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Noninvasive quantification of [18F]SynVesT-1 binding using simplified reference tissue model 2.

Mika Naganawa1, Jean-Dominique Gallezot2, Songye Li3

  • 1Department of Radiology and Biomedical Imaging, Yale School of Medicine, 801 Howard Avenue, PO Box 208048, New Haven, CT, 06520- 8048, USA. mika.naganawa@yale.edu.

European Journal of Nuclear Medicine and Molecular Imaging
|August 18, 2024
PubMed
Summary
This summary is machine-generated.

The study found that using population efflux rate values with the SRTM2 model and the [18F]SynVesT-1 radiotracer accurately estimates synaptic vesicle glycoprotein 2A (SV2A) binding. This method works reliably regardless of the reference region chosen.

Keywords:
Kinetic modelingNoninvasive quantificationPETReceptor imagingSynaptic vesicle glycoprotein 2A

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Area of Science:

  • Neuroimaging
  • Radiochemistry
  • Pharmacokinetics

Background:

  • Synaptic vesicle glycoprotein 2A (SV2A) is a target for neurodegenerative diseases.
  • [18F]SynVesT-1 is a novel PET radiotracer for imaging SV2A.
  • Accurate quantification of SV2A binding is crucial for clinical applications.

Purpose of the Study:

  • To evaluate the suitability of reference tissue models for estimating [18F]SynVesT-1 binding.
  • To compare different reference regions (centrum semiovale and cerebellum) for kinetic modeling.
  • To assess the accuracy of simplified reference tissue model (SRTM) variants for [18F]SynVesT-1.

Main Methods:

  • Seven healthy participants underwent 120-min PET scans with [18F]SynVesT-1.
  • One-tissue compartment (1TC) model analysis served as the gold standard for kinetic parameters.
  • SRTM, coupled SRTM (SRTMC), and SRTM2 were applied using centrum semiovale or cerebellum as reference regions.

Main Results:

  • The 1TC model provided gold-standard kinetic parameters.
  • SRTM2, utilizing population average efflux rate values, demonstrated the best agreement with 1TC estimates.
  • SRTM and SRTMC showed varying degrees of underestimation and instability depending on the reference region.

Conclusions:

  • SRTM2 with population average efflux rate values is recommended for [18F]SynVesT-1 kinetic analysis.
  • This approach provides reliable estimation of SV2A binding (BPND or DVR) irrespective of the reference region choice.
  • The findings support the clinical utility of [18F]SynVesT-1 for assessing SV2A.