Gradient hysteresis in MRI and NMR experiments.
In this paper, we describe a gradient hysteresis effect that can modulate the current in gradient coils during MRI and NMR experiments. A simple pulse sequence is presented for the purpose of evaluating the resulting changes in the accumulated phase. Additionally, the nature of the gradient pulse shape changes is described. These experiments will be of interest to MRI and NMR scientists who are developing pulse sequences requiring precision gradient performance or who are currently seeking the source of unexplained NMR artifacts.
Nieman
Brian J
BJ
Mouse Imaging Centre, Hospital for Sick Children, Toronto, Ont., Canada. brian.nieman@sw.ca
Bishop
Jonathan
J
Henkelman
R Mark
RM
D000818:Animals; D016477:Artifacts; D001931:Brain Mapping / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D051379:Mice