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Summary 2
• Characterizing geometrical distortions can be done with a phantom
– Avoid inducing additional susceptibility artifacts
– Distortions depend on specific sequence
• Geometrical accuracy tends to deteriorate towards the body contour
and tends to be good in the center of the body
– Localization of external markers may be inaccurate
• Many possibilities exist to avoid artifacts or to minimize their impact.
It is important to be aware of possible artifacts