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Abstract:
The number of low-field MRI scanners is on the rise, mostly due to the low costs and open-source design. Typically, the magnets are based on permanent magnets in Halbach configuration, which show strong manufacturing tolerances. Passive shimming is therefore required. Here, we present a compact and cheap measurement system based on a simple robot arm with 5 degrees of freedom and a self-developed Hall sensor. The functionality of the system is demonstrated by mapping a Halbach magnet with a magnetic field strength of 45mT (length magnet 300mm, diameter of the inner bore 160mm).
