Table 4.

Utilization of image segmentation techniques for COVID-19

Authors	Segmentation Tech.	ROI	Utilization
Zheng et al. [124]	U Net	Lung	Examination
Cao et al. [13]	U Net	Lesion/ Lung	Evaluation
Huang et al. [40]	U Net	Lung lobes/ Lesion/ Lung	Evaluation
Qi et al. [79]	U Net	Lung lobes/ Lesion	Evaluation
Gozes et al. [35]	U Net	Lesion/ Lung	Examination
Li et al. [63]	U Net	Lesion	Examination
Chen et al. [18]	UNet++	Lesion	Examination
Jin et al. [45]	UNet++	Lesion /Lung	Examination
Shan et al. [86]	VB-Net	Lung lobes/ Lesion/ Lung	Evaluation
Tang et al. [96]	Commercial Software	Lesion /Lung	Evaluation
Shen et al. [89]	Threshold-based region growing	Lesion	Evaluation