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Mol Imaging Biol. 2014 Oct;16(5):699-709. doi: 10.1007/s11307-014-0729-0.

Reproducibility of non-invasive a1 adenosine receptor quantification in the rat brain using [(18)F]CPFPX and positron emission tomography.

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  • 1Institute of Neuroscience and Medicine (INM-2), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany,



The A1AR antagonist 8-cyclopentyl-3-(3-fluoropropyl)-1-propylxanthine ([(18)F]CPFPX) has recently been shown to be a suitable radiotracer for quantitative in vivo imaging of the A1 adenosine receptor (A1AR) in rats. The present study evaluates the reproducibility of non-invasive longitudinal A1AR studies with [(18)F]CPFPX and a dedicated small animal positron emission tomography (PET) scanner.


Twelve male Sprague Dawley rats underwent four repeated dynamic PET scans with a bolus injection of [(18)F]CPFPX. A1AR availability was determined by different non-invasive approaches including simplified and multilinear reference tissue (olfactory bulb)-based models and graphical methods. The outcome parameter binding potential (BP) was evaluated in terms of variability and reproducibility.


Repeated estimations of [(18)F]CPFPX BP ND gave reliable results with acceptable variability (mean 12 %) and reproducibility (intraclass correlation coefficients raging from 0.57 to 0.68) in cortical and subcortical regions of the rat brain. With regard to kinetic models, test-retest stability of the simplified reference-tissue model (SRTM) was superior to multilinear and graphical approaches.


Non-invasive quantification of A1AR density in the rat brain is reproducible and reliable with [(18)F]CPFPX PET and allows longitudinal designs of in vivo imaging studies in rodents.

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