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Intra- and interobserver variation in CT-evaluated cerebral atrophy.

T Skjødt1, H G Teisen, K F Torfing

  • 1Department of Diagnostic Radiology, Odense University Hospital, Denmark.

Rofo : Fortschritte Auf Dem Gebiete Der Rontgenstrahlen Und Der Nuklearmedizin
|December 1, 1988
PubMed
Summary

Radiologists showed significant variation when visually grading patient atrophy on CT scans. Using referential scans reduced, but did not eliminate, this inter- and intraobserver variability, questioning visual estimation reliability.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Neuroradiology

Background:

  • Assessing brain atrophy is crucial for diagnosing and monitoring neurological conditions.
  • Visual grading of atrophy on CT scans is a common but potentially subjective method.

Purpose of the Study:

  • To determine the inter- and intraobserver variation in visual grading of internal and external atrophy.
  • To evaluate the effect of referential scans on reducing this variation.

Main Methods:

  • Four radiologists visually graded atrophy in 94 patients' CT scans into four grades.
  • Scans were evaluated three times; the third evaluation incorporated referential scans.
  • Inter- and intraobserver variation was assessed before and after using referential scans.

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Main Results:

  • Considerable inter- and intraobserver variation was observed in the initial evaluations.
  • Using referential scans reduced the variation to two consecutive grades.
  • Despite reduction, significant variability persisted.

Conclusions:

  • Visual estimation of atrophy on CT scans exhibits considerable inter- and intraobserver variability.
  • Referential scans can mitigate but not fully resolve this variability.
  • Visual grading of atrophy is unreliable when precise estimation is critical.