Measurement of 18F-FDG concentrations in blood samples: Comparison of direct calibration and standard solution methods

Henri N.J.M. Greuter*, Ronald Boellaard, Arthur Van Lingen, Eric J.F. Franssen, Adriaan A. Lammertsma

*Corresponding author for this work

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Objective: The purpose of this study was to compare the accuracy and reliability of 2 well counter methods for measuring the activity concentration of 18F-FDG in blood samples. Methods: Three to 5 blood samples from 154 patient studies were weighed and measured in a well counter. The 18F-FDG activity concentration was derived using, first, a direct calibration factor to convert measured well counter readings into activity concentration and, second, a comparison of measured counts with those of a specified standard solution. Results: The ratio between the activity concentration results of the 2 methods was 0.996 ± 0.033, indicating that the methods provided equal results. Conclusion: Because the standard solution method is more prone to human error, less reproducible, and more labor intensive, preference should be given to the direct calibration method.

Original languageEnglish
Pages (from-to)206-209
Number of pages4
JournalJournal of Nuclear Medicine Technology
Issue number4
Publication statusPublished - 1 Dec 2003

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