Measuring longitudinal myelin water fraction in new multiple sclerosis lesions

Autor: Wendy S. Vargas, Elizabeth Monohan, Sneha Pandya, Ashish Raj, Timothy Vartanian, Thanh D. Nguyen, Sandra M. Hurtado Rúa, Susan A. Gauthier
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: NeuroImage: Clinical, Vol 9, Iss C, Pp 369-375 (2015)
Druh dokumentu: article
ISSN: 2213-1582
DOI: 10.1016/j.nicl.2015.09.003
Popis: Objectives: Investigating the potential of myelin repair strategies in multiple sclerosis (MS) requires an understanding of myelin dynamics during lesion evolution. The objective of this study is to longitudinally measure myelin water fraction (MWF), an MRI biomarker of myelin, in new MS lesions and to identify factors that influence their subsequent myelin content. Methods: Twenty-three MS patients were scanned with whole-brain Fast Acquisition with Spiral Trajectory and T2prep (FAST-T2) MWF mapping at baseline and median follow-up of 6 months. Eleven healthy controls (HC) confirmed the reproducibility of FAST-T2 in white matter regions of interests (ROIs) similar to a lesion size. A random-effect-model was implemented to determine the association between baseline clinical and lesion variables and the subsequent MWF. Results: ROI-based measurements in HCs were highly correlated between scans [mean r = 0.893 (.764–.967)]. In MS patients, 38 gadolinium enhancing (Gd+) and 25 new non-enhancing (Gd−) T2 hyperintense lesions (5.7 months, ±3.8) were identified. Significant improvement in MWF was seen in Gd+ lesions (0.035 ± 0.029, p
Databáze: Directory of Open Access Journals