Radiation therapy, using a linear accelerator-based treatment was first accomplished in London, UK in 1953 and in Stanford, USA in 1956. If you look back on the technology so many advancements have been made in medical LINAC technology. Most recently technology advancements have allowed MRI-guided radiation therapy, MR-IGRT, to treat a cancerous tumor that was located in a patient’s heart that had previously been fitted with an implantable cardioverter defibrillator, ICD, a first of its kind.
There were a number of challenges that needed to be addressed with the integration of the MRI scanner to the LINAC and then treating a tumor that lay next to an ICD.
Physics World, an online publication has detailed the procedure in their latest installment which you are able to find here: https://www.acceletronics.com/medical/medical-radiation-oncology-equipment