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Reproducibility of [11 C]FLB 457 binding in extrastriatal regions.
1Division of Advanced Technology for Medical Imaging, National Institute of Radiological Sciences, Chiba, Japan.
Nuclear Medicine Communications
|October 19, 2001
Summary
This study shows that the radioligand [11C]FLB 457 provides reliable measurements of extrastriatal D2 dopamine receptors using PET scans, supporting its use in psychiatric research.
Area of Science:
- Neuroscience
- Radiochemistry
- Psychiatric Research
Background:
- Extrastriatal D2 dopamine receptors are crucial targets for understanding and treating psychiatric disorders.
- Positron emission tomography (PET) with high-affinity radioligands enables measurement of these receptors.
- [11C]FLB 457 is a high-affinity radioligand suitable for detecting low concentrations of D2 receptors.
Purpose of the Study:
- To evaluate the test-retest variability and reliability of [11C]FLB 457 binding measurements.
- To assess the suitability of [11C]FLB 457 for quantitative analysis of extrastriatal D2 receptors.
- To validate the use of a reference tissue model for [11C]FLB 457 PET imaging.
Main Methods:
- Eight healthy male subjects underwent two [11C]FLB 457 PET scans.
- Cerebellar radioactivity served as the reference region.
- Binding potentials (BPs) were calculated using a reference tissue model for regions of interest (ROIs) and pixel-wise parametric images.
Main Results:
- Good test-retest reproducibility was observed for [11C]FLB 457 binding.
- Mean variability ranged from 4.5% (thalamus) to 15.5% (hippocampus).
- Parametric images also demonstrated good reproducibility.
Conclusions:
- [11C]FLB 457 is suitable for the quantitative evaluation of extrastriatal D2 receptors.
- The radioligand demonstrates good reliability for protocols requiring repeated measurements.
- This supports the use of [11C]FLB 457 in psychiatric research and pharmacotherapy studies.