Correction of the non-uniformity field in MR images
Yin Li · 2002
Magnetic resonance images are always corrupted by a slow varying field known as the non uniformity field.The non uniformity modifies the local statistical characteristics of tissues to cause the distribution of signal intensities associated with these tissues to overlap significantly.It makes the intensity based segmentation in MR images far more difficult than in any other medical images.So it is the major obstacle of automatic segmentation in MR images.Many correction approaches have been proposed,including the conventional image processing methods such as image blurring,smoothing,filtering and relatively new segmentation based method and histogram based method.This paper summarizes and discusses these correting methods.