Abstract #0486

A Single-Sided 50mT, 7kg “Helmet” Magnet for Continuous Brain Monitoring in Acute-Care Setting

Susanna Chen^1,2, Sarah Altman^2,3, Jason P Stockmann^2,4, Clarissa Z Cooley^2,4, and Lawrence L Wald^2,4,5

¹Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, ²Department of Radiology, Athinoula A Martinos Center for Biomedical Imaging, Charlestown, MA, United States, ³Harvard-MIT Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, United States, ⁴Harvard Medical School, Boston, MA, United States, ⁵Division of Health Sciences and Technology, Harvard-Massachusetts Institute of Technology,, Cambridge, MA, United States

Synopsis

Keywords: Low-Field MRI, Brain

Motivation: Conventional MRI systems and portable low-field scanners are too large, costly, and difficult to site, making them unsuitable for continuous monitoring in acute-care settings.

Goal(s): Develop a single-sided, helmet-shaped MRI device capable of imaging brain region 5cm from the top of the head, with dimensions of 80 mm x 80 mm x 26.5 mm.

Approach: Optimize and build a magnet array with a mean |B0| greater than 50 mT and a built-in gradient usable for readout or slice selection.

Results: A single-sided magnet array, weighing <10 kg, was built and bench-tested, achieving a mean |B0| of 50 mT and a 50 mT/m gradient.

Impact: We present a portable, single-sided 50mT B0 magnet with improved field coverage and a built-in 50mT/m gradient for readout, advancing the development of an MRI system capable of continuous brain imaging in acute-care settings.

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