Abstract:
The most important criterion of radical radiotherapy is accuracy in all planning stage and in delivery of the prescribed treatment .To overcome the problems of movement of the patients during radiotherapy delivery ,individual plaster-bandage cast were made for each patient ensure immobilization of affected treatment area . The study was performed at national cancer Institute (NCI) during period of June to December 2010. The aim of the study was to evaluate the patient with nasopharyngeal carcinoma set-up in external beam radiotherapy and to highlight the role of patient positioning and immobilization in optimization of patient treatment. This is an experimental study designed to evaluate the radiotherapy patient positioning (setup) and its reducibility day to day. The study had demonstrated that the field of the nasopharyngeal carcinoma treatment of the set-up in NCI and their shift in the center, SSD, SSN and field borders. In addition to check new positioning and restraining devices may be resimulation of the treatment filed may require ensuring continuous correct patient-beam alignment when weight changes occur.
The result of this thesis as follows; firstly, there are important consideration for accurate patient set-up such as general patient condition and individual immobilization device. Secondly During recent years the correct patient positioning has been improved with the modern radiotherapy machines. The Center Shift Right-left (70, 46.7%) match, (80, 53.3%), SSD match 66 (44%), No match 84 (56%), SSN match 63 (42%), No match 87 (58%), Collimator Angle match 74 (49%), No match 76 (50.7%), gantry Angle match 88 (58.7%), No match 62 (41.3%).
