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Abstract #3556

Portable Magnet Design Optimization for Brain Imaging without Gradient Coils

Clarissa Zimmerman Cooley1, Melissa Haskell1,2, Jason P Stockmann1, Cristen Lapierre1, Chenoa Schatzki-McClain1, Charlotte Sappo1, Stephen F Cauley1,3, Bastien Guerin1,3, Matthew S Rosen1,3,4, and Lawrence L Wald1,3,5

1A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 2Biophysics, Harvard University, Cambridge, MA, United States, 3Harvard Medical School, Boston, MA, United States, 4Department of Physics, Harvard University, Cambridge, MA, United States, 5Harvard-MIT Division of Health Sciences Technology, Cambridge, MA, United States

The development of a low-cost portable MRI scanner for brain imaging could address the need for imaging at unconventional sites. We previously presented an appropriate method for 3D imaging in a portable magnet without gradient coils. In-plane image encoding was demonstrated using the natural field variation of a rotating prototype magnet. However, the magnet diameter must be increased for human brain imaging and the built-in encoding field should be tailored to improve image resolution uniformity. We present a method for designing an optimized magnet for this application using the Genetic Algorithm, and evaluate a chosen design via image simulations.

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