Fractional anisotropy shows differential reduction in frontal-subcortical fiber bundles - A longitudinal MRI study of 76 middle-aged and older adults
Motivated by the frontal- and white matter (WM) retrogenesis hypotheses and the as- sumptions that fronto-striatal circuits are especially vulnerable in normal aging, the goal of the present study was to identify fiber bundles connecting subcortical nuclei and frontal ar- eas and obtain site-specifi...
Ausführliche Beschreibung
Autor*in: |
Alexandra eVik [verfasserIn] Erlend eHodneland [verfasserIn] Judit eHaász [verfasserIn] Martin eYstad [verfasserIn] Astri Johansen Lundervold [verfasserIn] Arvid eLundervold [verfasserIn] |
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E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2015 |
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Übergeordnetes Werk: |
In: Frontiers in Aging Neuroscience - Frontiers Media S.A., 2010, 7(2015) |
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Übergeordnetes Werk: |
volume:7 ; year:2015 |
Links: |
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DOI / URN: |
10.3389/fnagi.2015.00081 |
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Katalog-ID: |
DOAJ028279123 |
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Fractional anisotropy shows differential reduction in frontal-subcortical fiber bundles - A longitudinal MRI study of 76 middle-aged and older adults |
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Motivated by the frontal- and white matter (WM) retrogenesis hypotheses and the as- sumptions that fronto-striatal circuits are especially vulnerable in normal aging, the goal of the present study was to identify fiber bundles connecting subcortical nuclei and frontal ar- eas and obtain site-specific information about age related fractional anisotropy (FA) changes. Multimodal magnetic resonance image acquisitions (3D T1-weighted and diffusion weighted imaging (DWI)) were obtained from healthy older adults (N=76, range 49-80 years at inclusion) at two time points, three years apart. A subset of the participants (N=24) was included at a third time-point. In addition to the frontal-subcortical fibers, the anterior callosal fiber (ACF) and the corticospinal tract (CST) was investigated by its mean FA together with tract parameterization analysis. Our results demonstrated fronto-striatal structural connec- tivity decline (reduced FA) in normal aging with substantial inter-individual differences. The tract parameterization analysis showed that the along tract FA profiles were characterized by piece-wise differential changes along their extension rather than being uniformly affected. To the best of our knowledge, this is the first longitudinal study detecting age-related changes in frontal-subcortical WM connections in normal aging. |
abstractGer |
Motivated by the frontal- and white matter (WM) retrogenesis hypotheses and the as- sumptions that fronto-striatal circuits are especially vulnerable in normal aging, the goal of the present study was to identify fiber bundles connecting subcortical nuclei and frontal ar- eas and obtain site-specific information about age related fractional anisotropy (FA) changes. Multimodal magnetic resonance image acquisitions (3D T1-weighted and diffusion weighted imaging (DWI)) were obtained from healthy older adults (N=76, range 49-80 years at inclusion) at two time points, three years apart. A subset of the participants (N=24) was included at a third time-point. In addition to the frontal-subcortical fibers, the anterior callosal fiber (ACF) and the corticospinal tract (CST) was investigated by its mean FA together with tract parameterization analysis. Our results demonstrated fronto-striatal structural connec- tivity decline (reduced FA) in normal aging with substantial inter-individual differences. The tract parameterization analysis showed that the along tract FA profiles were characterized by piece-wise differential changes along their extension rather than being uniformly affected. To the best of our knowledge, this is the first longitudinal study detecting age-related changes in frontal-subcortical WM connections in normal aging. |
abstract_unstemmed |
Motivated by the frontal- and white matter (WM) retrogenesis hypotheses and the as- sumptions that fronto-striatal circuits are especially vulnerable in normal aging, the goal of the present study was to identify fiber bundles connecting subcortical nuclei and frontal ar- eas and obtain site-specific information about age related fractional anisotropy (FA) changes. Multimodal magnetic resonance image acquisitions (3D T1-weighted and diffusion weighted imaging (DWI)) were obtained from healthy older adults (N=76, range 49-80 years at inclusion) at two time points, three years apart. A subset of the participants (N=24) was included at a third time-point. In addition to the frontal-subcortical fibers, the anterior callosal fiber (ACF) and the corticospinal tract (CST) was investigated by its mean FA together with tract parameterization analysis. Our results demonstrated fronto-striatal structural connec- tivity decline (reduced FA) in normal aging with substantial inter-individual differences. The tract parameterization analysis showed that the along tract FA profiles were characterized by piece-wise differential changes along their extension rather than being uniformly affected. To the best of our knowledge, this is the first longitudinal study detecting age-related changes in frontal-subcortical WM connections in normal aging. |
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Fractional anisotropy shows differential reduction in frontal-subcortical fiber bundles - A longitudinal MRI study of 76 middle-aged and older adults |
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Multimodal magnetic resonance image acquisitions (3D T1-weighted and diffusion weighted imaging (DWI)) were obtained from healthy older adults (N=76, range 49-80 years at inclusion) at two time points, three years apart. A subset of the participants (N=24) was included at a third time-point. In addition to the frontal-subcortical fibers, the anterior callosal fiber (ACF) and the corticospinal tract (CST) was investigated by its mean FA together with tract parameterization analysis. Our results demonstrated fronto-striatal structural connec- tivity decline (reduced FA) in normal aging with substantial inter-individual differences. The tract parameterization analysis showed that the along tract FA profiles were characterized by piece-wise differential changes along their extension rather than being uniformly affected. 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