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[Thyroid ultrasonography. Interobserver and intraobserver variations].

Carmen Vulpoi1, Voichiţa Mogoş, Delia Gabriela Ciobanu

  • 1Departamentul de Endocrinologie, Facultatea de Medicină, Universitatea de Medicină si Farmacie "Gr.T. Popa", Iaşi.

Revista Medico-Chirurgicala a Societatii De Medici Si Naturalisti Din Iasi
|April 9, 2008
PubMed
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Interobserver variation in thyroid volume measurements can be significant in children, potentially explaining differing goitre prevalence data. Standardizing ultrasound techniques and using consistent observers is crucial for reliable results.

Area of Science:

  • Pediatric endocrinology
  • Diagnostic imaging
  • Public health

Background:

  • Thyroid ultrasonography is vital for assessing goitre prevalence and iodine status in children.
  • Existing normal thyroid volume limits (WHO/ICCIDD) are debated due to findings of smaller volumes in some studies.
  • Variability in measurement techniques can impact thyroid volume estimations.

Purpose of the Study:

  • To evaluate the impact of inter-observer and intra-observer variability on pediatric thyroid volume determination.
  • To understand how observer differences affect the accuracy of thyroid volume measurements in children.

Main Methods:

  • Thyroid volume was calculated using the rotating ellipsoid formula in 30 children.
  • Three independent observers performed the measurements.

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  • One observer repeated measurements on 25 children to assess intra-observer variability.

    • Main Results:

    • Mean inter-observer variations reached 9.51% +/- 8.8%, with notable differences between specific observers.
    • Differences in measured diameters ranged from 12-16%, particularly for the longitudinal dimension.
    • Intra-observer differences were smaller, averaging 6.29% +/- 6.12%.

    Conclusions:

    • Significant inter-observer variation can contribute to discrepancies in pediatric thyroid volume data.
    • While present, intra-observer differences were less pronounced.
    • Establishing standardized ultrasound protocols and using consistent observers are recommended for comparable pediatric thyroid volume data.