuclear imaging | Yes | Yes |
GE, General Electrics.