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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