Background and aims: Polyp miss-rate is a drawback of colonoscopy that increases significantly for small
polyps. We explored the efficacy of an automatic computer-vision method for polyp
detection.
Methods: Our method relies on a model that defines polyp boundaries as valleys of image intensity.
Valley information is integrated into energy maps that represent the likelihood of
the presence of a polyp.
Results: In 24 videos containing polyps from routine colonoscopies, all polyps were detected
in at least one frame. The mean of the maximum values on the energy map was higher
for frames with polyps than without (P < 0.001). Performance improved in high quality frames (AUC = 0.79 [95 %CI 0.70 – 0.87]
vs. 0.75 [95 %CI 0.66 – 0.83]). With 3.75 set as the maximum threshold value, sensitivity
and specificity for the detection of polyps were 70.4 % (95 %CI 60.3 % – 80.8 %) and
72.4 % (95 %CI 61.6 % – 84.6 %), respectively.
Conclusion: Energy maps performed well for colonic polyp detection, indicating their potential
applicability in clinical practice.
