Time-dependent observer errors in pulmonary nodule detection.

Manning, David and Barker-Mill, S. C. and Donovan, T. and Crawford, Trevor (2006) Time-dependent observer errors in pulmonary nodule detection. British Journal of Radiology, 79 (940). pp. 342-346. ISSN 1748-880X

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The work was carried out to investigate differences in visual search characteristics between groups of observers with different levels of experience in the task of pulmonary nodule detection in chest radiology and we report here on these differences in respect of time related decisions. Volunteer observers were divided into three groups depending on their level of expertise. There were eight radiologists, eight radiographers and eight novices. Their task was to detect pulmonary nodules in a test bank of 120 digitized posteroanterior (PA) chest radiographs. Five of the eight radiographers were tested twice: once before and once after a 6-month training programme in interpretation of the adult chest radiograph. During each test session the observers' eye movements were tracked. Data on the observers' decisions through Alternate Free Response Operating Characteristic (AFROC) methodology were correlated to their eye-movement and fixation patterns. True negative decisions from all observers were associated with shorter fixation times than false negative decisions. No correct negative decisions were made after fixations exceeding 3 s.

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Journal Article
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British Journal of Radiology
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04 Jun 2008 13:35
Last Modified:
05 Apr 2022 00:53