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Abstract #4982

An open-source shim generation workflow for permanent magnet MRI systems

Stephen E. Ogier1, Greg Shakar2, Rodney Rojas3, Sanli Faez and the Utrecht OSII Team 4, Thomas O'Reilly5, Kathryn E. Keenan1, and Joshua Harper3
1National Institute of Standards and Technology, Boulder, CO, United States, 2Interactive Telecommunications Program, NYU, New York, NY, United States, 3Universidad Paraguayo Alemana, Asunción, Paraguay, 4Utrecht University, Utrecht, Netherlands, 5Leiden University Medical Center, Leiden, Netherlands

Synopsis

Keywords: Low-Field MRI, Shims

Motivation: One of the most challenging steps in constructing a low-field MRI scanner is shimming. At the present time, there are no general-purpose low-field shim generation tools.

Goal(s): To develop a workflow to generate permanent magnet shims for low-field scanners.

Approach: A modular, python-based workflow has been developed that can produce a set of CAD files for a shim design from a B0 map of the magnet to be shimmed and a CAD template file.

Results: Two sites tested the shim generation part of the workflow, and one site was able to construct and measure the generated shim design.

Impact: An open-source workflow was developed to streamline the design of permanent magnet shims for low-field permanent magnet scanners. This will make shimming, one of the most challenging parts of permanent magnet construction, easier and more accessible.

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