Fractal dimension and white matter changes in multiple sclerosis

Francisco J. Esteban, Jorge Sepulcre, Nieves Vélez de Mendizábal, Joaquín Goñi, Juan Navas, Juan Ruiz de Miras, Bartolome Bejarano, Jose C. Masdeu, Pablo Villoslada

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

The brain white matter (WM) in multiple sclerosis (MS) suffers visible and non-visible (normal-appearing WM (NAWM)) changes in conventional magnetic resonance (MR) images. The fractal dimension (FD) is a quantitative parameter that characterizes the morphometric variability of a complex object. Our aim was to assess the usefulness of FD analysis in the measurement of WM abnormalities in conventional MR images in patients with MS, particularly to detect NAWM changes. First, we took on a voxel-based morphometry approach optimized for MS to obtain the segmented brain. Then, the FD of the whole grey-white matter interface (WM border) and skeletonized WM was calculated in patients with MS and healthy controls. To assess the FD of the NAWM, we focused our analysis on single sections without lesions at the centrum semiovale level. We found that patients with MS had a significant decrease in the FD of the entire brain WM compared with healthy controls. Such a decrease of the FD was detected not only on MR image sections with MS lesions but also on single sections with NAWM. Taken together, the results showed that FD identifies changes in the brain of patients with MS, including in NAWM, even at an early phase of the disease. Thus, FD might become a useful marker of diffuse damage of the central nervous system in MS.

Original languageEnglish (US)
Pages (from-to)543-549
Number of pages7
JournalNeuroImage
Volume36
Issue number3
DOIs
StatePublished - Jul 1 2007

Keywords

  • Fractal dimension
  • Image analysis
  • Magnetic resonance imaging
  • Multiple sclerosis
  • Normal appearing white matter

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Neurology

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