FIGURE 2.  Comparison of misalignment of contrast-enhanced CT examinations for protocols A, B, C, and D. Protocol B (NormExp; single phase) had significantly lowest values for all abdominal organs. Significant differences between multiphase protocols (C and D) could not be assessed. art = arterial; p-v = portal-venous. • = individual values; + = mean values. Error bars indicate SDs.