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Table 3 Compensation method impacts

From: Signal-to-noise ratio evaluation of magnetic resonance images in the presence of an ultrasonic motor

Sequence TH (mm) Artifact size impact BW impact on geometric distortion Acquisition duration (min)
SNR and distance Artifact size (%) Distance range (mm) for present artifact SNR and distance Min/max BW Distance range for geometric distortion
Min BW Max BW
Max Min Max dist (%) Min dist (%) Max dist (%) Min dist (%)
T1W 3   26.4% 2.1%    5.5% 1.7% 2.9% 1.1%   3:15
SNR 50 100 SNR 132 154 92 112
Distance from motor (mm) 26 38 12 Distance from motor (mm) 34 58 34 58 24
T2W 3   31.6% 4.8%    5.2% 1.8% 2.3% 0.9%   1:39
SNR 37 77 SNR 110 122 68 85
Distance from motor (mm) 26 40 14 Distance from motor (mm) 34 46 34 46 12
TSE 3   31.4% 6.7%    4.3% 1.7% 2% 1.4%   3:12
SNR 7 14 SNR 9 18 10 20
Distance from motor (mm) 26 35 9 Distance from motor (mm) 31 49 31 49 18
FFE 3   39.3% 13.5%    3.1% 2% 1.5% 1.2%   1:33
SNR 4 6 SNR 8 19 4 9
Distance from motor (mm) 27 40 13 Distance from motor (mm) 26 48 26 48 22