Table 2.
Exposure parameter results a for 7 sequences
| Sequence ID | A | B | C | D | E | F | G | p‐value b |
|---|---|---|---|---|---|---|---|---|
| Gradient field exposure parameters | ||||||||
| RMS B (mT) | 2.69 ± 0.02 | 3.83 ± 0.06 | 3.42 ± 0.01 | 4.96 ± 0.00 | 7.85 ± 0.12 | 2.93 ± 0.01 | 3.54 ± 0.02 | 0.003 |
| Maximum B (mT) | 15.8 ± 0.7 | 36.9 ± 1.74 | 9.72 ± 0.03 | 12.9 ± 0.51 | 36.0 ± 1.10 | 12.3 ± 0.74 | 9.73 ± 0.08 | 0.005 |
| B >8 mT (%) | 0.82 ± 0.02 | 4.54 ± 0.24 | 1.54 ± 0.02 | 7.41 ± 0.10 | 19.9 ± 1.21 | 1.68 ± 0.02 | 2.78 ± 0.04 | 0.003 |
| Maximum slope dB/dt (T/s) | 22.3 ± 0.20 | 28.9 ± 0.53 | 32.2 ± 1.56 | 33.2 ± 1.10 | 25.5 ± 0.14 | 24.0 ± 1.62 | 25.3 ± 0.92 | 0.006 |
| Mean slope dB/dt (T/s) | 13.5 ± 0.04 | 17.2 ± 0.01 | 14.5 ± 0.00 | 13.7 ± 0.05 | 11.3 ± 0.02 | 13.2 ± 0.00 | 13.0 ± 0.02 | 0.003 |
| Minimum d to NOM curve | 0.59 ± 0.01 | 0.24 ± 0.12 | 0.26 ± 0.00 | 0.24 ± 0.02 | 0.04 ± 0.03 | 0.38 ± 0.01 | 0.54 ± 0.05 | 0.006 |
| dB/dt >15 T/s (%) | 3.10 ± 0.02 | 6.49 ± 0.01 | 9.56 ± 0.04 | 3.04 ± 0.11 | 0.08 ± 0.00 | 2.59 ± 0.01 | 2.79 ± 0.06 | 0.004 |
| Radiofrequency field exposure parameters | ||||||||
| RMS B1 (μT) | 0.37 ± 0.00 | 0.13 ± 0.00 | 0.11 ± 0.00 | 0.44 ± 0.00 | 0.36 ± 0.00 | 0.11 ± 0.00 | 0.10 ± 0.00 | 0.003 |
| Duty cycle RF (%) | 23.0 ± 0.04 | 1.61 ± 0.00 | 6.78 ± 0.03 | 7.32 ± 0.02 | 23.3 ± 0.04 | 5.41 ± 0.04 | 0.74 ± 0.00 | 0.003 |
| Maximum B1 pulse height (μT) | 2.49 ± 0.02 | 3.44 ± 0.00 | 1.15 ± 0.00 | 3.68 ± 0.00 | 3.57 ± 0.02 | 1.85 ± 0.02 | 4.75 ± 0.07 | 0.003 |
| Mean B1 pulse height (μT) | 1.34 ± 0.01 | 1.12 ± 0.00 | 1.01 ± 0.00 | 3.35 ± 0.01 | 0.93 ± 0.01 | 0.99 ± 0.01 | 3.53 ± 0.05 | 0.003 |
| Maximum B1 pulse width (ms) | 8.62 ± 0.00 | 3.01 ± 0.01 | 2.83 ± 0.01 | 0.44 ± 0.00 | 4.83 ± 0.03 | 16.0 ± 0.00 | 0.64 ± 0.00 | 0.003 |
| RF pulse frequency (per second) | 137 ± 0.11 | 31.9 ± 0.05 | 95.1 ± 0.22 | 202 ± 0.45 | 181 ± 0.11 | 93.4 ± 0.03 | 18.6 ± 0.07 | 0.003 |
| Maximum RMS within a pulse (μT) | 1.51 ± 0.05 | 1.83 ± 0.06 | 0.39 ± 0.00 | 1.68 ± 0.00 | 2.14 ± 0.02 | 0.79 ± 0.01 | 1.22 ± 0.02 | 0.003 |
a
Mean ± standard deviation of gradient‐ and radiofrequency field exposure for three repeated measurements using the fixed set of adjustable settings for seven sequences. Bold numbers indicate which sequence ranked highest on exposure for each exposure parameter.
b
The p‐value gives the probability that there is no significant difference between the sequences according to the non‐parametric Kruskal–Wallis test.