Table 1 Range of geometric distortion ratio and SNR for T1W sequence
From: Signal-to-noise ratio evaluation of magnetic resonance images in the presence of an ultrasonic motor
TH (mm) | BW | Distance from motor (mm) | ||
|---|---|---|---|---|
Minimum | Maximum | Minimum | Maximum | |
5 | 4–0.7% (SNR: 186–259) | 2.3–0.9% (SNR: 150–232) | 37 | 67 |
3 | 5.5–1.7% (SNR: 132–154) | 2.9–1.1% (SNR: 92–112) | 34 | 58 |
1 | 3.7–1.7% (SNR: 13–23) | 2.9–1.5% (SNR: 11–21) | 28 | 44 |