Feasibility of perfusion and early‐uptake F‐FDG PET/CT in primary hepatocellular carcinoma: a dual‐input dual‐compartment uptake model Shaobo Wang1,2 · Boqiao Li3,4 · Pengfei Li5 · Ran Xie6 · Quanshi Wang7 · Hong Shi1 · Jianfeng He3,4