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 | |||