Table 2.
Experimentally measured SAR (mean ± SD) using four optical E-field sensors at Siemens 3 T and two of same model Philips 3 T systems the average of the local SAR measurements with and without artificial hip joints at all locations from the head to the tail of the implants.
| Image sequence | Siemens 3 T | Philips 3Ta | Philips 3 Tb | ||||||
|---|---|---|---|---|---|---|---|---|---|
| T1w TSE | T1 TIRM | T2w TSE | T1w TSE | T1w SPIR | T2w TSE | T1w TSE | T1w SPIR | T2w TSE | |
| Averaged local SAR with (without) implant (W/kg) | 12.09 (4.19) | 13.92 (4.19) | 11.73 (4.19) | 13.61 (4.07) | 12.41 (4.07) | 11.93 (4.07) | 13.45 (4.24) | 11.94 (4.24) | 11.89 (4.24) |
| SAR at OEFS #1 | 18.32 ± 1.47 | 19.14 ± 1.35 | 16.77 ± 1.34 | 19.02 ± 1.45 | 18.51 ± 1.38 | 23.35 ± 1.78 | 18.16 ± 1.45 | 19.37 ± 1.45 | 16.38 ± 1.21 |
| SAR at OEFS #2 | 19.86 ± 1.79 | 19.64 ± 1.47 | 20.57 ± 1.85 | 25.03 ± 2.15 | 18.39 ± 1.56 | 14.68 ± 1.23 | 22.3 ± 1.98 | 16.68 ± 1.41 | 12.65 ± 1.04 |
| SAR at OEFS #3 | 21.51 ± 1.84 | 22.74 ± 2.01 | 23.46 ± 2.11 | 28.8 ± 2.39 | 13.53 ± 1.12 | 18.93 ± 1.61 | 27.6 ± 2.28 | 13.74 ± 1.14 | 20.3 ± 1.73 |
| SAR at OEFS #4 | 27.68 ± 2.16 | 28.4 ± 2.17 | 25.42 ± 2.03 | 17.43 ± 1.29 | 13.18 ± 1.05 | 15.57 ± 1.15 | 19.32 ± 1.45 | 14.35 ± 1.02 | 13.82 ± 0.99 |
a, b = two same model Philips 3 T MRI systems, SD = standard deviation, TIRM = turbo inversion recovery magnitude, SPIR = spectral pre-saturation with inversion recovery, TSE = Turbo spin echo.