Jason P. Stockmann1,
2, Clarissa Zimmerman3, Matthew S. Rosen, 12,
Lawrence L. Wald1
1Athinoula
A. Martinos Center for Biomedical Imaging, Department of Radiology,
Massachusetts General Hospital, Charlestown, MA, United States; 2Department
of Physics, Harvard University, Cambridge, MA, United States; 3Electrical
Engineering, Massachusetts Institute of Technology, Cambridge, MA, United
States
Recently several encoding strategies have been proposed which use nonlinear spatial encoding magnetic fields (SEMs) to perform projection imaging, exploiting iterative matrix solvers for reconstruction. In the present work, we consider the case of generalized spatial encoding using a rotating multipolar field in the transverse plane, showing how a linear offset field and multiple receive coils can break the symmetry of an arbitrary nonlinear SEM, providing encoding throughout the FOV. This flexible encoding/reconstruction approach relaxes the need for a homogenous B0 field and linear gradient fields, opening the door to new, unconventional MR imaging systems.