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Performance changes in lung nodule detection following perceptual feedback of eye movements.

Donovan, T. and Manning, D.J. and Crawford, Trevor J. (2008) Performance changes in lung nodule detection following perceptual feedback of eye movements. In: Medical Imaging 2008: Image Perception, Observer Performance, and Technology Assessment. Proceedings of the SPIE (6917). SPIE, USA, p. 691703.

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Abstract

In a previously reported study we demonstrated that expert performance can decline following perceptual feedback of eye movements in the relatively simple radiological task of wrist fracture detection [1]. This study was carried out to determine if the same effect could be observed using a more complicated radiological task of identifying lung nodules on chest radiographs. Four groups (n=10 in each group) of observers with different levels of expertise were tested. The groups were naïve observers, level 1 radiography students, level 2 radiography students and experts. Feedback was presented to the observers in the form of their scan paths and fixations. Half the observers had feedback and half had no perceptual feedback. JAFROC analysis was used to measure observer performance. A repeated measures ANOVA was carried out. There was no significant effect between the pre and post “no feedback” condition. There was a significant difference between the pre and post “feedback” condition with a significant improvement following feedback (F(1,16)=6.6,p = 0.021). Overall the mean percentage improvement was small of 3.3%, with most of the improvement due to the level 1 group where the percentage increase in the figure of merit (FOM) was 8.4% and this was significant (p<0.05). Eye tracking metrics indicate that the expert and naïve observers were less affected by feedback or a second look whereas there were mixed results between the level 1 and level 2 students possibly reflecting the different search strategies used. Perceptual feedback may be beneficial for those early in their training.

Item Type: Contribution in Book/Report/Proceedings
Uncontrolled Keywords: perceptual feedback ; expertise ; eye-tracking ; lung nodule detection
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Departments: Faculty of Science and Technology > Psychology
ID Code: 11149
Deposited By: Dr Trevor Crawford
Deposited On: 04 Aug 2008 09:05
Refereed?: No
Published?: Published
Last Modified: 30 Sep 2013 15:20
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/11149

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