Table 4.

Comparison of model performances using different methods.

		MSE (D2cc)	|ΔD2cc|	|ΔD1cc|	|ΔD0.1cc|	|ΔDmax|	|ΔDmean|
Bladder	KDE	0.27	0.44 ± 0.28	0.47 ± 0.29	0.5 ± 0.42	2.1 ± 1.9	0.32 ± 0.2
	KDE+kNN+PCA	0.23	0.38 ± 0.29	0.4 ± 0.32	0.43 ± 0.36	0.97 ± 0.66	0.13 ± 0.09
Rectum	KDE	0.27	0.43 ± 0.31	0.45 ± 0.34	0.54 ± 0.49	0.93 ± 0.72	0.31 ± 0.23
	KDE+kNN+PCA	0.18	0.34 ± 0.27	0.38 ± 0.33	0.63 ± 0.57	1.41 ± 0.99	0.23 ± 0.17

The mean squared error and the absolute residual between predicted values and ground truth were calculated.