Fig. 2
Tumor size measurement using enhanced CT in a 73-year-old man with colon cancer. a Tumor maximum diameter (Tdia) which is perpendicular to the colonic wall. b The reconstructed coronal image to measure tumor length (Tlen) with a broken line. c The manually drawn area along the margin of the tumor, and the value of this area (383 mm2) is automatically derived by software together with minimal, maximal, and average CT attenuation (in Hounsfield units)