TY - JOUR ID - 13055 TI - The Feasibility of Thyroid Treatment with 99mTc Radiopharmaceuticals and Stable Iodine as Contrast Agent Using MCNP Simulation Code JO - Iranian Journal of Medical Physics JA - IJMP LA - en SN - AU - Noorvand, Mahsa AU - Shirmardi, Seyed Pezhman AU - Erfani, Mostafa AD - Department of Physics, Islamic Azad University-Central Tehran Branch (IAUCTB), Tehran, Iran. AD - Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran, 09126864850, P_shirmardi@aut.ac.ir. Y1 - 2018 PY - 2018 VL - 15 IS - Special Issue-12th. Iranian Congress of Medical Physics SP - 393 EP - 393 KW - Cancer Thyroid Technetium-99m KW - absorption dose stable Iodine MCNP MIRD DO - 10.22038/ijmp.2018.13055 N2 - Introduction: Nowadays, radioisotopes have a lot of therapeutic and diagnostic applications in nuclear medicine. The technetium-99m radioisotope is widely used in the diagnostic field. The technetium-99m radioisotope is widely used in the diagnostic field. In this study, in order to increase the absorption dose in thyroid cancer cells, the radioactive drug technetium-99m which is gamma emitter has been used along with iodine precursor in the desired concentrations.   Materials and Methods: Using the MIRD method and the MCNP simulation code, the absorbed dose and the effective dose originating from the radioactive technetium-99m, has been calculated for thyroid with the stable iodine contrast in the concentrations of 5, 10 and 100 mg/ml, and without it. Regarding the concentration of stable iodine in the thyroid that increases its equivalent atomic number, when photon is encountered with thyroid cancer cells with high equivalent atomic number, it creates photonelectrons. These photoelectrons can effectively lead to DNA fractures and thus cause damage and kill cancer cells. Results: Considering the activity of 185 MBq from the radiopharmaceutical technetium-99m and stable iodine contrast in the desired concentrations, the increase percentage of absorption dose in the thyroid in the presence of stable iodine with concentrations of 5, 10 and 100 mg/ml was 7.25, 7.77 and 15.5%, respectively. Conclusion: The results of this study indicate that prescription of stable iodine contrast in different concentrations along with technetium-99m increases the absorption rate of the thyroid. Therefore, this technique can be used to treat thyroid tumors with technetium-99m which is a gamma-emitting agent. UR - https://ijmp.mums.ac.ir/article_13055.html L1 - ER -