TY - JOUR
T1 - Nonparenchymal fluid is the source of increased mean diffusivity in preclinical Alzheimer's disease
AU - Sepehrband, Farshid
AU - Cabeen, Ryan P.
AU - Barisano, Giuseppe
AU - Sheikh-Bahaei, Nasim
AU - Choupan, Jeiran
AU - Law, Meng
AU - Toga, Arthur W.
AU - Alzheimer's Disease Neuroimaging Initiative
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Introduction: Although increased mean diffusivity of the white matter has been repeatedly linked to Alzheimer's disease pathology, the underlying mechanism is not known. Methods: Here, we used ADNI-3 multishell diffusion magnetic resonance imaging data to separate the diffusion signal of the parenchyma from less hindered fluid pools within the white matter such as perivascular space fluid and fluid-filled cavities. Results: We found that the source of the pathological increase of the mean diffusivity is the increased nonparenchymal fluid, often found in lacunes and perivascular spaces. In this cohort, the cognitive decline was significantly associated with the fluid increase and not with the microstructural changes of the white matter parenchyma itself. The white matter fluid increase was dominantly observed in the sagittal stratum and anterior thalamic radiation. Discussion: These findings are positive steps toward understanding the pathophysiology of white matter alteration and its role in the cognitive decline.
AB - Introduction: Although increased mean diffusivity of the white matter has been repeatedly linked to Alzheimer's disease pathology, the underlying mechanism is not known. Methods: Here, we used ADNI-3 multishell diffusion magnetic resonance imaging data to separate the diffusion signal of the parenchyma from less hindered fluid pools within the white matter such as perivascular space fluid and fluid-filled cavities. Results: We found that the source of the pathological increase of the mean diffusivity is the increased nonparenchymal fluid, often found in lacunes and perivascular spaces. In this cohort, the cognitive decline was significantly associated with the fluid increase and not with the microstructural changes of the white matter parenchyma itself. The white matter fluid increase was dominantly observed in the sagittal stratum and anterior thalamic radiation. Discussion: These findings are positive steps toward understanding the pathophysiology of white matter alteration and its role in the cognitive decline.
KW - Nonparenchymal fluid
KW - Preclinical AD
KW - White matter alteration
KW - White matter fluid
UR - http://www.scopus.com/inward/record.url?scp=85064525260&partnerID=8YFLogxK
U2 - 10.1016/j.dadm.2019.03.002
DO - 10.1016/j.dadm.2019.03.002
M3 - Article
AN - SCOPUS:85064525260
VL - 11
SP - 348
EP - 354
JO - Alzheimer's and Dementia: Diagnosis, Assessment and Disease Monitoring
JF - Alzheimer's and Dementia: Diagnosis, Assessment and Disease Monitoring
SN - 2352-8729
ER -