@article { author = {Gholami, Mohammad Hadi and Mohammadi, Mohammad and Sedighi, Abdolazim and Jaberi, Ramin and Rezaei, Fahimeh}, title = {Evaluation of dose distribution and dose gradient in brachytherapy cylindrical applicators using a dedicated Phantom for Iridium-192 and Cobalt-60 HDR sources}, journal = {Iranian Journal of Medical Physics}, volume = {15}, number = {Special Issue-12th. Iranian Congress of Medical Physics}, pages = {24-24}, year = {2018}, publisher = {Mashhad University of Medical Sciences}, issn = {2345-3672}, eissn = {2345-3672}, doi = {10.22038/ijmp.2018.11879}, abstract = {Introduction: A study was performed to evaluate radiation dose distribution and dose gradient around cylindrical applicators for high-dose-rate (HDR) brachytherapy systems with 192Ir, 60Co brachytherapy source applied for rectal and vaginal cancers treatments.   Materials and Methods: Two additional computed tomography (CT) based plans were generated using a dedicated Phantom for both 60Co source and 192IridumHDR sources. The phantom contains a film and TLD-100 position on the top and peripheral areas, and a rectum cylinder with 1.5 cm insert caps into the phantom. Dose coverage of 5-mm shell surrounding the cylinder, was then evaluated for both scenarios. Results:A significant dose reduction from the expectation dose for 192Ir at the central points of the cylinder tip was observed. The results were then verified by measurements through radio- chromic film and TLDs.   Conclusion: Both 60Co and 192Ir sources were found to be suitable HDR sources for vaginal treatment using a cylindrical applicator with advantages of reducing radiation exposure to Organ At Risks (OARs) in the lower dose range, and appropriate prescribed dose to the target}, keywords = {Dose Distribution,Cylinder Applicators,Brachytherapy,High Dose Rate Brachytherapy}, url = {https://ijmp.mums.ac.ir/article_11879.html}, eprint = {} }