Joseph Yitan Cheng1, Juan M. Santos1, John M. Pauly1
1Department of Electrical Engineering, Stanford University, Stanford, CA, USA
For non-Cartesian scans, the off-resonance distortion greatly degrades the image quality. In this work, two post-gridding correction algorithms are presented: one performed in the frequency domain and the other in the image domain. Both of these computationally fast methods yield noticeable improvements. However, the image domain approach is preferred due to its flexibility in increasing accuracy with little cost. These phase correction algorithms can be applied prior to the correction for B0 inhomogeneities and gradient nonlinearities with accurate results.
Keywords