title: Measuring thyroid gland volume: should we change the correction factor?
abstract: OBJECTIVE
  In the assessment of thyroid volume with sonography (formula of an ellipsoid), a correction factor is used. Whereas previously 0.524 was used, the World Health Organization has recently changed (after the first review) this correction factor to 0.479. We compare volume measurement of the thyroid using different correction factors to automated volume measurement using MDCT, and we define an optimal correction factor in thyroid volume assessment.
  
  
  CONCLUSIONS
  Acceptable correction factors are situated in the range of 0.494-0.554. We propose a correction factor of 0.529 when using the ellipsoid formula.
authors.affiliation: Department of Radiology, AZ-Vrije Universiteit Brussels, Brussels, Belgium.
authors.forename: Wael
authors.initials: W
authors.lastname: Shabana
authors.forename: Els
authors.initials: E
authors.lastname: Peeters
authors.forename: Michel
authors.initials: M
authors.lastname: De Maeseneer
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D013961:Thyroid Gland / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed