Table II.

Sørensen‐Dice similarity coefficients (in percentage), mean surface distance (in cm), and Hausdorff distance (in cm) between our CNN‐based model and clinical contours from 140 internal test CT scans.

Structure	DSC (mean ± SD)	MSD (mean ± SD)	Hausdorff Distance (mean ± SD)
Primary CTV	0.86 ± 0.08	0.19 ± 0.12	2.02 ± 1.17
Nodal CTV	0.81 ± 0.03	0.21 ± 0.05	2.09 ± 0.56
PAN CTV	0.76 ± 0.09	0.27 ± 0.16	2.00 ± 1.00
Bladder	0.89 ± 0.09	0.11 ± 0.13	1.07 ± 0.89
Rectum	0.81 ± 0.09	0.18 ± 0.14	1.66 ± 1.17
Spinal cord	0.90 ± 0.02	0.06 ± 0.01	0.65 ± 0.18
Femur, left	0.94 ± 0.03	0.06 ± 0.03	0.60 ± 0.41
Femur, right	0.93 ± 0.04	0.07 ± 0.04	0.66 ± 0.43
Kidney, left	0.94 ± 0.02	0.08 ± 0.03	0.76 ± 0.28
Kidney, right	0.95 ± 0.02	0.07 ± 0.03	0.84 ± 0.37
Pelvic bone	0.93 ± 0.02	0.05 ± 0.02	1.06 ± 0.53
Sacrum	0.91 ± 0.02	0.07 ± 0.05	1.25 ± 1.12
L4 vertebral body	0.91 ± 0.15	0.07 ± 0.15	0.53 ± 0.36
L5 vertebral body	0.90 ± 0.15	0.08 ± 0.23	0.68 ± 0.81

CNN: convolutional neural network; CT: computed tomography; DSC: Sørensen‐Dice similarity coefficient; MSD: mean surface distance; SD: standard deviation.