PT Unknown
AU Jorge Bernal
   Fernando Vilariño
   F. Javier Sanchez
   M. Arnold
   Anarta Ghosh
   Gerard Lacey
TI Experts vs Novices: Applying Eye-tracking Methodologies in Colonoscopy Video Screening for Polyp Search
BT 2014 Symposium on Eye Tracking Research and Applications
PY 2014
BP 223
EP 226
DI 10.1145/2578153.2578189
AB We present in this paper a novel study aiming at identifying the differences in visual search patterns between physicians of diverse levels of expertise during the screening of colonoscopy videos. Physicians were clustered into two groups -experts and novices- according to the number of procedures performed, and fixations were captured by an eye-tracker device during the task of polyp search in different video sequences. These fixations were integrated into heat maps, one for each cluster. The obtained maps were validated over a ground truth consisting of a mask of the polyp, and the comparison between experts and novices was performed by using metrics such as reaction time, dwelling time and energy concentration ratio. Experimental results show a statistically significant difference between experts and novices, and the obtained maps show to be a useful tool for the characterisation of the behaviour of each group.
ER