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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