Consistent non-Cartesian off axis image quality: Removing multiple sources of demodulation phase errors
Jashnani Y, Block W, Kijowski R, Jung Y
University of Wisconsin-Madison, University of Wisconsin-Madison
Off axis imaging using non-Cartesian sequences suffers degradation relative to on axis imaging if an accurate demodulation reference signal is not available. Poorly generated reference signals necessitate hand tuning of a system delay parameter. Removing phase errors due to these timing offsets only partially restores image quality. Deviations in k-space sample locations due to eddy currents and gradient anisotropic delays result in demodulation phase errors, which must be compensated to fully restore image quality. Off axis image quality has been significantly improved by correcting for all sources of demodulation phase errors and k-space location errors during image reconstruction.