Basal ganglia intensity indices and diffusion weighted imaging in manganese-exposed welders
| Autor: | Brad A. Racette, Susan R. Criswell, Keith M. Erikson, Michael Aschner, Angela Hobson, Harvey Checkoway, John L Huang, Nima Golchin, Hubert P. Flores, Joel S. Perlmutter |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Adult
Male Pathology medicine.medical_specialty chemistry.chemical_element Manganese Air Pollutants Occupational Article Basal Ganglia Occupational Exposure Basal ganglia medicine Effective diffusion coefficient Humans Single-Blind Method Welding Chemistry Putamen Public Health Environmental and Occupational Health Neurotoxicity Middle Aged medicine.disease Intensity (physics) Globus pallidus Diffusion Magnetic Resonance Imaging Case-Control Studies Linear Models Female Diffusion MRI |
| Popis: | Objectives Manganese exposure leads to diffuse cerebral metal deposition with the highest concentration in the globus pallidus associated with increased T1-weighted MRI signal. T1 signal intensity in extra-pallidal basal ganglia (caudate and putamen) has not been studied in occupationally exposed workers. Diffusion weighted imaging is a non-invasive measure of neuronal damage and may provide a quantification of neurotoxicity associated with welding and manganese exposure. This study investigated extra-pallidal T1 basal ganglia signal intensity as a marker of manganese exposure and basal ganglia diffusion weighted imaging abnormalities as a potential marker of neurotoxicity. Methods A 3T MR case:control imaging study was performed on 18 welders and 18 age- and gender-matched controls. Basal ganglia regions of interest were identified for each subject. T1-weighted intensity indices and apparent diffusion coefficients were generated for each region. Results All regional indices were higher in welders than controls (p≤0.05). Combined basal ganglia (ρ=0.610), caudate (ρ=0.645), anterior (ρ=0.595) and posterior putamen (ρ=0.511) indices were more correlated with exposure than pallidal (ρ=0.484) index. Welder apparent diffusion coefficient values were lower than controls for globus pallidus (p=0.03) and anterior putamen (p=0.004). Conclusions Welders demonstrated elevated T1 indices throughout the basal ganglia. Combined basal ganglia, caudate and putamen indices were more correlated with exposure than pallidal index suggesting more inclusive basal ganglia sampling results in better exposure markers. Elevated indices were associated with diffusion weighted abnormalities in the pallidum and anterior putamen suggesting neurotoxicity in these regions. |
| Databáze: | OpenAIRE |
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