"Version: 20220401"--Title page verso.Includes bibliographical references.1. Introduction and historical perspective -- 1.1. Principle of radiotherapy -- 1.2. Methods of radiotherapy delivery -- 1.3. The need for imaging in radiotherapy -- 1.4. Non-radiological image guidance systems -- 1.5. The advantages of IGRT2. Two-dimensional (2D) off-line image guidance in radiation therapy -- 2.1. Radio…