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İstanbul Üniversitesi Onkoloji Enstitüsü, Tıbbi Radyofizik Bilim Dalı, İstanbul Intensity modulated radiation therapy (IMRT), based on the use of non-uniform radiation beam intensity of a new step in conformal radiotherapy. Was able to get the optimal dose distributions with IMRT can improve the clinical results. In case of inadequate use of IMRT, the result may be worse than conventional treatments. Multiple sub-areas the accuracy of IMRT dose used in these fields depends on the performance of linear accelerator quality control tests. Multileaf collimator (MLC) positioning accuracy, table movement, gantry and collimator indicators, with a gantry rotation speed and a lot of parameters such as rates of MLC. Linear accelerators used for IMRT in the treatment of pre-defined quality control program within the mechanical and dosimetric tests should be done periodically. In this study, linear accelerators capable of IMRT and IMRT plans for quality controls were investigated in the literature. Keywords : Quality assurance; MLC; intensity modulated radiotherapy