Fig. 3.

Selected shapes for the four liver lesions used in this study. The grey values indicate the distribution of the contrast uptake during the arterial and portal phase. Light grey stands for a high contrast uptake and dark grey for a low contrast uptake. The uptake of the HCC typically presents with a homogenous, high uptake during the arterial phase followed by washout in the portal phase. The haemangioma typically shows the ‘closing iris’ structure in the transition from arterial to portal venous distribution. The cyst does not uptake CA, in either the arterial or the portal venous phase. The metastasis has a small rim with a high CA uptake during both phases and a core with no enhancement during arterial phase and a low enhancement during the portal phase