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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