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A 3D Digital Model for the Diagnosis and Treatment of Pulmonary Nodules
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Do long radiology workdays affect nodule detection in dynamic CT interpretation?

Elizabeth A Krupinski1, Kevin S Berbaum, Robert T Caldwell

  • 1Department of Radiology, University of Arizona, Tucson, AZ 85724, USA. krupinski@radiology.arizona.edu

Journal of the American College of Radiology : JACR
|March 6, 2012
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Summary
This summary is machine-generated.

Radiologist fatigue after a workday significantly reduces diagnostic accuracy for detecting pulmonary nodules on computed tomography (CT) scans, despite unchanged search times. Increased visual strain and fatigue levels were observed.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Human Factors in Medicine

Background:

  • Previous research indicated fatigue impairs fracture detection on static skeletal radiographs.
  • Static image display is common in skeletal radiography, contrasting with dynamic CT sequences.

Purpose of the Study:

  • To assess if radiologist fatigue affects diagnostic accuracy for pulmonary nodules on dynamic CT chest scans.
  • To investigate the impact of a workday on visual strain and diagnostic performance in radiologists.

Main Methods:

  • Twenty-two radiologists and 22 residents performed two tests on CT chest sequences before and after a clinical reading day.
  • Diagnostic accuracy was measured using receiver operating characteristic analysis on CT scans with and without nodules.
  • Visual strain was quantified using dark vergence, an objective measure of eye focus ability.

Main Results:

  • Diagnostic accuracy for pulmonary nodule detection decreased significantly after a workday (P = .0246).
  • Search time for nodules remained unaffected by fatigue (P > .05).
  • Increased visual strain (larger, more variable dark vergence; P = .0098) and subjective fatigue were reported.

Conclusions:

  • Radiologists exhibit reduced diagnostic accuracy and increased fatigue after a typical workday.
  • Active interaction with the display may help mitigate the negative effects of fatigue on CT interpretation.