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Abstract
The current literature reports that the circulation half-life of PEG-modified vesicles is independent of lipid dose over the range of β4-400 μmol/ kg. The results presented in this paper indicate that PEG-modified vesicles exhibit a dose-dependent circulation half-life at even lower lipid doses. At lipid doses of 2.13, 1.30, 0.50 and 0.16 μmol/kg, the half-life for the blood pool clearance of activity of technetium-99m encapsulated in PEG-coated vesicles was approximately 20, 16, 4, and 2 hr respectively. There was no statistically significant difference in clearance half-life for lipid doses of 2.13 and 1.30 μmol/kg (Kruskal-Wallis Anova, p>0.05). These results suggest that the dose-independent range may be extended down to approximately 1 (μmol/kg but that at lower doses, the circulation half-life is dependent on the lipid dose. These results are discussed in terms of the mechanism of clearance of activity from the circulation and the potential utility of PEG-modified technetium-99m labeled vesicles as blood pool imaging agents for nuclear medicine.