Composite MRI scores improve correlation with EDSS in multiple sclerosis

A. H. Poonawalla, S. Datta, V. Juneja, F. Nelson, J. S. Wolinsky, G. Cutter, P. A. Narayana

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Background: Quantitative measures derived from magnetic resonance imaging (MRI) have been widely investigated as non-invasive biomarkers in multiple sclerosis (MS). However, the correlation of single measures with Expanded Disability Status Scale (EDSS) is poor, especially for studies with large population samples. Objective: To explore the correlation of MRI-derived measures with EDSS through composite MRI scores. Methods: Magnetic resonance images of 126 patients with relapsing-remitting MS were segmented into white and gray matter, cerebrospinal fluid, T2-hyperintense lesions, gadolinium contrast-enhancing lesions, T1-hypointense lesions ("black holes": BH). The volumes and average T2 values for each of these tissues and lesions were calculated and converted to a z-score (in units of standard deviation from the mean). These z-scores were combined to construct composite z-scores, and evaluated against individual z-scores for correlation with EDSS. Results: Composite scores including relaxation times of different tissues and/or volumetric measures generally correlated more strongly with EDSS than individual measures. The maximum observed correlation of a composite with EDSS was r = 0.344 (p < 0.0001), which is an improvement over the highest-performing single MRI measure (BH; r = 0.298, p < 0.001). Conclusion: Z-transformation permits construction of composite scores including volumetric and T2-relaxation measures. Inclusion of multiple MRI measures in the composite can provide a broader characterization of the disease process, resulting in more robust correlations with EDSS.

Original languageEnglish (US)
Pages (from-to)1117-1125
Number of pages9
JournalMultiple Sclerosis
Volume16
Issue number9
DOIs
StatePublished - Sep 2010

Keywords

  • Biomarkers
  • EDSS
  • MRI
  • composite score
  • multiple sclerosis

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