Evaluation of a constructed head phantom response in comparison with RANDO head phantom in the same gamma field

Human tissue equivalent phantoms are widely used in medicine. They are used for dosimetry, calibration of medical devices, and quality control of radiotherapy equipment, as well as training students. Regarding to development of radiotherapy techniques for treatment of cancers and also development of educational centers in the country, the human equivalent phantoms are needed. Several phantoms have been designed and constructed over years around the world, including Rando phantom. Since Rando phantom is expensive to buy, a similar phantom has been constructed by Tabesh Pardaze Pegahs Company (TPPCO). In this study, in order to compare the constructed head phantom with the Rando head Phantom, both phantoms have been irradiated in the same gamma field. The results show that the average relative percent difference between gamma dose in constructed head phantom and Rando phantom are about 21%. More conformity with Rando phantom is achieved if some improvements are performed on the constructed phantom.