Table 1:

Segmentation accuracy (mean and standard deviation) of various methods applied to T2-w MRI. LG bowel: Large bowel, SM bowel: small bowel, Sto-Duo: stomach-duodenum.

^†: Segmentations generated for treatment fraction 4 and 5 using majority voting of segmentations produced by using 1, 2, and 3 treatment fraction MRI.

°: p < 0.05, *: p < 0.01, **: p < 0.001.

Method	DSC ↑				HD95 mm ↓
	Liver	LG Bowel	SM Bowel	Sto-Duo	Liver	LG Bowel	SM Bowel	Sto-Duo
SyN35	0.89±0.04**	0.59±0.13**	0.61±0.09**	0.66±0.08**	9.17±3.55**	20.04±8.55**	20.74±7.36**	13.08±5.08**
Voxelmorph17	0.91±0.06**	0.74±0.18**	0.67±0.10**	0.75±0.09**	7.85±3.85**	14.52±9.81**	19.26±7.97**	13.35±13.21**
Unet3D	0.92±0.02**	0.79±0.11**	0.68±0.11**	0.68±0.10**	13.57±15.72**	20.63±13.90**	26.11±9.68**	19.95±11.33**
nnUnet3	0.93±0.02*	0.81±0.10**	0.72±0.09**	0.70±0.10**	8.22±3.14**	18.00±13.43**	18.95±6.19**	19.33±8.48**
UResNet16	0.91±0.04**	0.72±0.15**	0.67±0.07**	0.75±0.08**	6.80±2.76**	11.92±9.18**	18.56±8.53**	12.18±12.87**
ProRSeg	0.94±0.02	0.86±0.08	0.78±0.07	0.82±0.05	5.69±1.72	7.00±5.14	12.11±5.30	8.11±3.54
ProRSeg++†	0.95±0.01**	0.91±0.02	0.83±0.02°	0.85±0.04	5.52±0.85	6.49±3.91	10.70±1.20°	7.35±2.50