Abstract #3556

Portable Magnet Design Optimization for Brain Imaging without Gradient Coils

Clarissa Zimmerman Cooley¹, Melissa Haskell^1,2, Jason P Stockmann¹, Cristen Lapierre¹, Chenoa Schatzki-McClain¹, Charlotte Sappo¹, Stephen F Cauley^1,3, Bastien Guerin^1,3, Matthew S Rosen^1,3,4, and Lawrence L Wald^1,3,5

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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