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Proceedings Paper

Frequency analysis of gaze points with CT colonography interpretation using eye gaze tracking system
Author(s): Shoko Tsutsumi; Wataru Tamashiro; Mitsuru Sato; Mika Okajima; Toshihiro Ogura; Kunio Doi
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Paper Abstract

It is important to investigate eye tracking gaze points of experts, in order to assist trainees in understanding of image interpretation process. We investigated gaze points of CT colonography (CTC) interpretation process, and analyzed the difference in gaze points between experts and trainees. In this study, we attempted to understand how trainees can be improved to a level achieved by experts in viewing of CTC. We used an eye gaze point sensing system, Gazefineder (JVCKENWOOD Corporation, Tokyo, Japan), which can detect pupil point and corneal reflection point by the dark pupil eye tracking. This system can provide gaze points images and excel file data. The subjects are radiological technologists who are experienced, and inexperienced in reading CTC. We performed observer studies in reading virtual pathology images and examined observer’s image interpretation process using gaze points data. Furthermore, we examined eye tracking frequency analysis by using the Fast Fourier Transform (FFT). We were able to understand the difference in gaze points between experts and trainees by use of the frequency analysis. The result of the trainee had a large amount of both high-frequency components and low-frequency components. In contrast, both components by the expert were relatively low. Regarding the amount of eye movement in every 0.02 second we found that the expert tended to interpret images slowly and calmly. On the other hand, the trainee was moving eyes quickly and also looking for wide areas. We can assess the difference in the gaze points on CTC between experts and trainees by use of the eye gaze point sensing system and based on the frequency analysis. The potential improvements in CTC interpretation for trainees can be evaluated by using gaze points data.

Paper Details

Date Published: 1 March 2017
PDF: 6 pages
Proc. SPIE 10140, Medical Imaging 2017: Digital Pathology, 1014011 (1 March 2017); doi: 10.1117/12.2250010
Show Author Affiliations
Shoko Tsutsumi, Gunma Prefectural College of Health Sciences (Japan)
Wataru Tamashiro, Gunma Prefectural College of Health Sciences (Japan)
Mitsuru Sato, Gunma Prefectural College of Health Sciences (Japan)
Japanese Red Cross Maebashi Hospital (Japan)
Mika Okajima, Japanese Red Cross Maebashi Hospital (Japan)
Toshihiro Ogura, Gunma Prefectural College of Health Science (Japan)
Kunio Doi, Univ. of Chicago (United States)

Published in SPIE Proceedings Vol. 10140:
Medical Imaging 2017: Digital Pathology
Metin N. Gurcan; John E. Tomaszewski, Editor(s)

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