Surface Radiation Dose Measurement with Mosfet for Head and Neck Cancer using Phantom

Abstract

Aim:The focus of this study was on the surface dose received by the patients during radiation treatment.1.2.Materials & Method: MOSFET ("Metal-Oxide-Semiconductor Field-Effect Transistor") detector due to its small size and greater reproducibility and sensitivity was used. Calibration of MOSFET was done to check for its accuracy and linearity along with field size dependence, dose-rate dependence, and angular dependence. Patient plans with Head & Neck cancer were taken and loaded onto the MOSFET. VMAT ("Volumetric-Modulated Arc Therapy") and 3DCRT ("3-Dimensional Computed Radiation Therapy") both techniques plans were taken.Result: Angular, field size, and dose-rate dependence was found to be ±1%, ±2.76%, and ±1.64% respectively. Conclusion:The measured values from MOSFET agreed with TPS (Treatment Planning System) calculated values for surface dose with 95% confidence.