title: Possible effects of iron deposition on the measurement of DTI metrics in deep gray matter nuclei: an in vitro and in vivo study.
abstract: The aim of this study was to explore the possible effects of iron deposition on the measurement of diffusion tensor imaging (DTI) metrics in deep gray matter nuclei in the normal human brain. Susceptibility-weighted imaging (SWI) and DTI were performed on nine MnCl2 phantoms and 85 healthy adults. The SWI phase value (PV) and DTI metrics including fractional anisotropy (FA), mean diffusivity (MD), radial diffusivity (RD), and axial diffusivity (AD) were measured in phantoms and the frontal white matter (FWM), caudate (CA), putamen (PU), and globus pallidus (GP) of both hemispheres in healthy adults. The FA correlated linearly with PV and MnCl2 concentrations in phantoms. The PV in the PU was positively correlated with age. The FA was negatively correlated with age in the FWM and positively correlated with age in the PU. AD positively correlated with PV in CA, PU, and GP. FA increased with elevated PV in the PU when controlling for the impact of age. The age-related increasing of PV, which predominantly caused by iron deposition, probably influences the measurement of DTI metrics in the PU in the normal human brain and should be considered when diagnosing various neurodegenerative diseases using DTI metrics.
authors.affiliation: Department of Radiology, Southwest Hospital, Third Military Medical University, Chongqing 400038, China.
authors.forename: Jiuquan
authors.initials: J
authors.lastname: Zhang
authors.forename: Ran
authors.initials: R
authors.lastname: Tao
authors.forename: Chen
authors.initials: C
authors.lastname: Liu
authors.forename: Wenjing
authors.initials: W
authors.lastname: Wu
authors.forename: Yanwei
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jinguo
authors.initials: J
authors.lastname: Cui
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001921:Brain / Q000033:anatomy & histology*; D056324:Diffusion Tensor Imaging / Q000379:methods*; D005260:Female; D006801:Humans; D007501:Iron / Q000494:pharmacology*; D008297:Male; D008875:Middle Aged; D055815:Young Adult
chemical_list: D007501:Iron
keywords: Apparent diffusion coefficient; Diffusion tensor imaging; Fractional anisotropy; Iron deposition; Susceptibility weighted imaging