Derivation of SOM-like rules for intensity inhomogeneity correction in MRI

  • Authors:
  • Maite García-Sebastián;Ana I. Gonzalez;Manuel Graña

  • Affiliations:
  • Computational Intelligence Group, Dept., CCIA, San Sebastian, Spain;Computational Intelligence Group, Dept., CCIA, San Sebastian, Spain;Computational Intelligence Group, Dept., CCIA, San Sebastian, Spain

  • Venue:
  • IWANN'07 Proceedings of the 9th international work conference on Artificial neural networks
  • Year:
  • 2007

Quantified Score

Hi-index 0.00

Visualization

Abstract

Given an appropriate imaging resolution, a common Magnetic Resonance Imaging (MRI) model assumes that the object under study is composed of piecewise constant materials, so that MRI produces piecewise constant images. The intensity inhomogeneity (IIH), due to the spatial inhomogeneity in the excitatory Radio Frequency (RF) signal and other effects, is modeled by a multiplicative inhomogeneity field. We propose and test two estimation rules of the IIH field, inspired in the Self Organizing Map (SOM), derived from well defined energy functions.