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Increased cerebral blood flow with increased amyloid burden in the preclinical phase of alzheimer's disease
Fazlollahi, Amir Calamante, Fernando Liang, Xiaoyun Bourgeat, Pierrick Raniga, Parnesh Dore, Vincent Fripp, Jurgen Ames, David Masters, Colin L. Rowe, Christopher C.
Fazlollahi, Amir
Calamante, Fernando
Liang, Xiaoyun
Bourgeat, Pierrick
Raniga, Parnesh
Dore, Vincent
Fripp, Jurgen
Ames, David
Masters, Colin L.
Rowe, Christopher C.
Abstract
Background Arterial spin labeling (ASL) is an emerging MRI technique for noninvasive measurement of cerebral blood flow (CBF) that has been used to show hemodynamic changes in the brains of people with Alzheimer's disease (AD). CBF changes have been measured using positron emission tomography (PET) across the AD spectrum, but ASL showed limited success in measuring CBF variations in the preclinical phase of AD, where amyloid β (Aβ) plaques accumulate in the decades prior to symptom onset. Purpose To investigate the relationship between CBF measured by multiphase‐pseudocontinuous‐ASL (MP‐PCASL) and Aβ burden as measured by 11C‐PiB PET imaging in a study of cognitively normal (CN) subjects age over 65. Study Type Cross‐sectional. Population Forty‐six CN subjects including 33 with low levels of Aβ burden and 13 with high levels of Aβ. Field Strength/Sequence 3T/3D MP‐PCASL. Assessment The MP‐PCASL method was chosen because it has a high signal‐to‐noise ratio. Furthermore, the data were analyzed using an efficient processing pipeline consisting of motion correction, ASL motion correction imprecision removal, temporal and spatial filtering, and partial volume effect correction. Statistical Tests General Linear Model. Results In CN subjects positive for Aβ burden (n = 13), we observed a positive correlation between CBF and Aβ burden in the hippocampus, amygdala, caudate (P < 0.01), frontal, temporal, and insula (P < 0.05). Data Conclusion To the best of our knowledge, this is the first study using MP‐PCASL in the study of AD, and the results suggest a potential compensatory hemodynamic mechanism that protects against pathology in the early stages of AD.
Keywords
perfusion, multiphase PCASL, preclinical Alzheimer's disease, CBF, amyloid
Date
2020
Type
Journal article
Journal
Journal of Magnetic Resonance Imaging
Book
Volume
51
Issue
2
Page Range
505-513
Article Number
ACU Department
Mary MacKillop Institute for Health Research
Faculty of Health Sciences
Faculty of Health Sciences
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Relation URI
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Event URL
Open Access Status
License
File Access
Controlled