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Objective Assessment of Visibility of Colorectal Lesions Using Eye Tracking for New Image-Enhanced Endoscopy
Aiji Hattori1,2, Hiroaki Ikematsu1,3, Hiroki Yamashita1
1Department of Gastroenterology and Endoscopy, National Cancer Center Hospital East, Chiba, Japan.
Background And Aim:
This study aimed to objectively evaluate colorectal lesion visibility using white-light imaging (WLI), narrow-band imaging (NBI), and texture and color enhancement imaging (TXI) with an eye tracking system.
Methods:
Twelve endoscopists assessed 120 images of 30 colorectal lesions (29 adenomas, one sessile serrated lesion) captured using WLI, NBI, TXI mode-1, and TXI mode-2. Eye movements were recorded to analyze the lesion detection ability and time taken. The miss rate (calculated as the ratio of missed lesions from 360 images) and detection time (defined as the time from displaying the image to the start of gaze on lesions) were compared among the four modalities.
Results:
The miss rates of WLI, NBI, TXI mode-1, and TXI mode-2 were 16.4%, 6.4%, 11.7%, and 16.7%, respectively. The miss rate of NBI was significantly lower than those of WLI and TXI mode-2 (p < 0.001). The detection times (median [interquartile range]) of WLI, NBI, TXI mode-1, and TXI mode-2 were 0.71 (0.43-1.37) s, 0.54 (0.34-0.89) s, 0.63 (0.44-1.13) s, and 0.64 (0.37-1.28) s, respectively. NBI had the shortest detection time among the four modalities (p < 0.001 compared with WLI and TXI mode-2; p = 0.005 compared with TXI mode-1).
Conclusions:
Objective assessment using the eye tracking system revealed that NBI provided the best colorectal lesion visibility, with the lowest miss rate and shortest detection time.
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