Figure 4 Values obtained by three-dimensional (3D) computed tomographic angiography with computed tomographic colonography (3D-CTA with CTC) and 3D computed tomographic angiography (CTA) for the portal phase. The CT values according to 3D-CTA with CTC were significantly superior than those of 3D-CTA for the superior mesenteric vein (SMV) (3D-CTA, 178.9±26.1 Hounsfield unit [HU]; 3D-CTA with CTC, 208.2±19.9 HU; P=0.003), middle colonic vein (MCV) (3D-CTA, 177.6±34.6 HU; 3D-CTA with CTC, 200.4±27.9 HU; P=0.036), inferior mesenteric vein (IMV) (3D-CTA, 183.3±38.0 HU; 3D-CTA with CTC, 216.9±26.3 HU; P=0.019), left colonic vein (LCV) (3D-CTA, 130.7±52.4 HU; 3D-CTA with CTC, 178.3±31.6 HU; P=0.024), and sigmoidal vein (SV) (3D-CTA, 134.6±50.9 HU; 3D-CTA with CTC, 174.5±27.3 HU; P=0.046). Statistical analyses were performed at a significance level of 0.05 by using the Mann-Whitney U test.