VERIFICATION OF LINEAR ACCELERATOR QUALITY AT ONCOLOGY CENTER IN NOUAKCHOTT BY COMPARISON WITH IAEA STANDARDS

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 control the quality of this accelerator by comparing the measured results with those calculated with Treatment Planning Systems(TPS).The percentage depth dose (PDD), the main parameter generally used to verify the accelerator quality,was measured by ionization chambers (PTW 0.125 cm3).The PDD measures have been determined for 6MV and 18MV beam photon energy, for four different dimensions of the field size. The measured results by the ionization chamber are comparable for all chosen treatment field dimensions to those calculated by TPS.