Samenvatting

The purpose of this study was to investigate the inter-fractional deformation of the esophagus during radiotherapy treatment of esophageal cancer, using three-dimensional (3D) kilovolt (kV) conebeam computed tomography (CBCT). Additionally, deformation of the aorta and distance between aorta and esophagus were investigated to determine if deformation of the esophagus is influenced by the close presence of the aorta.