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Abstract #3197

Rotating Magnet Arrays as Spatial Encodings for Portable MRI Applications

Yaokun Shi1, Nina Ayar1, Kwan-Jin Jung2, and Kiruba Sivasubramaniam Haran1
1Electrical and Computer Engineering, University of Illinois Urbana-Champaign, Champaign, IL, United States, 2Biomedical Imaging Center, Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Champaign, IL, United States

Synopsis

Keywords: New Trajectories & Spatial Encoding Methods, New Trajectories & Spatial Encoding Methods, Portable MRI, Gradient-free MRI

Motivation: Traditional MRIs are inaccessible in point-of-care scenarios or rural areas; portable MRI devices are proposed but remain inflexible and costly.

Goal(s): Prototype a miniature MRI device suitable for various use cases.

Approach: Three rotating permanent magnet arrays create unique field map patterns at discrete time steps, providing the base magnetic field and spatially encoding the information. A series of excitation frequencies allow volumetric “slice” selection, where signals are back-projected and overlaid to create the image.

Results: Preliminary results from the prototype prove the feasibility of our approach. Simulated results further demonstrate the prototype’s capability of 2D imaging at the cost of image quality.

Impact: The preliminary prototype embraces inhomogeneity in the base magnetic field, eliciting a new direction for MRI instrumentation. Its ability to produce pilot scans allows for early diagnosis while reducing costs and providing patient comfort, ultimately making MRI technology more accessible.

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Keywords