Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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Comparison of Dosimetric Parameters Based on Beam Arrangement Changes in HA-WBRT by Using VMAT Technique: A Phantom Study

VMAT 기법을 활용한 HA-WBRT에서 빔 배열 변화에 따른 선량학적 인자 비교: 팬텀 연구

  • Sung-Kuk Park (Department of Radiation Oncology, Pusan National University Hospital) ;
  • Dong-Hyun Kim (Department of Radiological Science, College of Health Sciences, Catholic University of Pusan)
  • 박성국 (부산대학교병원 방사선종양학과) ;
  • 김동현 (부산가톨릭대학교 보건과학대학 방사선학과)
  • Received : 2024.06.10
  • Accepted : 2024.07.04
  • Published : 2024.08.31
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Abstract

This study aimed to evaluate the impact of changes in beam arrangement and arc counts on dosimetric factors in volumetric modulated arc therapy (VMAT) inverse radiation therapy planning for hippocampal-avoidance whole brain radiation therapy (HA-WBRT) by using the Elekta Monaco radiation therapy planning system (RTPs). For coplanar VMAT, both the arc per beam (APB) method and the beam determined arc(BDA) method, which is determined by the number of beams, were applied. For non-coplanar VMAT, the BDA method was utilized, and a total of 9 treatment plans were established by varying the arc counts. All radiation therapy plans met the radiation oncology group (RTOG) 0933 protocol standards, and 14 dosimetric factors were compared and analyzed. The results showed that the BDA-NC VMAT method demonstrated superior performance in terms of planning target volume (PTV) coverage and protection of normal organs, while APB-VMAT was advantageous in terms of hippocampal protection, monitor unit and delivery time. This study is expected to contribute to the efficient establishment of HA-WBRT plans considering the changes in beam arrangement and rotation arc numbers in Monaco RTPs.

Keywords

References

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