title: A study to standardize quantitative evaluation of parotid gland scintigraphy in patients with Sjögren's syndrome.
abstract: OBJECTIVE
  To standardize quantitative parotid gland scintigraphy for diagnosing Sjögren's syndrome (SS).
  
  
  METHODS
  Forty-five patients with SS and 23 controls were studied. Dynamic images were obtained up to 50 min after the injection of 185 MBq 99mTc-pertechnetate and salivary excretion was stimulated with lemon juice orally at 40 min after the injection. Peak count and uptake speed in the uptake phase, and excretion speed and excretion fraction in the excretion phase were calculated.
  
  
  RESULTS
  The levels of peak count, uptake speed, and excretion speed in the patients with SS were significantly lower than the levels in the controls, whereas there was no significant difference of excretion fraction level between the patients with SS and the controls. The calculations of peak count and excretion speed levels, which were closely related with the focus scores of minor salivary glands and the amount of stimulated whole saliva, showed higher reproducibility, sensitivity, and specificity than those of uptake speed and excretion fraction levels.
  
  
  CONCLUSIONS
  The calculations of peak count and excretion speed were eligible to standardize quantitative parotid gland scintigraphy for diagnosing SS.
authors.affiliation: Rheumatic Disease Center, Kurashiki Medical Center, Kurashiki, Japan. susumu.nisiyama@ryumachi-jp.com
authors.forename: Susumu
authors.initials: S
authors.lastname: Nishiyama
authors.forename: Shoji
authors.initials: S
authors.lastname: Miyawaki
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Yoshinaga
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010306:Parotid Gland / Q000000981:diagnostic imaging* / Q000378:metabolism; D011877:Radionuclide Imaging / Q000379:methods* / Q000592:standards; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics; D015203:Reproducibility of Results; D012219:Rheumatology / Q000379:methods* / Q000592:standards; D012680:Sensitivity and Specificity; D012859:Sjogren's Syndrome / Q000000981:diagnostic imaging* / Q000378:metabolism; D013670:Sodium Pertechnetate Tc 99m / Q000493:pharmacokinetics; D013997:Time Factors
chemical_list: D019275:Radiopharmaceuticals; D013670:Sodium Pertechnetate Tc 99m