Table 3.

Experiment 2—Detailed DSC and SMBD performances after training and testing at several compression ratios for 3D and 3D fine-tuned U-Net segmentation of the bladder on CT and CBCT images.

Bladder		Compression ratio
		1:1	24:1	32:1	48:1	64:1	96:1	128:1
DSC	3D FT CT	$0.916\pm 0.033$	$0.900\pm 0.041$	$0.893\pm 0.057$	$0.887\pm 0.050$	$0.870\pm 0.073$	$0.834\pm 0.072$	$0.702\pm 0.155$
	3D CT	$0.916\pm 0.033$	$0.912\pm 0.034$	$0.902\pm 0.043$	$0.885\pm 0.060$	$0.859\pm 0.076$	$0.758\pm 0.122$	$0.409\pm 0.291$
	3D FT CBCT	$0.832\pm 0.118$	$0.856\pm 0.095$	$0.837\pm 0.102$	$0.835\pm 0.092$	$0.802\pm 0.114$	$0.741\pm 0.097$	$0.652\pm 0.120$
	3D CBCT	$0.832\pm 0.118$	$0.825\pm 0.123$	$0.808\pm 0.129$	$0.780\pm 0.138$	$0.741\pm 0.141$	$0.651\pm 0.118$	$0.450\pm 0.133$
SMBD	3D FT CT	$1.445\pm 0.579$	$1.533\pm 0.554$	$1.750\pm 1.086$	$1.895\pm 0.941$	$2.167\pm 1.395$	$2.675\pm 1.330$	$4.701\pm 3.033$
	3D CT	$1.445\pm 0.579$	$1.546\pm 0.615$	$1.831\pm 0.806$	$2.083\pm 1.123$	$2.458\pm 1.356$	$3.901\pm 1.995$	$8.205\pm 4.186$
	3D FT CBCT	$2.582\pm 1.963$	$2.185\pm 1.548$	$2.529\pm 1.782$	$2.537\pm 1.598$	$2.971\pm 1.976$	$3.570\pm 1.577$	$4.789\pm 1.815$
	3D CBCT	$2.582\pm 1.963$	$2.695\pm 2.033$	$2.955\pm 2.167$	$3.361\pm 2.364$	$3.857\pm 2.371$	$4.902\pm 1.920$	$7.811\pm 2.151$