Fig. 4.

Visualization with Grad-Class Activation mapping (CAM) results in external validation test. A Correct detection images. The images in 1st and 2nd row (true positive images) are the original plain C-ray images and CAM applied images with FNF, whereas the images in 3rd and 4th row (true negative images) are the original plain X-ray images and CAM applied images without fracture. B False detection images. The images in in 1st row are false-positive images, whereas the images in in 2nd, 3rd, and 4th row are false-negative images with unidentified areas highlighted by CAM in images