Abstract
The comparison of Intensity Modulated Radiation Therapy (IMRT) with other conventional radiotherapy techniques has become an important research topic in recent years. The purpose of my study is to compare conventional 2 way, 3D CRT with IMRT techniques for external-beam treatment for nasopharyngeal carcinoma (NPC). Each patient’s contour data was planned using 2D, 3D CRT and IMRT separately. Data form radiation planning system was used to derive NTCP and TCP values from dose volume histogram (DVH). To calculate the NTCP, the effective volume DVH reduction scheme theory was used. Finally, three kinds of score function including K-value, TCP and NTCP are introduced to evaluate the impact of IMRT and conventional techniques on ranking of radiation treatment plans.