Quality Control Results for Linear Accelerator at Oncology Center in Nouakchott

Abstract

Radiation therapy plays an important role in the treatment of malignant tumour. The quality control for linear accelerator is one of the keys to ensure the correct and safe implementation of accurate radiotherapy. The National Center of Oncology in Nouakchott is equipped with a linear accelerator which provides two energies in photon regime 6 MV and 18 MV. The aim of this work is to measure the percentage depth dose (PDD) by two different ionization chambers: PTW 0.125 cm 3 and PTW 0.6 cm 3 and to compare the measured results with the results calculated by Treatment Planning Systems (TPS). For the energy of 6 MV beam photon and for different dimensions of the field size, we have measured the percentage depth dose by two ionization chambers PTW 0,125 cm 3 and PTW 0,6 cm 3 . From these results, we have plotted the curves of the PDD and the relative deviation. We compared the measurements of the percentage depth dose by the two ionization chambers. We have found that the results obtained are consistent with those calculated by TPS. There was note a slight difference between the depths measured by the two ionization chambers (PTW 0,125 cm 3 and PTW 0, 6 cm 3 chamber) and also that the latter is related to the field size.