A Study on the Change in Surface Dose Caused by Electromagnetic Radiation According to the Angle of the Collimator

During radiation therapy, the mobility of the multi-leaf collimator varies according to the shape of the tumor and the angle of the collimator. Therefore, the purpose of this study is to understand the change in surface dose according to the collimator angle and the shape of the tumor. Using 10MV electromagnetic radiation, a treatment plan was implemented according to the length and short axis ratio of the tumor and the collimator angle, and the surface dose was compared with the actual measured value. As a result of the evaluation, the surface dose increased as the length of the tumor decreased and the angle of the collimator increased. If it is necessary to reduce the surface dose through this, the collimator angle should be applied in consideration of the short/long ratio.