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DOI: 10.1055/s-0040-1708415
Amyloid-related changes of basal forebrain volume and precuneus functional connectivity in Subjective Cognitive Decline patients
Publication History
Publication Date:
08 April 2020 (online)
Ziel/Aim To examine whether brain amyloidosis in Subjective Cognitive Decline (SCD) patients is associated with concurrent changes in two Alzheimer (AD) - related structural and functional MRI markers, cholinergic basal forebrain (BF) volume and precuneus resting-state functional connectivity (FC).
Methodik/Methods Based on visual ratings of Florbetaben (FBB) PET scans (Neuraceq™, Life Radiopharma, Berlin), N(SCDAβ+) = 25 amyloid-positive and N(SCDAβ-) = 25 age- & sex-matched amyloid-negative SCD patients from the DELCODE study (1) were selected for comparison (mean age = 74.3 years, 60 % male). BF nuclei volumes were extracted from structural MRI using established methods (2). Local (e.g. regional homogeneity [ReHo]; (fractional) amplitude of low-frequency fluctuations) and global measures (seed-based connectivity; degree centrality) of precuneal FC were derived from resting-state fMRI data. To explore linear associations of these imaging markers with amyloid load, global and precuneus FBB standard uptake value ratios (SUVR, relative to cerebellar cortex (3)) were quantified using PMOD.
Ergebnisse/Results BF volume was significantly smaller for SCDAβ+, especially for the Nucleus basalis Meynert [CH4]. There was a significant correlation of total BF and CH4 volumes with global FBB SUVR across groups. Regarding FC measures, SCDAβ+ showed significantly higher ReHo in bilateral precuneus areas and stronger seed-based connectivity of the precuneus with occipital regions than SCDAβ-. The latter correlated positively with global (SCDAβ+) and precuneus FBB SUVR (SCDAβ+ and SCDAβ-).
Schlussfolgerungen/Conclusions In SCD patients, AD-related changes in posterior BF volume and precuneus FC may be driven by the extent of brain amyloid depositions.
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Literatur/References
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- 2 IEEE TRPMS , 2019; , 3 , No 3, 352-63 .
- 3 IEEE TMI , 2011; , 30 , 879-92 .
- 4 J Nucl Med Mol Img , 2007; , 34 , 2082-87 .