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Gradients
•
Eddy currents degrade
imaging
pre-emphasis
(compensation)
Active shielding
•
Manufacturer
Field
Strength
(T)
SPL
(dB(A))
Philips
1.5
112
Siemens
1.5
106
GE
1.5
110
Varian
3.0
118
Bruker
3.0
113
Lorentz force causes
vibrations
Noise & reduction methods
seCond
thuMb
First
Field
Motion
Current