Final published version
Research output: Contribution to Journal/Magazine › Conference article › peer-review
Research output: Contribution to Journal/Magazine › Conference article › peer-review
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TY - JOUR
T1 - An eye-tracking AFROC study of the influence of experience and training on chest X-ray interpretation
AU - Manning, David
AU - Ethell, Susan
AU - Crawford, Trevor
PY - 2003/9/12
Y1 - 2003/9/12
N2 - Four observer groups with different levels of expertise were tested in an investigation into the comparative nature of expert performance. The radiological task was the detection and localisation of significant pulmonary nodules in postero-anterior views of the chest in adults. Three test banks of 40 images were used. The observer groups were 6 experienced radiologists, 6 experienced radiographers prior to a six month training programme in chest image interpretation, the same radiographers after their training programme, and 6 fresher undergraduate radiography students. Eye tracking was carried out on all observers to demonstrate differences in visual activity and nodule detection performance was measured with an AFROC technique. Detection performances of the four groups showed the radiologists and radiographers after training were measurably superior at the task. The eye-tracking parameters saccadic length, number of fixations visual coverage and scrutiny time per film were measured for all subjects and compared. The missed nodules fixated and not fixated were also determined for the radiologist group. Results have shown distinct stylistic differences in the visual scanning strategies between the experienced and inexperienced observers that we believe can be generalised into a description of characteristics of expert versus non-expert performance. The findings will be used in the educational programme of image interpretation for non-radiology practitioners.
AB - Four observer groups with different levels of expertise were tested in an investigation into the comparative nature of expert performance. The radiological task was the detection and localisation of significant pulmonary nodules in postero-anterior views of the chest in adults. Three test banks of 40 images were used. The observer groups were 6 experienced radiologists, 6 experienced radiographers prior to a six month training programme in chest image interpretation, the same radiographers after their training programme, and 6 fresher undergraduate radiography students. Eye tracking was carried out on all observers to demonstrate differences in visual activity and nodule detection performance was measured with an AFROC technique. Detection performances of the four groups showed the radiologists and radiographers after training were measurably superior at the task. The eye-tracking parameters saccadic length, number of fixations visual coverage and scrutiny time per film were measured for all subjects and compared. The missed nodules fixated and not fixated were also determined for the radiologist group. Results have shown distinct stylistic differences in the visual scanning strategies between the experienced and inexperienced observers that we believe can be generalised into a description of characteristics of expert versus non-expert performance. The findings will be used in the educational programme of image interpretation for non-radiology practitioners.
KW - AFROC
KW - Error
KW - Expert performance
KW - Eye-tracking
KW - Fixation patterns
KW - Pulmonary nodules
U2 - 10.1117/12.479985
DO - 10.1117/12.479985
M3 - Conference article
AN - SCOPUS:0042358956
VL - 5034
SP - 257
EP - 266
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
SN - 0277-786X
T2 - Medical Imaging 2003: Image Perception, Observer Performance, and Technology Assessment
Y2 - 18 February 2003 through 20 February 2003
ER -