Fig. 4
Image matrix shows the heatmaps for decision of trained model by Grad-CAM application. In the case of a prediction as trigeminal neuralgia, higher gradient heatmaps are concentrated around the sphenoid body to clivus. However, false positive cases show that the area is more spreadout (A,B). Heatmaps for predicting control is concentrated at the calvarium or the cervical spines (C,D). The skull images are slightly blurred with gausian filtering to enhance anonymity. In the actual investigation, blurring was not applied to the images.
