Radiotherapy is a treatment of carcinogenic tumors using ionising radiation and the improvement radiotherapy techniques has been conducted to protection healthy tissues. Recent implementations have employed static fields with small dimensions. The interests for this work were fields, used in modern such as Stereotactic Radiation Therapy (SRS) Intensity Modulated (IMRT).

background: the monte carlo method is the most accurate method for simulation of radiation therapy equipment. the linear accelerators are currently the most widely used machines in radiation therapy centers. methods: in this work, a monte carlo modelling of the siemens oncor linear accelerator in 6 mv and 18 mv beams was performed. the results of simulation were validated by measurements in wat...