Table 7.

Summary of image feature extraction methods used by different papers for X-ray images

CNN	Papers	Count
ResNet	[22–24, 27, 29, 33, 35, 37, 39–43, 46, 49, 50, 57, 59, 61, 63, 69–72, 86, 88, 89, 91]	27
DenseNet	[23, 25, 32, 38, 40, 42, 46, 49, 59, 63, 66, 70, 72, 86, 87, 89, 91]	17
VGG	[23, 24, 28, 33, 37, 48, 49, 59, 60, 63, 66, 71, 72, 86, 92]	15
Inception	[23, 27, 28, 41, 46, 49, 52, 59, 63, 66, 70, 91]	12
InceptionResNet	[23, 27, 28, 42, 46, 59, 63, 66]	8
Xception	[23, 28, 34, 35, 47, 59, 63, 66]	8
AlexNet	[23, 31, 45, 57, 71, 72]	6
SqueezeNet	[49, 57, 70, 87, 88]	5
GoogLeNet	[23, 24, 57, 71]	4
NASnet	[25, 42, 59]	3
ShuffleNet	[23, 87]	2
EfficientNet	[37]	1
Simple CNN	[31]	1