This comprehensive work highlights benefits of quality techniques, approaches to implementation, and guidelines for specific quality assurance steps related to equipment and procedures used in radiotherapy. After an overview of manufacturing and engineering techniques, the text addresses quality and safety issues in radiotherapy from both the physician and physicist viewpoints. It also discusses quality for systems and processes in radiotherapy, including treatment of external beam radiotherapy and brachytherapy. The eminent contributors offer practical guides to quality in radiotherapy for both vendor- and patient-specific quality assurance procedures.