PURPOSE: To determine normal T2-relaxation values from different brain areas in healthy adults, assess age-related T2-relaxation changes in those sites, and evaluate potential gender-related T2-relaxation value differences. MATERIALS AND METHODS: We performed proton-density and T2-weighted imaging in 60 healthy adults (male: 38, age range = 31-64 years, mean age ± SD = 46.1 ± 9.3 years; female: 22, age range = 37-66 years, mean age ± SD = 49.5 ± 8.3 years), using a 3.0 Tesla MRI scanner. T2-relaxation values were calculated voxel-by-voxel from proton-density and T2-weighted images, and whole-brain T2-relaxation maps were constructed and normalized to a common space. A set of regions-of-interest were outlined within the basal ganglia, limbic, frontal, parietal, temporal, occipital, thalamic, hypothalamic, cerebellar, and pontine regions using mean background images derived from normalized and averaged T2-weighted images of all individuals, and regional T2-relaxation values were determined from these regions-of-interest and normalized T2-relaxation maps. Pearson's correlations were calculated between T2-relaxation values and age, and male-female differences evaluated with independent-samples t-tests. RESULTS: T2-relaxation values typically increased with age in multiple brain sites; only a few regions showed declines, including the putamen and ventral pons. Sex-related differences in T2-relaxation values appeared in basal ganglia, frontal, temporal, occipital, and cerebellar regions; males showed higher values over females in these sites. CONCLUSION: Establishment of normative adult T2-relaxation values over different brain areas, with age and sex as co-factors, offers baseline values against which disease-related tissue changes can be assessed.
PURPOSE: To determine normal T2-relaxation values from different brain areas in healthy adults, assess age-related T2-relaxation changes in those sites, and evaluate potential gender-related T2-relaxation value differences. MATERIALS AND METHODS: We performed proton-density and T2-weighted imaging in 60 healthy adults (male: 38, age range = 31-64 years, mean age ± SD = 46.1 ± 9.3 years; female: 22, age range = 37-66 years, mean age ± SD = 49.5 ± 8.3 years), using a 3.0 Tesla MRI scanner. T2-relaxation values were calculated voxel-by-voxel from proton-density and T2-weighted images, and whole-brain T2-relaxation maps were constructed and normalized to a common space. A set of regions-of-interest were outlined within the basal ganglia, limbic, frontal, parietal, temporal, occipital, thalamic, hypothalamic, cerebellar, and pontine regions using mean background images derived from normalized and averaged T2-weighted images of all individuals, and regional T2-relaxation values were determined from these regions-of-interest and normalized T2-relaxation maps. Pearson's correlations were calculated between T2-relaxation values and age, and male-female differences evaluated with independent-samples t-tests. RESULTS: T2-relaxation values typically increased with age in multiple brain sites; only a few regions showed declines, including the putamen and ventral pons. Sex-related differences in T2-relaxation values appeared in basal ganglia, frontal, temporal, occipital, and cerebellar regions; males showed higher values over females in these sites. CONCLUSION: Establishment of normative adult T2-relaxation values over different brain areas, with age and sex as co-factors, offers baseline values against which disease-related tissue changes can be assessed.
Authors: Nancy A Pike; Bhaswati Roy; Ritika Gupta; Sadhana Singh; Mary A Woo; Nancy J Halnon; Alan B Lewis; Rajesh Kumar Journal: J Neurosci Res Date: 2018-01-06 Impact factor: 4.164
Authors: Robert J Dawe; David A Bennett; Julie A Schneider; Sue E Leurgans; Aikaterini Kotrotsou; Patricia A Boyle; Konstantinos Arfanakis Journal: Neurobiol Aging Date: 2014-02-06 Impact factor: 4.673
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Authors: V V Eylers; A A Maudsley; P Bronzlik; P R Dellani; H Lanfermann; X-Q Ding Journal: AJNR Am J Neuroradiol Date: 2015-11-12 Impact factor: 3.825