Online adaptive radiotherapy for Head and Neck cancers on the MR Linear Accelerator: Introducing a novel modified Adapt-to-Shape approach

Abstract The Elekta Unity MR-Linac provides the ability to perform daily adaptive radiotherapy for head and neck cancers. We compared the Elekta Unity Adapt-to-Position against the novel Adapt-to-Shape-Lite radiotherapy strategies in patients with head and neck cancers. Early data from the first two patients treated at our institute show that Adapt-to-Shape-Lite is capable of producing optimised plans with negligible clinical goal failure rates in tolerable time frames.