4Halvorsen RA,Habib KM,Foster WL,et al. Esophageal cancer staging by CT: Long - ter follow study. Radiology, 1986,161 : 147.
5Plcus D, Balfe DM, Koehler BE,et al. Computed tomagraphy in staging of esophageal carcinoma. Radiology, 1983,146:433.
6Daffner RH, Halber MD, Postlethwait RW,et al. CT of the esophagus. Ⅱ.Carcinoma. A JR, 1979,133 : 1051 - 1055.
7Thompson WM, Halvorsen RA, Foster WLJ, et al. Computed tomography for staging esophageal and gastroesophageal cancer: reevaluation. A JR,1983,141:951 -958.
8Moss AA,Schnyder P,Thoeni RF, et al. Esophageal carcinoma: pretherapy staging by computed tomography. AIR, 1981,136 : 1051 - 1056.