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Measurement of central µ-opioid receptor binding in vivo with PET and [11C]carfentanil: a test–retest study in healthy subjects

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Abstract

Purpose

[11C]Carfentanil has been widely used in positron emission tomography (PET) studies for measuring µ-opioid receptor binding in humans, but the reproducibility of the binding parameter estimates is unknown.

Materials and methods

Eight healthy volunteers were scanned twice during the same day with [11C]carfentanil PET, and binding to receptors was assessed with both reference tissue and arterial plasma input-based models using region of interest (ROI) and voxel-based quantification.

Results

The two-tissue compartmental model distribution volume (VT) was highly reproducible as indicated by low variability (VAR < 6%) and high intraclass correlation coefficients (ICC > 0.93). BPND (BP relative to the nondisplaceable tissue compartment) was also highly reproducible (VAR < 10%, ICC > 0.90) both at ROI- and voxel-level, and reference tissue-based models provided stable estimates after 40 min.

Conclusions

The reproducibility of [11C]carfentanil binding parameter estimates is excellent with outcome measures based on both arterial plasma and reference tissue input, and a scanning time of 40 min appears sufficient.

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Acknowledgements

The staffs of the MRI and PET units at Turku PET Centre are gratefully appreciated.

Disclosures/Conflicts of Interest

The authors declare no conflicts of interest.

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Correspondence to Jussi Hirvonen.

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Hirvonen, J., Aalto, S., Hagelberg, N. et al. Measurement of central µ-opioid receptor binding in vivo with PET and [11C]carfentanil: a test–retest study in healthy subjects. Eur J Nucl Med Mol Imaging 36, 275–286 (2009). https://doi.org/10.1007/s00259-008-0935-6

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  • DOI: https://doi.org/10.1007/s00259-008-0935-6

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