Impact of reversible trapping of tracer and the presence of blood metabolites on measurements of myocardial glucose utilization performed by PET and 18F-fluorodeoxyglucose using the Patlak method.
In this study we demonstrated that significant egress of FDG from myocardium occurs within the first hour after tracer injection leading to nonlinear Patlak plots. There are also significant amounts of acidic FDG metabolites present in the blood. However, the impact of these metabolites on the estimates of myocardial glucose utilization (MGU) is negligible. Although further studies will be required to elucidate the reason for the egress of tracer from myocardium, not accounting for it will result in erroneous estimates of MGU.
Division of Radiological Sciences, Edward Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA. HerreroP@mir.wustl.edu
Pilar
P
Herrero
Carmen S
CS
Dence
Terry L
TL
Sharp
Michael J
MJ
Welch
Robert J
RJ
Gropler
D000465:Algorithms; D000818:Animals; D001786:Blood Glucose / Q000032:analysis; D004285:Dogs; D019788:Fluorodeoxyglucose F18 / Q000097:blood / Q000493:pharmacokinetics*; D005947:Glucose / Q000378:metabolism*; D006321:Heart / Q000000981:diagnostic imaging*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008657:Metabolic Clearance Rate; D009206:Myocardium / Q000378:metabolism*; D049268:Positron-Emission Tomography / Q000379:methods*; D019275:Radiopharmaceuticals / Q000097:blood / Q000493:pharmacokinetics; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D001786:Blood Glucose; D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18; D005947:Glucose