Table 3.
Exposure parameter results for different flip angles in sequence A a
| Flip angles | |||||||
|---|---|---|---|---|---|---|---|
| Exposure parameters | 1° | 35° | 70° | 105° | 111° | 147° | Exposure increase (%) |
| B >8 mT (%) | 0.39 | 0.38 | 0.38 | 0.45 | 0.60 | 2.50 | 558 |
| Minimum d to NOM curve | 0.49 | 0.50 | 0.37 | 0.40 | 0.36 | 0.32 | 57 |
| dB/dt >15 T/s (%) | 2.87 | 2.86 | 2.86 | 3.04 | 3.12 | 3.88 | 36 |
| RF duty cycle (%) | 9.75 | 17.8 | 20.7 | 22.2 | 22.5 | 23.5 | 141 |
| Mean RF pulse height (uT) | 1.37 | 0.57 | 0.89 | 1.01 | 1.06 | 1.22 | 139 |
| RF pulse frequency (pulses per second) | 24.1 | 130 | 127 | 156 | 157 | 171 | 609 |
| WB‐SAR estimate b | 0.60 | 0.65 | 0.80 | 1.05 | 1.11 | 1.49 | 148 |
a
Gradient and RF exposure for sequence A performed with different flip angle settings. The exposure increase for each exposure parameter was calculated as 100 * (highest exposure value − lowest exposure value) / lowest exposure value.
b
Whole body SAR (WB‐SAR) as estimated by the scanner based on sequence settings and an operator‐entered fictitious patient weight of 60 kg.