Modern radiotherapy techniques try to deliver the radiation dose by steep gradient. Protocols for these complex treatment delivery techniques are important and extremely sensitive to errors in treatment delivery. To minimize such errors, 3D dosimeters were developed as a relative method for improving dose monitoring and delivery. The aim of this study is to analyze the capability and drawbacks of different types of 3D dosimeters such as Fricke gel dosimeters, Hypoxic gel polymers, Normoxic gel polymers and  3D radiochromic solid polymer known as PRESAGE. The results of studies show that the optimum method of dosimetry in radiation therapy is using PRESAGE dosimeter