Nicolas Arango1, Molin Zhang1, Jason Stockmann2,3, Jacob White1, and Elfar Adalsteinsson1,4
1Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 2A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 3Harvard Medical School, Boston, MA, United States, 4Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, United States
1Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 2A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 3Harvard Medical School, Boston, MA, United States, 4Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, United States
We demonstrate simulations of a new method for ∆B0 selective excitation for rFOV imaging by only deselecting signal that would otherwise alias into the target FOV.
Figure 1. Excited volume from one-sided zoomed imaging excitation and optimized b) ΔB0 field. The Hyperboloid excitation volume does not take advantage of the don't care regions introduced by the alias deselection mask.
Figure 3. Sagital slice of excitation (a,b,c) and rFOV aliasing pattern (d,e,f) from Linear gradient optimized and linear gradients plus multicoil shim optimized rFOV excitation. (a,d) Linear gradients can select an off-axis slab between aliases with a sufficiency large rFOV. (b,e) Tighter rFOVs cannot be achieved with linear gradients only.(c,f) Multicoil shim array in conjunction with linear gradients achieves tighter rFOV.