A magnetization transfer histogram study of normal-appearing brain tissue in MS

C. Tortorella, B. Viti, M. Bozzali, M. P. Sormani, G. Rizzo, M. F. Gilardi, G. Comi, Massimo Filippi

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: To evaluate 1) the ability of magnetization transfer ratio (MTR) histogram analysis to detect the extent of changes occurring outside MS lesions seen on conventional scans, 2) whether such changes vary in the different MS clinical phenotypes, 3) whether the changes are associated with the extent and severity of the macroscopic lesion load, and 4) the contribution to brain atrophy. Methods: Dual-echo, T1-weighted, and MT scans of the brain were obtained from 77 patients with varying MS courses and 20 age- and sex-matched control subjects. To create MT histograms of the normal- appearing cerebral tissue, MS lesions were segmented from dual-echo scans, superimposed automatically, and hulled out from the coregistered and scalp- stripped MTR maps. Average MTR, peak heights, and peak position were considered. T2 and T1 lesion loads, average lesion MTR, and brain volume were also measured. Results Average histogram MTR (p <0.0001) and peak position (p <0.0001) from patients with relapsing-remitting MS (RMMS were lower than those from control subjects. Patients with primary progressive MS (PPMS) had lower average histogram MTR (p = 0.002) and histogram peak height (p = 0.01) than control subjects. Patients with secondary progressive MS (SPMS) had a lower peak height (p = 0.05) than those with RRMS. Average lesion MTR (p <0.0001) correlated highly with the histogram MTR. Average histogram MTR (p <0.0001) and T2 lesion load (p = 0.001) correlated highly with brain volume. Conclusions: The amount of microscopic changes account for an important fraction of the lesion load in MS. They may contribute to the development of brain atrophy and tend to be more evident in patients with secondary progressive MS.

Original languageEnglish
Pages (from-to)186-193
Number of pages8
JournalNeurology
Volume54
Issue number1
Publication statusPublished - Jan 11 2000

Keywords

  • Magnetization transfer imaging
  • MRI
  • MS
  • Normal-appearing brain tissue

ASJC Scopus subject areas

  • Neuroscience(all)

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