This expanded edition provides step-by-step guidelines on performing the technical aspects of radiation therapy. Important new coverage includes treatment preparation, 3-D treatment planning, dosimetry, new technologies, documentation and quality assurance. In addition, this edition has added treatment simulation and treatment planning guidelines by body region (head and neck, thorax, pelvis), and an expanded art programme, including many new four-colour illustrations. Other features include: new materials on - beam geometry, contouring, intensity, modification, three-dimensioal treatment planning, principles of combining isodose charts and principles of field arrangements; each chapter includes a question and answer section; reviews how beam modification affects dose distribution; provides dose calculation instructions for a variety of clinical situations; and reviews pre-treatment procedures and patient positioning.