As deep learning technologies continue to advance, the availability of reliable methods to accurately interpret these models is critical. Based on a trained deep learning model (VGG19) for image classification, we have shown that methods using class activation mapping (CAM) and Grad-CAM have the potential to detect the most critical MRI feature patterns associated with relapsing remitting and secondary progressive multiple sclerosis, and healthy controls, and that these patterns seem to differentiate the two continuing subtypes of MS. This can help further understand the mechanisms of disease development and discover new biomarkers for clinical use.
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