Table 2.

Quantitative evaluation of the proposed segmentation system before and after applying rotation invariant Markov–Gibbs random field (MGRF). Note that LCG, DSC, BHD, and ALVD stand for linear combination of Gaussian, Dice similarity coefficient, 95th-percentile bidirectional Hausdorff distance, and absolute lung volume difference, respectively.

		DSC	Overlap	BHD	ALVD
LCG-model	Healthy/Mild	${96.37}_{\pm 0.47}\%$	${92.99}_{\pm 0.88}\%$	${11.32}_{\pm 4.59}$	${3.58}_{\pm 2.06}$
	Moderate	${92.57}_{\pm 4.64}\%$	${86.47}_{\pm 7.61}\%$	${9.59}_{\pm 5.30}$	${7.31}_{\pm 7.39}$
	Severe	${82.51}_{\pm 13.13}\%$	${71.98}_{\pm 17.26}\%$	${13.77}_{\pm 7.20}$	${23.16}_{\pm 19.29}$
	Overall	${89.59}_{\pm 9.76}\%$	${82.31}_{\pm 13.72}\%$	${11.24}_{\pm 6.08}$	${12.29}_{\pm 14.63}$
Final System	Healthy/Mild	${\mathbf{97.53}}_{\pm \mathbf{0.56}}\%$	${\mathbf{95.18}}_{\pm \mathbf{1.06}}\%$	${\mathbf{2.41}}_{\pm \mathbf{1.12}}$	${\mathbf{1.72}}_{\pm \mathbf{1.09}}$
	Moderate	${\mathbf{95.54}}_{\pm \mathbf{1.91}}\%$	${\mathbf{91.53}}_{\pm \mathbf{3.41}}\%$	${\mathbf{4.25}}_{\pm \mathbf{3.73}}$	${\mathbf{3.48}}_{\pm \mathbf{2.59}}$
	Severe	${\mathbf{95.19}}_{\pm \mathbf{1.66}}\%$	${\mathbf{90.87}}_{\pm \mathbf{3.01}}\%$	${\mathbf{6.70}}_{\pm \mathbf{6.97}}$	${\mathbf{2.52}}_{\pm \mathbf{2.32}}$
	Overall	${\mathbf{95.76}}_{\pm \mathbf{1.83}}\%$	${\mathbf{91.76}}_{\pm \mathbf{3.29}}\%$	${\mathbf{4.86}}_{\pm \mathbf{5.01}}$	${\mathbf{2.93}}_{\pm \mathbf{2.39}}$