The nasopharynx is a space in the pharynx and above the soft palate in the roof of the mouth that connects the back of the nose to the back of the mouth. Nasopharyngeal carcinoma is one of the most common head and neck cancers and occurs when cancer cells grow uncontrollably in the nasopharynx and the cancerous tumors that form spread to the lymph nodes, liver, and bones. The most important symptom is one or more painless lumps on the back of the neck. The best treatment is radiation therapy. Hearing loss can be a problem in this radiation therapy. To help resolve this problem, two adaptive 3D and intensity modulated treatment plans were set up using the Anchor accelerator. In this study, we used the MCNP code to verify the accuracy of accelerator simulation by calculating PDD curves and dose profiles in a water cube phantom with dimensions of 30 cm and a distance of 100 cm from the source in a 10 * 10 field and an energy of 6 MeV. Instead of using a phantom in the simulation, CT images of a real patient were used as code input using the CT TO MCNP program. After observing the simulated accelerator geometry with the Visual MCNP program, the CT geometry must now be drawn with the help of the Reflection program. After simulating the 3D-CRT and IMRT treatment methods with the MCNP code, we now used a rectangular mesh in square dimensions to calculate the dose and the results obtained were analyzed using the Matlab program. In this thesis, for calculating the cochlear dose using the F6 tally card in the target cell, 52/78 Gy was obtained in conformal simulation and 50/86 Gy in IMRT simulation, and the results of the simulation were eva‎luated with the TPS system.

سجاد مري , ايرج عابدي

ايرج جباري

ظفراله كلانتري , صديقه سجاديان