Study On Mathematical Model And Algorithm Based On Pet/ct Imrt

Intensity modulated radiation therapy (IMRT), a widely used optimizing approach for the radiation therapy in cancer treatment, is an important technology which has been developing rapidly in the last 10 years. In recent years, with the invention and development of PET/CT equipment, both geometric and biological information of cancer can be obtained through PET/CT diagnosis, which provide us more information about cancer such as the active index and diffusion trend of the tumor cells which show more accurate information for radiotherapy. However, PET shows only the biological information of the tumor with is of poor visibility. The current hot issues are how to demonstrate these information in the form of geometry.(1) Since PET image is of poor definition, image identification has to be introduced in the information treatment. Based on the discrete data of the image, an information identification model and a relative algorithm are introduced. The numerical algorithm is efficient, and can be used in N dimensional problems.(2) In the study of the numerical treatment of IMRT medical plans, the optimization combination of shape matrices to form a aperture is analyzed. The optimal conditions are derived and proved basing on two basic objective functions.(3) A method for defining clinical target volumn according to biological information is given by the revised heat conduction model of differential equations for defining clinical target volumn according to PET/CT radiotherapy.