Abstract
To measure and correct the spatial distortion in magnetic resonance imaging. Depending on the individual magnetic resonance (MR) system, inhomogeneities and nonlinearities induced by eddy currents during the pulse sequence can distort the images and produce spurious displacements of the stereotactic coordinates in both the x–y plane and the z axis. If necessary, these errors in position can be assessed by means of two phantoms placed within the stereotactic guidance system – a 2D phantom displaying “pincushion” distortion in the image, and a 3D phantom displaying displacement, warp and tilt of the image plane itself. The pincushion distortion can be “corrected” by calculations based on modelling the distortion as a fourth-order 2D polynomial.
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