| Autor: |
Chen X; Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Jülich Research Centre, Jülich, Germany.; Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany.; Department of Neurology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China., Onur OA; Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Jülich Research Centre, Jülich, Germany.; Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany., Richter N; Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Jülich Research Centre, Jülich, Germany.; Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany., Fassbender R; Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany., Gramespacher H; Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany., Befahr Q; Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Jülich Research Centre, Jülich, Germany.; Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany., von Reutern B; Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Jülich Research Centre, Jülich, Germany.; Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany., Dillen K; Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Jülich Research Centre, Jülich, Germany., Jacobs HIL; Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.; Department of Psychiatry and Neuropsychology, Alzheimer Centre, Limburg, School for Mental Health and Neuroscience, Maastricht University, Maastricht, the Netherlands., Kukolja J; Department of Neurology and Clinical Neurophysiology, Helios University Hospital Wuppertal, Wuppertal, Germany.; Department of Neurology, Faculty of Health, Witten/Herdecke University, Witten, Germany., Fink GR; Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Jülich Research Centre, Jülich, Germany.; Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany., Dronse J; Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Jülich Research Centre, Jülich, Germany.; Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany. |
| Abstrakt: |
Background: Recently, a new resting-state functional magnetic resonance imaging (rs-fMRI) measure to evaluate the concordance between different rs-fMRI metrics has been proposed and has not been investigated in Alzheimer's disease (AD). Methods: 3T rs-fMRI data were obtained from healthy young controls (YC, n = 26), healthy senior controls (SC, n = 29), and AD patients ( n = 35). The fractional amplitude of low-frequency fluctuations (fALFF), regional homogeneity (ReHo), and degree centrality (DC) were analyzed, followed by the calculation of their concordance using Kendall's W for each brain voxel across time. Group differences in the concordance were compared globally, within seven intrinsic brain networks, and on a voxel-by-voxel basis with covariates of age, sex, head motion, and gray matter volume. Results: The global concordance was lowest in AD among the three groups, with similar differences for the single metrics. When comparing AD to SC, reductions of concordance were detected in each of the investigated networks apart from the limbic network. For SC in comparison to YC, lower global concordance without any network-level difference was observed. Voxel-wise analyses revealed lower concordance in the right middle temporal gyrus in AD compared to SC and lower concordance in the left middle frontal gyrus in SC compared to YC. Lower fALFF were observed in the right angular gyrus in AD in comparison to SC, but ReHo and DC showed no group differences. Conclusions: The concordance of resting-state measures differentiates AD from healthy aging and may represent a novel imaging marker in AD. |
