Erschienen in:
01.01.2016 | Original Article
Amyloid imaging in cognitively normal older adults: comparison between 18F-flutemetamol and 11C-Pittsburgh compound B
verfasst von:
Katarzyna Adamczuk, Jolien Schaeverbeke, Natalie Nelissen, Veerle Neyens, Mathieu Vandenbulcke, Karolien Goffin, Johan Lilja, Kelly Hilven, Patrick Dupont, Koen Van Laere, Rik Vandenberghe
Erschienen in:
European Journal of Nuclear Medicine and Molecular Imaging
|
Ausgabe 1/2016
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Abstract
Purpose
Preclinical, or asymptomatic, Alzheimer’s disease (AD) refers to the presence of positive AD biomarkers in the absence of cognitive deficits. This research concept is being applied to define target populations for clinical drug development. In a prospective community-recruited cohort of cognitively intact older adults, we compared two amyloid imaging markers within subjects: 18F-flutemetamol and 11C-Pittsburgh compound B (PIB).
Methods
In 32 community-recruited cognitively intact older adults aged between 65 and 80 years, we determined the concordance between binary classification based on 18F-flutemetamol versus 11C-PIB according to semiquantitative assessment (standardized uptake value ratio in composite cortical volume, SUVRcomp) and, alternatively, according to visual reads. We also determined the correlation between 18F-flutemetamol and 11C-PIB SUVR and evaluated how this was affected by the reference region chosen (cerebellar grey matter versus pons) and the use of partial volume correction (PVC) in this population.
Results
Binary classification based on semiquantitative assessment was concordant between 18F-flutemetamol and 11C-PIB in 94 % of cases. Concordance of blinded binary visual reads between tracers was 84 %. The Spearman correlation between 18F-flutemetamol and 11C-PIB SUVRcomp with cerebellar grey matter as reference region was 0.84, with a slope of 0.98. Correlations in neocortical regions were significantly lower with the pons as reference region. PVC improved the correlation in striatum and medial temporal cortex.
Conclusion
For the definition of preclinical AD based on 18F-flutemetamol, concordance with 11C-PIB was highest using semiquantitative assessment with cerebellar grey matter as reference region.