Correction and Quantification of Geometric Distortion in MRI

Applications of Computer Vision in Medical Image Processing

Volume

Papers from the 1994 AAAI Spring Symposium

Contents

Magnetic Resonance (MR) images can have significant geometric distortion due to unintended errors in the magnetic fields used in the scanners. We present a new method to quantify the extent of the misregistration used by magnetic field inhomogeneities in MR images to subpixel accuracy. This method does not require an external standard such as Computed Tomography (CT) nor does it require that the geometry of the imaging objects be own a priori. Therefore, it can be used to test the effectiveness of MR spatial distortion correction methods in tise.