A new method to collapse the S-transform into local spectra by integrating in squares

Sylvia Drabycz, Thorarin A. Bjarnason, J. Ross Mitchell

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The two-dimensional S-transform (2D-ST) is a promising technique for identifying texture characteristics of brain pathology in magnetic resonance images. Previous work has obtained "texture curves" from the four-dimensional ST domain by integrating the local Fourier domain for each pixel in concentric rings of constant width. Using this approach, previous studies have shown that specific spatial frequency bands can discriminate between active and inactive lesions in multiple sclerosis and between brain tumor genotypes. However, integration in rings produces an artificial drop in spectral power at the Nyquist frequency, potentially masking true high-frequency information. We present a new method of producing texture curves by integrating the ST domain in squares. We compare the two methods on synthetic and clinical multiple sclerosis data and show that our method is simple to implement and produces spectra localized to frequencies below the Nyquist frequency. Integration in squares may produce spectra that are more sensitive to subtle high-frequency changes.

Original languageEnglish (US)
Title of host publication2007 Canadian Conference on Electrical and Computer Engineering, CCECD
Pages741-744
Number of pages4
DOIs
StatePublished - Dec 1 2007
Event2007 Canadian Conference on Electrical and Computer Engineering, CCECD - Vancouver, BC, Canada
Duration: Apr 22 2007Apr 26 2007

Publication series

NameCanadian Conference on Electrical and Computer Engineering
ISSN (Print)0840-7789

Other

Other2007 Canadian Conference on Electrical and Computer Engineering, CCECD
CountryCanada
CityVancouver, BC
Period4/22/074/26/07

Keywords

  • Image processing
  • Local spatial frequency
  • Magnetic resonance imaging
  • S-transform
  • Texture analysis

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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    Drabycz, S., Bjarnason, T. A., & Mitchell, J. R. (2007). A new method to collapse the S-transform into local spectra by integrating in squares. In 2007 Canadian Conference on Electrical and Computer Engineering, CCECD (pp. 741-744). [4232849] (Canadian Conference on Electrical and Computer Engineering). https://doi.org/10.1109/CCECE.2007.190