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Objective evaluation of the visibility of colorectal lesions using eye tracking

Kana Kumahara, Hiroaki Ikematsu, Kensuke Shinmura, Tatsuro Murano, Atsushi Inaba, Kei Okumura, Keiichiro Nishihara, Hironori Sunakawa, Yasuaki Furue, Renma Ito, Daiki Sato, Tatsunori Minamide, Naoki Okamoto, Yoichi Yamamoto, Masayuki Suyama, Kenji Takashima, Keiichiro Nakajo, Yusuke Yoda, Keisuke Hori, Yasuhiro Oono, Tomonori Yano
Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society 2019 March 14

BACKGROUND AND AIM: To assess the visibility of colorectal lesions using blue laser imaging (BLI)-bright and linked-color imaging (LCI) with an eye-tracking system.

METHODS: Eleven endoscopists evaluated 90 images of 30 colorectal lesions. The lesions were randomly selected. Three images of each lesion comprised white light imaging (WLI), BLI-bright, and LCI in the same position. Participants gazed at the images, and their eye movements were tracked by the eye tracker. We analyzed whether the participants could detect the lesion and how long they took to detect the lesion. We assessed the miss rate and detection time among the imaging modalities.

RESULTS: One endoscopist was excluded, and 10 endoscopists were assessed. Overall, 12.6% of lesions were missed with WLI, 6.0% with BLI-bright, and 4.3% with LCI; the miss rate of BLI-bright and LCI was significantly lower than that of WLI (P < 0.01), with no significant difference between the former modalities (P = 0.54). Mean (± SD) detection times were 1.58 ± 1.60 s for WLI, 1.01 ± 1.21 s for BLI-bright, and 1.10 ± 1.16 s for LCI. Detection time for BLI-bright and LCI was significantly shorter than that for WLI (P < 0.0001), with no significant difference between the former modalities (P = 0.34). Regarding the miss rate and detection time between the expert and the non-experts, there was a significant difference with WLI but not with BLI-bright and LCI.

CONCLUSION: Blue laser imaging-bright and LCI improved the detection of colorectal lesions compared with WLI using an eye-tracking system.


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