Distortion in MRI can have a significant impact on diagnosis and radiotherapy treatment planning. We have 3D printed a large, low cost phantom that we used along with a CT ground truth to measure 6 MR scanners geometric accuracy. We found significantly more distortion for the 3T and mobile scanners tested which we conclude means they would require a more careful evaluation of distortion if they are to be used for radiotherapy applications and that care should be taken for all scanners where specialist radiotherapy applications such as stereotactic radiosurgery are used.
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