Real-Time Shim Feedback for Field Stabilization in Human MRI Systems

Keywords

accurately achieve achieved addressing allow alone amplifier analog analogy applied applying arbitrary artifacts automatically back bandwidth bank belt best biomedical bore bottle breathing bulk capability choosing coil coils compensated compensation conservative constant control controller converter coordinate correct correction cost dashed decay degrade described desired determined deuterium deviation digital direct discrete drift drifts equipped even experiment experimental external extracted feedback fidelity field fields filtered fluctuations gain gradient hardware heuristically independent indicated induced initial integral intensive irreversible iteration kept known leaving linear loop loss magnet measured measuring methodology minimize minutes motion moving next observations octahedral output parameterized particularly person perturbations physiological placed position presence probe probes problem produced readings readjust real reduce refining related relatively reports required respiratory response retrieve room sample scanner schematic separate setting setup shim slow smooth software solid sources spatial spherical spontaneous stability stabilization stabilize stemming steps strength system systems temperature thereby thick thin update voltage water whole whose