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Abstract #0703

3D Imaging in a Portable MRI Scanner using Rotating Spatial Encoding Magnetic Fields and Transmit Array Spatial Encoding (TRASE)

Clarissa Zimmerman Cooley 1,2 , Jason P Stockmann 1,3 , Mathieu Sarracanie 1,3 , Matthew S Rosen 1,3 , and Lawrence L Wald 1,2

1 A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, 2 Harvard Medical School, Boston, MA, United States, 3 Dept. of Physics, Harvard University, Cambridge, MA, United States

The development of a low-cost portable MRI scanner could facilitate imaging in sites with insufficient space, power, or funding for traditional scanners. To address this need, we previously demonstrated 2D encoding using a rotating, lightweight, inhomogeneous magnet. We now demonstrate the ability to add the missing 3rd direction of encoding using transmit array spatial encoding (TRASE). A TRASE coil consisting of a multi-birdcage coil and a Maxwell coil was designed to fit the geometrical constraints and rotate with the existing magnet to produce proof-of-concepts 3D images. The low-cost, portable scanner architecture is achieved by designing the magnet to only fit around the head, allowing the magnet to be low-field and inhomogeneous, and eliminating the need for gradient coils and gradient power amplifiers through the rotating SEM and TRASE methods.

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