Sanli, Yusuf TolgaCukurcayir, FundaAbacigil, Fatma2024-09-192024-09-1920161513-7368https://doi.org/10.7314/APJCP.2016.17.3.1197https://hdl.handle.net/20.500.12483/14617Background: This study aimed to facilitate decision-making in cases of breast cancer radiotherapy shifts by simulating millimetric shifts and analyzing their effects on dose distribution. Methods: The study included 30 patients with left side breast cancer who were treated with three dimensional conformal radiotherapy (3D-CRT) in the Radiation Oncology Department in Hatay Public Hospital, between January 2013 and April 2015. A treatment plan shifting at three axes with six different measures was simulated. Results: The biggest difference in values was (+3mm shift) 476cGy, with a 7.7 % change for heart and 25.6% for spinal cord. The shifts in values respectively for CTV min, mean, max were -4.8%, 2.5%, 4%. The differences for lymphatic min, mean, max were 21.3%, 20.3%, -12.2%. Conclusion: The most important thing is not the treatment plan quality, but its practicality. The treatment plan must be practical and its practice must be controlled rigidly.eninfo:eu-repo/semantics/openAccessBreast cancerMillimetric shiftsRadiation dose distributionRadiotherapyArticle1731197119910.7314/APJCP.2016.17.3.1197270397482-s2.0-84965071670Q3