Abstract: The research of esophageal target is a difficult spot in the precise radiotherapy and the target mobility has an important effect for the radiotherapy of esophageal cancer. By different breathing control techniques, controlling the patient's respiratory may narrow target mobility so as to improve the accuracy of radiotherapy. But the present studies of the movement range of esophageal cancer with the respiratory control technologies have not come to a consistent standard. The area shape and position change of esophageal cancer target is a key problem that needs to be solved in the esophageal precise radiotherapy.

Key words: Esophageal neoplasms, Radiotherapy, Motion