Table 6.

Experiment 3—Detailed DSC and SMBD performances after training at specific compression ratios of 48:1, 64:1, and 96:1 and testing at several compression ratios for 3D U-Net segmentation of the rectum on CT and CBCT images.

Rectum		Compression ratio
		1:1	24:1	32:1	48:1	64:1	96:1	128:1
DSC	3D FT 48 CT	$0.740\pm 0.086$	$0.741\pm 0.082$	$0.744\pm 0.079$	$0.739\pm 0.082$	$0.725\pm 0.082$	$0.653\pm 0.077$	$0.389\pm 0.154$
	3D FT 64 CT	$0.740\pm 0.070$	$0.740\pm 0.067$	$0.742\pm 0.062$	$0.737\pm 0.063$	$0.729\pm 0.066$	$0.675\pm 0.067$	$0.416\pm 0.155$
	3D FT 96 CT	$0.719\pm 0.067$	$0.717\pm 0.068$	$0.716\pm 0.066$	$0.710\pm 0.063$	$0.703\pm 0.062$	$0.667\pm 0.069$	$0.483\pm 0.155$
	3D FT 48 CBCT	$0.758\pm 0.099$	$0.766\pm 0.087$	$0.764\pm 0.079$	$0.756\pm 0.080$	$0.731\pm 0.086$	$0.607\pm 0.112$	$0.385\pm 0.128$
	3D FT 64 CBCT	$0.743\pm 0.109$	$0.748\pm 0.100$	$0.748\pm 0.091$	$0.742\pm 0.092$	$0.729\pm 0.095$	$0.638\pm 0.116$	$0.444\pm 0.130$
	3D FT 96 CBCT	$0.700\pm 0.107$	$0.700\pm 0.104$	$0.699\pm 0.099$	$0.698\pm 0.096$	$0.682\pm 0.099$	$0.649\pm 0.106$	$0.538\pm 0.128$
SMBD	3D FT 48 CT	$3.441\pm 1.739$	$3.349\pm 1.757$	$3.291\pm 1.911$	$3.467\pm 2.074$	$3.599\pm 2.169$	$4.454\pm 2.269$	$10.33\pm 4.477$
	3D FT 64 CT	$3.231\pm 1.080$	$3.167\pm 1.099$	$3.111\pm 1.121$	$3.212\pm 1.205$	$3.239\pm 1.552$	$4.013\pm 1.854$	$9.504\pm 4.106$
	3D FT 96 CT	$3.125\pm 0.872$	$3.114\pm 0.919$	$3.117\pm 0.877$	$3.109\pm 0.856$	$3.413\pm 0.985$	$4.038\pm 1.407$	$7.637\pm 3.080$
	3D FT 48 CBCT	$2.734\pm 1.272$	$2.608\pm 1.222$	$2.582\pm 1.176$	$2.807\pm 1.184$	$2.708\pm 1.040$	$4.789\pm 2.993$	$10.67\pm 3.940$
	3D FT 64 CBCT	$2.738\pm 1.250$	$2.658\pm 1.169$	$2.595\pm 1.102$	$2.754\pm 1.064$	$2.614\pm 0.902$	$3.552\pm 1.037$	$8.525\pm 2.639$
	3D FT 96 CBCT	$3.179\pm 1.095$	$3.168\pm 1.078$	$3.120\pm 1.050$	$3.050\pm 0.954$	$3.121\pm 0.927$	$3.261\pm 0.903$	$5.880\pm 1.535$