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Related Experiment Videos

Reproducibility studies with 11C-DTBZ, a monoamine vesicular transporter inhibitor in healthy human subjects.

G L Chan1, J E Holden, A J Stoessl

  • 1TRIUMF and Neurodegenerative Disorders Center, University of British Columbia, Vancouver, Canada.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|February 20, 1999
PubMed
Summary

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(+/-)-alpha-[11C] dihydrotetrabenazine (DTBZ) positron emission tomography (PET) provides reproducible measurements of striatal vesicular monoamine transporter density. Occipital cortex reference regions offer higher reliability than cerebellar regions for DTBZ PET analysis.

Area of Science:

  • Neuroscience
  • Radiochemistry
  • Medical Imaging

Background:

  • Positron emission tomography (PET) enables in vivo imaging of neurotransmitter systems.
  • Vesicular monoamine transporter (VMAT2) is a key target for neuroimaging.
  • (+/-)-alpha-[11C] dihydrotetrabenazine (DTBZ) is a PET tracer for VMAT2.

Purpose of the Study:

  • To assess the reproducibility of DTBZ PET measures in healthy human subjects.
  • To compare the reliability of different quantitative analysis methods and reference regions.

Main Methods:

  • Ten healthy subjects (aged 22-76 years) underwent DTBZ PET scans.
  • Scan-to-scan variation was determined for radioactivity ratios, Logan distribution volume (DV), and Logan Bmax/Kd values.
  • Analyses included plasma-input and tissue-input models, with occipital cortex and cerebellum as reference regions.

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Main Results:

  • Radioactivity ratios, plasma-input Bmax/Kd, and tissue-input Bmax/Kd showed higher reliability than plasma-input total DV.
  • Using the occipital cortex as a reference region yielded higher reliability compared to the cerebellum.
  • DTBZ PET measures demonstrated good reproducibility in vivo.

Conclusions:

  • DTBZ is a reliable PET tracer for reproducible in vivo measurement of striatal VMAT2 density.
  • Careful selection of reference regions is crucial for accurate DTBZ PET data analysis.
  • Potential alterations in DTBZ binding in the occipital cortex or cerebellum warrant consideration.