Paper Info
Title
Age-associated reductions in cerebral blood flow are independent from regional atrophy.
Abstract
Prior studies have demonstrated decreasing cerebral blood flow (CBF) in normal aging, but the full spatial pattern and potential mechanism of changes in CBF remain to be elucidated. Specifically, existing data have not been entirely consistent regarding the spatial distribution of such changes, potentially a result of neglecting the effect of age-related tissue atrophy in CBF measurements. In this work, we use pulsed arterial-spin labelling to quantify regional CBF in 86 cognitively and physically healthy adults, aged 23 to 88years. Surface-based analyses were utilized to map regional decline in CBF and cortical thickness with advancing age, and to examine the spatial associations and dissociations between these metrics. Our results demonstrate regionally selective age-related reductions in cortical perfusion, involving the superior-frontal, orbito-frontal, superior-parietal, middle-inferior temporal, insular, precuneus, supramarginal, lateral-occipital and cingulate regions, while subcortical CBF was relatively preserved in aging. Regional effects of age on CBF differed from that of grey-matter atrophy. In addition, the pattern of CBF associations with age displays an interesting similarity with the default-mode network. These findings demonstrate the dissociation between regional CBF and structural alterations specific to normal aging, and augment our understanding of mechanisms of pathology in older adults.
Year
DOI
Venue
2011
10.1016/j.neuroimage.2010.12.032
NeuroImage
Keywords
Field
DocType
Cerebral blood flow (CBF),Aging,Arterial-spin labelling (ASL),Magnetic resonance imaging (MRI),Quantitative perfusion,Alzheimer's disease,Dementia,Cortical thickness,Cerebral cortex
Developmental psychology,Neuroscience,Precuneus,Cerebrovascular Circulation,Psychology,Cerebral blood flow,Cerebral cortex,Atrophy,Dementia,Perfusion,Magnetic resonance imaging
Journal
Volume
Issue
ISSN
55
2
1053-8119
Citations 
PageRank 
References 
17
1.58
14
Authors
3
Name
Order
Citations
PageRank
J Jean Chen11299.48
H Diana Rosas227312.23
David H Salat326119.62