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MRI distortion correction for functional
radiosurgery procedures can be performed using a precision-machined cubic
phantom and an appropriate mathematical model of the relationship between
distorted and undistorted coordinates.
 S. Langlois, M. Desvignes, J.M. Constans, and M. Revenu, “MRI geometric
distortion: a simple approach to correcting the effects of non-linear gradient
fields,” J. Magn. Reson. Imaging, 9,
pp. 821-831, 1999.