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Abstract
Background/aim: This study aimed to compare the dosimetric consequences of respiratory movement in volumetric-modulated arc therapy (VMAT) and three-dimensional conformal radiation therapy (3D-CRT) during postmastectomy radiation therapy, including internal mammary nodes (IMNs).

Materials and methods: Respiratory motion was implemented to a phantom using a dynamic device. The plans were delivered during cranial-caudal and ventral-dorsal movement in 5-mm (R05) and 10-mm (R10) amplitudes.

Results: At the IMN, the dose errors were -2.8% (R05) and -6.2% (R10) for 3D-CRT and -4.9% (R05) and -8.5% (R10) for VMAT. The dose errors in chest wall were -.5% (R05) and -6.0% (R10) for 3D-CRT and -1.9% (R05) and -5.3% (R10) for VMAT. The left anterior descending doses showed significantly small absolute values. The gamma pass rates of VMAT were higher than those of 3D-CRT.

Conclusions: The benefit of VMAT technique in dose distribution was maintained, except in occasional instances of large breathing motion.

Affiliations

Hosang Jeon  1 , Yongkan Ki  2   3 , Dong Woon Kim  3 , Wontaek Kim  2   4 , Jiho Nam  4 , Donghyun Kim  2   4 , Dahl Park  4 , Jongmoo Park  5 , Ji Hyeon Joo  2   3
1 Department of Radiation Oncology and Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, South Korea.
2 Department of Radiation Oncology, Pusan National University School of Medicine, Yangsan, South Korea.
3 Department of Radiation Oncology, Pusan National University Yangsan Hospital, Yangsan, South Korea.
4 Department of Radiation Oncology, Pusan National University Hospital, Busan, South Korea.
5 Department of Radiation Oncology, Kyungpook National University Chilgok Hospital, School of Medicine, Kyungpook National University, Daegu, South Korea.