Test-retest reproducibility of [11C]-(+)-propyl-hexahydro-naphtho-oxazin positron emission tomography using the bolus plus constant infusion paradigm

Mol Imaging. Mar-Apr 2013;12(2):77-82.


We examined the reproducibility of using the constant infusion paradigm for equilibrium measurement of D2/3 receptors using [11C]-(+)-propyl-hexahydro-naphtho-oxazin (PHNO) positron emission tomography (PET). Six subjects were scanned with a bolus plus constant infusion (Kbol = 80 minutes) of [11C]-(+)-PHNO. Binding potential (BPND) was computed using the equilibrium approach and compared to a simplified reference tissue model (SRTM). The rate of change in the concentration-activity curve from 60 to 90 minutes was -5 ± 13%/h in the caudate, putamen, substantia nigra, thalamus, and cerebellum but was 15 ± 15%/h in the ventral striatum and pallidum. Test-retest variability was lower in striatal compared to extrastriatal regions (4 ± 8% vs -8 ± 22%, respectively) using the equilibrium approach, with comparable results with SRTM. The equilibrium ratio and SRTM yielded reliable BPND estimates (intraclass correlation coefficient = 0.88 and 0.82, respectively). These studies support the reproducibility of the bolus plus constant infusion paradigm with [11C]-(+)-PHNO PET.

MeSH terms

  • Adult
  • Female
  • Humans
  • Male
  • Positron-Emission Tomography / methods*
  • Receptors, Dopamine D2 / metabolism
  • Reproducibility of Results
  • Young Adult


  • Receptors, Dopamine D2