A stationary assembly of computer-based devices designed to deliver a therapeutic radiation dose to an anatomical region, typically to treat malignant tumours, and which uses CT-based image-guided radiation therapy (IGRT) [e.g., CBCT, fluoroscopy] and intensity-modulated radiation therapy (IMRT) functionalities to provide automatic adjustment of the radiation dose and delivery settings according to the location, 3-D shape, and motion of the tumour during a treatment session. It typically consists of a rotating gantry, a treatment head with a radioactive source (typically cobalt), CT imaging unit, multi-leaf collimator, robotic patient table, and an operator's console.