Table 3. Performance comparison of four evaluation methods.

Methods	DC(%)	IoU(%)	Sen(%)	Acc(%)
Threshold segmentation	$70.98\pm 0.15$	$56.09\pm 0.20$	$61.64\pm 0.23$	$97.40\pm 0.02$
Region Growing	$64.30\pm 0.21$	$49.07\pm 0.26$	$51.96\pm 0.30$	$97.26\pm 0.02$
Maximum entropy	$50.77\pm 0.12$	$35.33\pm 0.11$	$95.35\pm 0.10$	$91.02\pm 0.07$
K-Means clustering	$75.21\pm 0.11$	$60.93\pm 0.11$	$70.92\pm 0.13$	$97.59\pm 0.02$