Quantitative measurement of contrast enhancement of esophageal squamous cell carcinoma on clinical MDCT

Figure 1 Oblique sagittal reformatted computed tomography images (A) of a 75-year-old man with squamous cell carcinoma in the lower thoracic portion of the esophagus (black arrows). The surgical cut edge is determined by a radiologist and a pathologist working in consensus (white arrowhead); and the background normal esophagus (white arrows) has been chosen in the thoracic upper portion. To generate the enhanced attenuation, two regions of interest (B and C) for the esophageal cancer and for the background normal esophagus are drawn freehand around the tumor and around the esophageal wall, respectively; the enhanced attenuation values correspond to 84 HU and 57 HU, respectively.