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Abstract #0033

Spatial resolution in rotating Spatial Encoding Magnetic field MRI (rSEM-MRI)

Clarissa Zimmerman Cooley 1,2 , Jason P. Stockmann 1,3 , Brandon D. Armstrong 1,3 , Mathieu Sarracanie 1,3 , Matthew S. Rosen 1,3 , and Lawrence L. Wald 1,4

1 A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, 2 Dept. of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 3 Dept. of Physics, Harvard University, Cambridge, MA, United States, 4 Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, United States

MRI could find wider applicability if lightweight, portable systems were available for siting in unconventional locations. We have proposed a lightweight magnet whose inhomogeneous field pattern is physically rotated to form a rotating Spatial Encoding Magnetic field (rSEM). This is a way to lower the magnet weight and eliminate gradient coils. The resulting image resolution varies spatially in the FOV with minimal encoding in center, a common problem in non-linear gradient encoding schemes. With the goal of improving encoding throughout the FOV, we assess resolution in different rSEMs through simulations, and compare to experimentally acquired images.

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