Table 4. DSC, HD, and OI of RefineNet model-based OAR segmentation.

OAR	DSC			HD			OI
	Mean	Var		Mean	Var		Mean	Var
Bladder	0.860	0.086		19.981	11.418		0.783	0.120
Rectum	0.858	0.089		12.273	8.080		0.894	0.131
Sigmoid colon	0.664	0.123		98.409	50.984		0.601	0.190
Small intestine	0.563	0.129		68.123	33.781		0.811	0.163

DSC, Dice similarity coefficient; HD, Hausdorff distance; OI, overlap index; OAR, organ at risk.