title: Reproducibility of semi-quantitative parameters in FDG-PET using two different PET scanners: influence of attenuation correction method and examination interval.
abstract: OBJECTIVE
  The aim of this study is to evaluate the reproducibility of semi-quantitative parameters obtained from two 2-deoxy-2-[F-18]fluoro-D-glucose-positron emission tomography (FDG-PET) studies using two different PET scanners.
  
  
  METHODS
  Forty-five patients underwent FDG-PET examination with two different PET scanners on separate days. Two PET images with different attenuation correction method were generated in each patient, and three regions of interest (ROIs) were placed on the lung tumor and normal organs (mediastinum and liver) in each image. Mean and maximum standardized uptake values (SUVs), tumor-to-mediastinum and tumor-to-liver ratios (T/M and T/L), and the percentage difference in parameters between two PET images (% Diff.) were compared.
  
  
  RESULTS
  All measured values except maximum SUV in the liver and tumor-related parameters (SUV in lung tumor, T/M, T/L) showed no significant difference between two PET images.
  
  
  CONCLUSIONS
  The mean measured values showed high reproducibility and demonstrate that follow-up study or measurement of tumor response to anticancer drugs can be undertaken by FDG-PET examination without specifying the particular type of PET scanner.
authors.affiliation: Department of Radiology, Faculty of Medical Sciences, University of Fukui, Fukui, Fukui Prefecture, Japan.
authors.forename: Tomohito
authors.initials: T
authors.lastname: Kamibayashi
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Tsuchida
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Demura
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Tsujikawa
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Okazawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Kudoh
authors.forename: Hirohiko
authors.initials: H
authors.lastname: Kimura
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D049268:Positron-Emission Tomography / Q000295:instrumentation* / Q000379:methods*; D015203:Reproducibility of Results
chemical_list: D019788:Fluorodeoxyglucose F18