1. RADIATION ONCOLOGICAL ASPECTS OF QUALITY ASSURANCE IN RADIATION THERAPY

To improve the quality of radiotherapy and get brilliant results in cancer treatment, establishment of a quality system consisting of quality assurance and quality control is most important. The radiation prescription should be based on all available clinical information on Biology, natural history and imaging, and histology of the tumor. Treatment planning consists mainly of choice of the the best arrangement of a radiation treatment field (target volume) and localization of organs at risk to get the high precision method. Radiotherapy is an area where there is an urgent for more quality assurance, quality control and cooperative efforts at the national level.