Simulation Of Three-dimensional Energy Deposition Distribution Of High Energy Particles In Human Tissues

There are various radiation particles in our environment,and these radiation particles are constantly depositing radiation doses in the human body.Recently,radiation is increasingly used in cancer radiotherapy.Accurate understanding of the energy deposition characteristics of different radiation particles in human tissue is of great significance to the application of radiation particles and the choice of radiotherapy.Nowadays,the incidence of cancer is getting higher and higher,and the importance of radiotherapy as an advanced treatment has become increasingly apparent.The radiation particles mainly used in radiation therapy are electrons,photons and protons,among them,the development of electron beam radiotherapy and photon radiotherapy is relatively early,and the development of proton and other heavy ion radiotherapy is relatively slow.Regardless of the type of radiotherapy,the essence of radiotherapy is to apply ionizing radiation particles to deposit a large dose in the cancerous part,kill cancerous cells and achieve therapeutic purposes.With the development of three-dimensional conformal radiotherapy and intensity-modulated radiotherapy technology,the goal of radiotherapy technology is to develop a more precise radiotherapy plan and reduce the extra dose to patients.In recent years,the narrow beam proton scanning radiation method and the point-to-point proton radiotherapy method have made proton radiotherapy easier to perform conformal radiotherapy on cancerous tissue,and the therapeutic effect is better.However,the narrow particle beam is greatly affected by the scattering of the material.At present,the research on the particle energy deposition of the narrow beam is not sufficient.On the other hand,the energy deposition radiotherapy plan is mainly based on CT tomography,and the CT scanning technique acquires information of the human body through scanning the cross section of the human body.And in the process of radiotherapy,the radiation beam is generally parallel to the cross section of the human body or irradiates the human tissue at an angle,and the research on energy deposition perpendicular to the direction of incidence of particles is lacking.In this paper,Geant4 is used to simulate the process of several medical radiation particles(electrons,photons,protons)interacting with human tissues,and the characteristics of energy deposition of different particles are compared in multiple dimensions.The purpose is to provide reference for the development of autonomous composite three-dimensional conformal radiotherapy planning system in the future,and to provide a meaningful reference for the choice of radiotherapy methods for radiotherapy in hospitals.