Correlations between magnetization transfer metrics and other magnetic resonance abnormalities in multiple sclerosis.

Abstract:

:Magnetization transfer imaging (MTI) is a magnetic resonance imaging (MRI) technique that is now used in multiple sclerosis (MS) studies, and is thought to have a higher pathological specificity than conventional T2-weighted imaging. This review outlines the correlations between magnetization transfer (MT) metrics and other MRI abnormalities in the study of individual MS lesions and in the assessment of MS disease burden. MTI studies of individual MS lesions confirm the pathological heterogeneity of T2-weighted MRI abnormalities and the potential role of unenhanced T1-weighted hypointensities as specific markers of localized severe white matter disruption. Correlative cross-sectional and longitudinal studies using MTI and gadolinium (Gd)-enhanced MRI reveal that MTI findings may vary in lesions with different patterns of enhancement, and that MTI abnormalities are closely related to the onset and recovery of blood-brain barrier disruption in new MS plaques. MTI lesion load (LL) is highly correlated with T2-weighted MRI LL, but it has a limited reliability as a measure of MS disease burden. On the contrary, measures obtained from MTI scans using whole-brain histogram analysis are highly correlated with the extent of MS abnormalities on conventional MRI scans, and predict patients' clinical disability well, since they are sensitive to the amounts of both macro- and microscopic MS disease burden in the whole brain and in specific regions. The correlations between MTI metrics and conventional MRI findings suggest that: (a) MTI is sensitive to different stages of lesion pathology and pathological evolution in MS patients; and (b) MT histogram analysis can provide a more global assessment of MS disease burden, since it encompasses both macro- and microscopic MS pathology.

journal_name

Neurology

journal_title

Neurology

authors

Rovaris M,Horsfield MA,Filippi M

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

S40-5

issue

5 Suppl 3

eissn

0028-3878

issn

1526-632X

journal_volume

53

pub_type

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