FIGURE 4.  Multiphase PET/CT. Comparison of misalignment in protocol C (A) and protocol D (B). LD-CT attenuation scans were performed during shallow breathing. However, with regard to misalignment in liver, values for LD-CT were significantly lower. For protocol D, contrast-enhanced CT scan during NormExp did not show superiority over LD-CT scan during shallow breathing. Instead, values for LD-CT were significantly lower than those for arterial phase for liver. LD = low dose; ART = arterial; P-V = portal-venous. • = individual values; + = mean values. Error bars indicate SDs.