Progress in Medical Physics (한국의학물리학회지:의학물리)

Korean Society of Medical Physics (한국의학물리학회)
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Dosimetric Analysis of Lung Stereotactic Body Radiotherapy Using Halcyon Linear Accelerator

  • Shinhaeng Cho (Department of Radiation Oncology, Chonnam National University Hwasun Hospital) ;
  • Ick Joon Cho (Department of Radiation Oncology, Chonnam National University Hwasun Hospital) ;
  • Yong Hyub Kim (Department of Radiation Oncology, Chonnam National University Hwasun Hospital) ;
  • Jea-Uk Jeong (Department of Radiation Oncology, Chonnam National University Medical School) ;
  • Mee Sun Yoon (Department of Radiation Oncology, Chonnam National University Medical School) ;
  • Taek-Keun Nam (Department of Radiation Oncology, Chonnam National University Medical School) ;
  • Sung-Ja Ahn (Department of Radiation Oncology, Chonnam National University Medical School) ;
  • Ju-Young Song (Department of Radiation Oncology, Chonnam National University Medical School)
  • Received : 2023.09.25
  • Accepted : 2023.12.08
  • Published : 2023.12.31
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Abstract

Purpose: In this study, the dosimetric characteristics of lung stereotactic body radiotherapy (SBRT) plans using the new Halcyon system were analyzed to assess its suitability. Methods: We compared the key dosimetric parameters calculated for the Halcyon SBRT plans with those of a conventional C-arm linear accelerator (LINAC) equipped with a high-definition multileaf collimator (HD-MLC)-Trilogy Tx. A total of 10 patients with non-small-cell lung cancer were selected, and all SBRT plans were generated using the RapidArc technique. Results: Trilogy Tx exhibited significant superiority over Halcyon in terms of target dose coverage (conformity index, homogeneity index, D0.1 cc, and D95%) and dose spillage (gradient). Trilogy Tx was more efficient than Halcyon in the lung SBRT beam delivery process in terms of the total number of monitor units, modulation factor, and beam-on time. However, it was feasible to achieve a dose distribution that met SBRT plan requirements using Halcyon, with no significant differences in satisfying organs at risk dose constraints between both plans. Conclusions: Results confirm that Halcyon is a viable alternative for performing lung SBRT in the absence of a LINAC equipped with HD-MLC. However, extra consideration should be taken in determining whether to use Halcyon when the planning target volume setting is enormous, as in the case of significant tumor motions.

Keywords

Acknowledgement

This study was financially supported by Chonnam National University (Grant number: 2022-2617).

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