Table 1. Review of state-of-the-art lung segmentation algorithms.

Year	Authors	Method	No. of cases	Quality index	Quality index value
2006	Campadelli et al. (17)	Spatial edge detection	487	Overlap measure	82.00%
2007	Gao et al. (18)	Threshold based	8	Dice index	99.00%
2015	Dai et al. (19)	Shape-based	N/A	Dice index	98.00%
2017	Soliman et al. (20)	Shape-based	105	Dice index	98.50%
2016	Shi et al. (11)	Thresholding	23	Overlap measure	98.00%
2017	Rebouças Filho et al. (21)	Deformable model	40	F-measure	99.14%
2019	Zhang et al. (15)	Statistical finite element analysis	20	N/A	N/A
2020	Fischer et al. (16)	AI-RAD	137	N/A	N/A