Table 1.

The comparison between our ML-based model, the two cropped expansions and Ground-truth CTV on all testing samples. The values of the overlapping volume, OV, with OARs were calculated only when the OARs are within the 8 mm vicinity of the corresponding iGTVs. The CTV volumes were summarized as the mean value with minimum and maximum values over all testing datasets.

	ML-predicted CTV	Ground truth CTV	Cropped 5 mm expansion CTV	Cropped 8 mm expansion CTV
DSC	$0.86\pm 0.03$	N.A.	$0.81\pm 0.10$	$0.83\pm 0.04$
Precision	$0.89\pm 0.04$	N.A.	$0.86\pm 0.10$	$0.76\pm 0.06$
Recall	$0.84\pm 0.05$	N.A.	$0.77\pm 0.10$	$0.92\pm 0.04$
Median surface distance [mm]	1.0	N.A.	1.0	$2.0$
Hausdorff surface distance [mm]	8.6	N.A.	$9.1$	$12.6$
95% surface distance [mm]	3.9	N.A.	$4.5$	$6.1$
*OV with the esophagus [cm3]	$0.4\pm 0.3$	$0.1\pm 0.2$	$0.0\pm 0.0$	$0.0\pm 0.0$
*OV with the heart [cm3]	$1.2\pm 0.6$	$0.8\pm 0.6$	$0.0\pm 0.0$	$0.0\pm 0.0$
**CTV Volume [cm3]	95.2 [31.7, 290.2]	101.1 [27.5, 314.0]	88.0 [17.2, 282.0]	120.6 [44.1, 356.4]
Contouring Time	3.8~4.0 s	5~20 min	5~20 min	5~20 min