Biodistribution and Radiation Dosimetry in Humans of a New PET Ligand, 18F-PBR06, to Image Translocator Protein (18 kDa)
Open Access
- 15 December 2009
- journal article
- Published by Society of Nuclear Medicine in Journal of Nuclear Medicine
- Vol. 51 (1), 145-149
- https://doi.org/10.2967/jnumed.109.068064
Abstract
As a PET biomarker for inflammation, translocator protein (18 kDa) (TSPO) can be measured with an 18F-labeled aryloxyanilide, 18F-N-fluoroacetyl-N-(2,5-dimethoxybenzyl)-2-phenoxyaniline (18F-PBR06), in the human brain. The objective of this study was to estimate the radiation absorbed doses of 18F-PBR06 based on biodistribution data in humans. Methods: After the injection of 18F-PBR06, images were acquired from head to thigh in 7 healthy humans. Urine was collected at various time points. Radiation absorbed doses were estimated by the MIRD scheme. Results: Moderate to high levels of radioactivity were observed in organs with high densities of TSPO and in organs of metabolism and excretion. Bone had low levels of radioactivity. The effective dose was 18.5 μSv/MBq. Conclusion: The effective dose of 18F-PBR06, compared with other 18F radioligands, was moderate. This radioligand had negligible defluorination, as indirectly assessed by bone radioactivity. Doses to the gallbladder wall and spleen may limit the amount of permissible injected radioactivity.This publication has 14 references indexed in Scilit:
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