CBCT (Cone-Beam CT)-Based Online Adaptive Radiotherapy in the Post-operative Oesophageal Cancer Patient.

We present a case of a patient having cone-beam CT (CBCT)-based online adaptive radiotherapy (oART) on Ethos Therapy after oesophagectomy and gastric pull-up. This case report aims to demonstrate that daily oART is a viable treatment option for post-oesophagectomy patients. The patient's radiotherapy plan was generated on the Ethos system using an eight-field intensity-modulated radiation therapy (IMRT) plan imported from the Eclipse planning system.