Abstract
Objective
The positron emission tomography (PET) clinical utility of the sensitivity (γ) of uptake (Q) to a change in plasma glucose concentration (C) is investigated.
Methods
γ is obtained from data as [ln(Q 2/Q 1)] / [ln(C 2 / C 1)], using previously published intrapatient studies varying C within a single patient and some interpatient ones. It can be theoretically related to the half-saturation constant in the Michaelis–Menten quantification of competitive uptake. One of its uses is making uptake corrections for desired vs. actual C using \(Q_{2} = Q_{1} {\left( {{C_{2} } \mathord{\left/ {\vphantom {{C_{2} } {C_{1} }}} \right. \kern-\nulldelimiterspace} {C_{1} }} \right)}^{\gamma } .\)
Results
Intrapatient studies proved to be preferable to interpatient ones, and a 2-deoxy-2-[F-18]fluoro-d-glucose (FDG)-PET survey with analyses for γ yielded the following result: usually the γ values of tumors and brain tissues were near −1, whereas those of other noncerebral tissues were near 0. Regarding correcting uptakes for C, instead of a universally assumed and applied γ = −1, corrections should be for a single tissue using its known γ. An advantageous use of γ is predicting how C affects image contrast, including where glucose loading is sometimes preferable to fasting.
Conclusions
A potentially useful quantifier of uptake sensitivity to plasma glucose has been defined and values obtained. Correcting uptakes to some standard C requires special care. γ can help PET clinicians select fasting or loading to achieve glucose levels for optimum contrast.
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Thie, J.A., Smith, G.T. & Hubner, K.F. 2-Deoxy-2-[F-18]fluoro-d-glucose-Positron Emission Tomography Sensitivity to Serum Glucose: A Survey and Diagnostic Applications. Mol Imaging Biol 7, 361–368 (2005). https://doi.org/10.1007/s11307-005-0018-z
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DOI: https://doi.org/10.1007/s11307-005-0018-z