Abstract
BackgroundPositron emission tomography (PET) with 18F-fluorodeoxyglucose (FDG) is now a routine procedure for the management of cancer patients. Intravenous administration of FDG is sometimes halted due to troubles. In such cases, estimations of the FDG dosage injected prior to halting administration may be helpful. We have established a method of estimating the activity of FDG to patients on the basis of the dose equivalent rate on the surface of the right temporal region of the head. The correlation of actual administered dosage with independent variables, such as the dose equivalent rate on the right temporal region of the head, age, sex, and body weight, was analyzed using multiple regression analysis to obtain linear, quadratic, and cubic regression equations.ResultsWhen entering independent variables, the cubic regression equation could be used to estimate an administered dosage with an accuracy of ±10 % for 62 % of all patients and ±20 % for 90 % of all patients.ConclusionsWe conclude that this method is useful for estimating the administered dosage from the dose equivalent rate on the temporal region of the head.
Highlights
Positron emission tomography (PET) with 18F-fluorodeoxyglucose (FDG) is a routine procedure for the management of cancer patients
The aim of this study was to establish a method for estimating the administered dosage based on variables including, dose equivalent rate on the right temporal region of the head, age, sex, body weight, height, elapsed time from administration, and blood sugar using multiple regression analysis
Test of normality There were no significant differences in DER/administered dosage (DER/AD) among the nurses
Summary
Positron emission tomography (PET) with 18F-fluorodeoxyglucose (FDG) is a routine procedure for the management of cancer patients. We have established a method of estimating the activity of FDG to patients on the basis of the dose equivalent rate on the surface of the right temporal region of the head. Intravenous administration of FDG is sometimes halted due to extravasation of FDG, pain, or malfunction of injection devices In such cases, estimations of the FDG dosage injected prior to halting administration may be helpful in making a decision on how to proceed, whether to perform venipuncture at a different site to inject additional FDG or to estimate the eventual influence of underdosing on standardized uptake values (SUVs) and image quality [4,5,6]. The aim of this study was to establish a method for estimating the administered dosage based on variables including, dose equivalent rate on the right temporal region of the head, age, sex, body weight (weight), height, elapsed time from administration, and blood sugar using multiple regression analysis
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