Figure 2: The pre-(above) and post-treatment (below) CT imaging(A) and hybrid 18F-FDG PET imaging (B) in a breast cancer patient with a response to neoadjuvant chemotherapy. After neoadjuvant chemotherapy, the radioactivity of 18F-FDG in breast cancer area decreased significantly, with the tumor to nontumor FDG radioactivity ratio decreasing from 2.58 to 1.94.