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Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns
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Reliability of radiologists' first impression when interpreting a screening mammogram.

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Area of Science:

  • Radiology and Medical Imaging
  • Human Perception and Cognition

Background:

  • Radiologists can identify abnormalities in mammograms quickly via global processing.
  • Initial impressions, or 'gist signals,' are formed rapidly from screening mammograms.

Purpose of the Study:

  • To assess the reliability of radiologists' initial 'gist signals' in mammogram interpretation.
  • To determine intra- and inter-observer reliability for these rapid impressions.
  • To identify if a subset of radiologists demonstrates superior reliability and accuracy.

Main Methods:

  • Thirty-nine radiologists provided initial impressions on mammograms twice, with each image viewed for 0.5 seconds.
  • Intra-class correlation (ICC) and weighted Cohen's Kappa were used to measure reliability.
  • Statistical tests (Mann-Whitney U) compared reliability metrics between 'Gist Experts' and other radiologists.

Main Results:

  • Intra-reader reliability was poor to moderate (median ICC not specified, median Kappa 0.478).
  • Only a minority of radiologists met minimum reliability standards (ICC ≥ 0.6).
  • Inter-reader reliability was poor (ICC 0.31, Fleiss Kappa 0.106), indicating slight agreement.

Conclusions:

  • Radiologists' initial 'gist signals' from rapid mammogram viewing are not reliably consistent.
  • The absence of an abnormal gist does not reliably indicate a normal mammogram.
  • Emphasizes the need for thorough 'discovery scanning' before concluding a visual search.