Reduction of pulsed gradient settling time in the superconducting magnet of a magnetic resonance instrument.
The implementation of electronic compensation for eddy currents to reduce the gradient settling times on a superconducting magnet is described. Field plots inside the magnet indicate the importance of assessing the field changes at several positions in the magnet. The effect of an asymmetry between the gradient coil system and the cryostat is demonstrated. A modified compensation circuit is described to overcome this mechanical asymmetry.
Jensen
D J
DJ
Department of Radiology, University of Texas Medical School, Houston 77030.
Brey
W W
WW
Delayre
J L
JL
Narayana
P A
PA
D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation; D008280:Magnetics