Table 5.

Summary of level set-based methods.

Study	Year	Datasets	No. of Patients	Performance			Image Modalities	Time/ Equipment	Category
				Dice (%)	ASD (mm)	HD (mm)
Wang [9]	2014	In-house	15	$92.00\pm 2.00$	$0.65\pm 0.19$	$0.96\pm 0.53$	CBCT	5 h/CPU	Level set-based
Zhang [63]	2009	MICCAI 2009	18	$87.93\pm 2.06$	—	$8.70\pm 3.28$	CT	—	Level set-based