Colometer: A real-time quality feedback system for screening colonoscopy

Figure 1 Conceptual block diagram of the proposed colometer system.

Figure 2 Relative withdrawal speed over time. Red line is the speed threshold configured by the endoscopists.

Figure 3 A sample frame with focused (left) and poor image clarity. Text indicators “adequate speed”, “rapid withdrawal”, “blurry”, were embedded into the video in a real-time to provide a visual feedback to the endoscopist.

Figure 4 An automatically generated chart providing % of time of adequate speed in a colonoscopy procedure (left) and chart showing filtered velocity over time (right).

Figure 5 Comparative results (withdrawal vs insertion) for 10 colonoscopy procedures. The output mean values are marked with a cross.

Figure 6 Correlation between the overall quality ratings from the Colometer system. A: Mean endoscopist overall quality rating (ρ = 0.65, P < 0.01); B: Mean endoscopist withdrawal speed rating (ρ = 0.59, P < 0.01); C: Mean endoscopist image quality rating (ρ = 0.41, P = 0.15).