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Abstract #1049

Improved uniformity of the spatial PSF for portable MRI using an optimized rotating magnet

Clarissa Zimmerman Cooley1,2, Jason P Stockmann1,2, Patrick C. McDaniel3, Charlotte Sappo1, Christopher Ha1, Christopher E. Vaughn1, Matthew S. Rosen1,2, Thomas Witzel1,2, and Lawrence L. Wald1,2

1A.A. Martinos Center for Biomedical Imaging, Massachusettts General Hospital, Charlestown, MA, United States, 2Harvard Medical School, Boston, MA, United States, 3EECS, Massachusetts Institute of Technology, Cambridge, MA, United States

The development of a low-cost portable MRI scanner for brain imaging could facilitate imaging in new sites with insufficient space, power, or funding for traditional scanners. To address this need, we previously established a 3D encoding method using a rotating inhomogeneous B0 field and RF phase gradients, but uncontrolled field patterns showed encoding problems near the object center. Here we show this problem can be fixed in an optimized 122 kg head-sized permanent magnet with a built-in approximately linear encoding field in 2D images with improved resolution homogeneity across the field of view.

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