title: The contribution of myelin to magnetic susceptibility-weighted contrasts in high-field MRI of the brain.
abstract: T(2)*-weighted gradient-echo MRI images at high field (≥ 7T) have shown rich image contrast within and between brain regions. The source for these contrast variations has been primarily attributed to tissue magnetic susceptibility differences. In this study, the contribution of myelin to both T(2)* and frequency contrasts is investigated using a mouse model of demyelination based on a cuprizone diet. The demyelinated brains showed significantly increased T(2)* in white matter and a substantial reduction in gray-white matter frequency contrast, suggesting that myelin is a primary source for these contrasts. Comparison of in-vivo and in-vitro data showed that, although tissue T(2)* values were reduced by formalin fixation, gray-white matter frequency contrast was relatively unaffected and fixation had a negligible effect on cuprizone-induced changes in T(2)* and frequency contrasts.
authors: Advanced MRI Section, Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA. jonghoyi@upenn.edu
authors: Jongho
authors: J
authors: Lee
authors: Karin
authors: K
authors: Shmueli
authors: Byeong-Teck
authors: BT
authors: Kang
authors: Bing
authors: B
authors: Yao
authors: Masaki
authors: M
authors: Fukunaga
authors: Peter
authors: P
authors: van Gelderen
authors: Sara
authors: S
authors: Palumbo
authors: Francesca
authors: F
authors: Bosetti
authors: Afonso C
authors: AC
authors: Silva
authors: Jeff H
authors: JH
authors: Duyn
mesh_terms: D000818:Animals; D001921:Brain / Q000473:pathology*; D003711:Demyelinating Diseases; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009186:Myelin Sheath