Higher-Order Feedback Field Control Improves Linewidths in MR Spectroscopy at 7T

Keywords

according achieved acquisition additional alternatively analog application applied applying averaging bandwidth best biomedical bottle brain breathing built calibrated calibration cause caused channel coil combination concurrently connected constant control controller converter correct corrected correction cortex crucial detection deviations digital diminish discrete dynamic dynamically equivalent establish evolution excitation excursion expected extended fast feedback field fields fluorine frequency general gradient gradients greatly hardware holds homogeneous improved improves improving in vivo induced instability insufficient integral interleaved introduced largely likely limited linear loss measured minor modulation moreover moving nova oscillation outside patent patterns periodically perturbations phantom physiological position press probe probed probes problem proposed pulses quality readjustment real receive recently reflected refocusing regression related relating relies required requires requiring resolution resonant responses retrospectively robustness schematic shim shimming shims similarly solution spectral spectrometer spectroscopy spikes stability stabilization stable static steps subject successively suppression system temporal terms transmit turning twice typical update visible visual voltage voltages volume water widths yielded