We use a Lego phantom[0] to control for geometric distortions in a few of our MRI studies. The tolerances are so tight that it works really well. Especially imp

We use a Lego phantom[0] to control for geometric distortions in a few of our MRI studies. The tolerances are so tight that it works really well. Especially important in multi-site studies. [0] https://en.wikipedia.org/wiki/Imaging_phantom https://en.wikipedia.org/wiki/Imaging_phantom