The Study Of Radiation Dose In Radiotherapy

In recent years, the incidence and mortality of malignant tumors are up in the trend and the cancer has become urban residents’ first cause of death. WHO had announced in1998:45%of person which get the cancer can be cured. In those person,22%can be cured by surgical treatment,18%can be cured by radiation therapy,5%can be cured by chemotherapy. About70%of cancer patients receive radiation therapy in the different stages of the treatment. This shows the importance of radiation therapy for cancer treatment. In the treatment process of radiation therapy, the calculation and control of the dose is very critical technology, and it plays an important role in its therapeutic effect of radiotherapy therapy. The Monte Carlo method is recognized as the best way to calculate the dose of radiotherapy.In this paper,first it introduces the physical and medical foundation in radiotherapy and the development history of the X-ray treatment in radiotherapy and dose study with Monte Carlo method.Then, I use the Monte Carlo simulation software Geant4to simulate X-ray’s dose distribution in radiation therapy with medical linear accelerator and compare the theoretical results with the experimental results.Then it verifies that the Monte Carlo simulation for radiation therapy has high-precision and reliability, while I analyse the physical process in the X-ray radiation therapy and the causes of the dose distribution according to the experimental results.Finally, through the simulation of the Monte Carlo simulation software Geant4, I analyse the role of each part of the head in the machine and the physical processes which occur in the machine during X-ray radiation therapy.I wish it can guide the design of medical linear accelerators.