title: The appropriate whole-body index on which to base standardized uptake value in 2-deoxy-2-[(18)F]fludeoxyglucose PET.
abstract: OBJECTIVE
  Tissue uptake of 2-deoxy-2-fluorine-18 fludeoxyglucose ((18)F-FDG) is routinely quantified as standardized uptake value (SUV), which in general is the fraction (F) of administered activity per millilitre of tissue multiplied by an index of body size, usually weight (W), i.e. F/ml × W = SUV or F/ml = SUV × (1/W). Other indices have been suggested as preferable to W, especially lean body mass (LBM) and body surface area (BSA). The second equation mentioned above shows that the reciprocal of the ideal index should correlate closely with F/ml and give a regression line through the origin. The purpose of this study was to determine which of these three indices best meets these criteria.
  
  
  METHODS
  Data were evaluated from 49 males and 51 females undergoing routine (18)F-FDG positron emission tomography/CT. A 3 cm diameter region of interest was drawn over the liver and F/ml recorded. LBM and BSA were estimated from height and weight.
  
  
  RESULTS
  Based on all patients, the reciprocals of the three indices gave similar correlation coefficients with F/ml, but only 1/LBM gave regressions close to the origin. Intercepts were significantly higher for females for 1/W and 1/BSA, consistent with females having more body fat, but there was no significant difference with 1/LBM.
  
  
  CONCLUSIONS
  LBM is the best index on which to base SUV because adipose tissue accumulates less (18)F-FDG than other soft tissues.
  
  
  CONCLUSIONS
  The value of this study lies in its use of a novel, more rational approach than previously to confirm that SUV should be based on LBM.
authors.affiliation: 1 Clinical Imaging Sciences Centre, Brighton Sussex Medical School, University of Sussex, Brighton, UK.|2 Department of Nuclear Medicine, Brighton Sussex University Hospitals NHS Trust, Brighton, UK.
authors.forename: G
authors.initials: G
authors.lastname: Keramida
authors.affiliation: 1 Clinical Imaging Sciences Centre, Brighton Sussex Medical School, University of Sussex, Brighton, UK.
authors.forename: J
authors.initials: J
authors.lastname: Hunter
authors.affiliation: 1 Clinical Imaging Sciences Centre, Brighton Sussex Medical School, University of Sussex, Brighton, UK.|2 Department of Nuclear Medicine, Brighton Sussex University Hospitals NHS Trust, Brighton, UK.
authors.forename: S
authors.initials: S
authors.lastname: Dizdarevic
authors.affiliation: 2 Department of Nuclear Medicine, Brighton Sussex University Hospitals NHS Trust, Brighton, UK.
authors.forename: A M
authors.initials: AM
authors.lastname: Peters
mesh_terms: D001837:Body Weights and Measures; D005260:Female; D019788:Fluorodeoxyglucose F18 / Q000493:pharmacokinetics*; D006801:Humans; D008297:Male; D008433:Mathematics; D049268:Positron-Emission Tomography / Q000592:standards*; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics*; D012189:Retrospective Studies
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18