Introduction
Materials and methods
Tracking system
Calibration
Computer vision-based algorithm
Evaluation of the quantitative method
Sensitivity of the polyp size measurements
The impact of endoscope movements
Movements type | Description |
---|---|
0 | Movements with displacement less than 3 mm |
1 | Movements without changing the depth (less than 2 mm) with rotation less than 20 degrees |
2 | Movements without changing the depth (less than 2 mm) with rotation larger than 20 degrees |
3 | Movements with changing the depth with small rotation (less than 5 degrees) |
4 | Movements with changing the depth with rotation between 5 and 20 degrees |
5 | Movements with changing the depth with rotation larger than 20 degrees |
The impact of distance from the electromagnetic source
The impact of depth
The segmentation quality impact
Accuracy of the polyp size and location measurement
Result
Tracking system
Sensitivity of the polyp size measurements
Accuracy of the polyp size and location measurement
Quality of automated segmentation (DSC) | > 0.9 |
Depth [mm] | [22.5 57.5] |
Type of movements | 1(95%) and 4(5%) |
Distance from the electromagnetic source [cm] | 31.22 ± 0.3 |
Metrics | Approach A | Approach B | ||
---|---|---|---|---|
Polyp size in diameter | Polyp distance with respect to the Z line | Polyp size in diameter | Polyp distance with respect to the Z line | |
Mean [mm] | 10.86 | 224.85 | 10.93 | 225.03 |
SD [mm] | 0.38 | 2.18 | 0.16 | 1.63 |
The absolute difference between the mean and actual size[mm] | 0.86 | 1.28 | 0.93 | 1.46 |
RMSE [mm] | 0.947 | 2.53 | 0.946 | 2.19 |
Coefficient of variation [%] | 3.5 | 0.97 | 1.46 | 0.72 |
Mean percentage of the error [%] | 8.65 ± 3.8 | 0.81 ± 0.79 | 9.32 ± 1.64 | 0.87 ± 0.59 |