Table 2. Quantitative segmentation results of improved DenseUnet and the compared models for 3 structures in the testing set.
| Models | LAM | EAS | IOM | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| DSC (95% CI) | HD (95% CI) | ASSD (95% CI) | DSC (95% CI) | HD (95% CI) | ASSD (95% CI) | DSC (95% CI) | HD (95% CI) | ASSD (95% CI) | |||
| Unet | 0.749±0.164 (0.731, 0.768) | 22.993±22.266 (20.415, 25.571) | 3.732±5.190 (3.132, 4.333) | 0.717±0.172 (0.696, 0.738) | 22.295±34.542 (18.051, 26.538) | 4.129±7.736 (3.179, 5.079) | 0.809±0.140 (0.795, 0.823) | 35.996±47.235 (31.238, 40.755) | 4.989±10.907 (3.890, 6.088) | ||
| Unet++ | 0.749±0.169 (0.729, 0.769) | 23.874±26.245 (20.835, 26.912) | 4.719±12.926 (3.223, 6.216) | 0.708±0.170 (0.688, 0.729) | 17.817±13.361 (16.176, 19.458) | 3.399±2.869 (3.046, 3.751) | 0.807±0.137 (0.794, 0.821) | 37.698±48.430 (32.820, 42.577) | 5.223±10.223 (4.194, 6.253) | ||
| ResUnet | 0.753±0.162 (0.734, 0.771) | 22.884±22.311 (20.301, 25.467) | 3.593±4.813 (3.036, 4.150) | 0.729±0.169 (0.708, 0.750) | 18.015±26.890 (14.712, 21.319) | 3.092±2.990 (2.725, 3.459) | 0.807±0.152 (0.792, 0.823) | 38.770±52.676 (33.464, 44.076) | 5.798±12.988 (4.490, 7.107) | ||
| DenseUnet | 0.756±0.161 (0.737, 0.774) | 23.953±30.851 (20.381, 27.525) | 3.810±5.645 (3.156, 4.463) | 0.710±0.177 (0.688, 0.732) | 18.095±13.972 (16.378, 19.811) | 3.721±4.552 (3.162, 4.280) | 0.806±0.153 (0.790, 0.821) | 38.939±53.018 (33.598, 44.279) | 5.631±11.807 (4.441, 6.820) | ||
| DenseUnet† | 0.758±0.151 (0.741, 0.775) | 22.410±24.342 (19.592, 25.229) | 3.661±5.308 (3.047, 4.276) | 0.716±0.173 (0.695, 0.738) | 19.003±26.068 (15.801, 22.205) | 3.803±7.004 (2.942, 4.663) | 0.810±0.147 (0.795, 0.825) | 36.009±47.494 (31.225, 40.793) | 5.226±12.210 (3.996, 6.456) | ||
All values are described as means ± standard deviations. Numbers in parentheses are the confidence intervals. The units of HD and ASSD are in millimeters. †, denotes the improved DenseUet. LAM, levator ani muscle; EAS, external anal sphincter; IOM, internal obturator muscle; DSC, Dice similarity coefficient; CI, confidence interval; HD, Hausdorff distance; ASSD, average symmetrical surface distance.