Abstract #4085

An open source tool for design and construction of Halbach array based low field magnets, passive shims and a robotic field mapper: MRI4ALL

Sai Abitha Srinivas¹, Fernando E Boada², Vito Ciancia³, Clarissa Cooley^4,5, Bernhard Gruber^5,6, Dinank Gupta⁷, Kalina V Jordanova⁸, Aaron R Purchase^4,5, Thiago I Rubio⁹, Jason P Stockmann^4,5, Florin Teleanu ⁹, Chengtong Zhang⁹, and Leeor Alon^10,11

¹Biomedical Engineering, Case Western Reserve University, Cleveland, OH, United States, ²Radiology, Stanford University, Palo Alto, CA, United States, ³LaGuardia Studio, New York University, New York, NY, United States, ⁴Radiology, Massachusetts General Hospital, Boston, MA, United States, ⁵A.A. Martinos Center for Biomedical Imaging, Charlestown, MA, United States, ⁶BARNLabs, Muenzkirchen, Austria, ⁷Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States, ⁸NIST: National Institutes of standards and Technology, Boulder, CO, United States, ⁹Chemistry, New york university, New York, NY, United States, ¹⁰Radiology, Bernard and Irene Schwartz center for Biomedical Imaging, New York University Grossman school of medicine, New York, NY, United States, ¹¹Radiology, Center for Advanced Imaging Innovation and Research (CAI2R), New York University Grossman school of Medicine, New York, NY, United States

Synopsis

Keywords: Low-Field MRI, Low-Field MRI, Open source, magnet design , passive shim, field map

Motivation: A comprehensive open-source toolbox for both design and development of low-field MRI magnets, passive shims and a robotic field mapper can accelerate democratization of low field MRIs.

Goal(s): Develop an open-source tool for optimization and construction of Halbach array magnets and passive shims. Additionally, develop and build open-source field mapper.

Approach: A simple python-based workflow was used for magnet and passive shim design, and an automated CAD model export and ring former development for the optimized geometry.

Results: A 43mT Halbach array was developed with our approach in a week at the MRI4ALL Hackathon. Compact passive shims improved homogeneity in simulation and measurements.

Impact: We have built an easy-to-use open source framework for magnet and passive shim design for low-field MRI with a capability to extract a CAD-file for easy building. Additionally an open source field mapper is developed and is used for validation.

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