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Evaluation of the deliverability of dynamic conformal arc therapy (DCAT) by gantry wobble and its influence on dose

 Changhwan Kim  ;  Hojae Kim  ;  Dongmin Jung  ;  Heesoo Kim  ;  Yeonok Park  ;  Min Cheol Han  ;  Chae-Seon Hong  ;  Hojin Kim  ;  Ho Lee  ;  Jinsil Sung  ;  Dong Wook Kim  ;  Jin Sung Kim 
 SCIENTIFIC REPORTS, Vol.14(1) : 7134, 2024-03 
Journal Title
Issue Date
Humans ; Particle Accelerators ; Radiometry / methods ; Radiotherapy Dosage ; Radiotherapy Planning, Computer-Assisted / methods ; Radiotherapy, Conformal* / methods ; Radiotherapy, Intensity-Modulated* / methods
We aimed to investigate the deliverability of dynamic conformal arc therapy (DCAT) by gantry wobble owing to the intrinsic inter-segment break of the Elekta linear accelerator (LINAC) and its adverse influence on the dose to the patient. The deliverability of DCAT was evaluated according to the plan parameters, which affect the gantry rotation speed and resultant positional inaccuracies; the deliverability according to the number of control points and dose rates was investigated by using treatment machine log files and dosimetry devices, respectively. A non-negligible degradation in DCAT deliverability due to gantry wobble was observed in both the treatment machine log files and dosimetry devices. The resulting dose-delivery error occurred below a certain number of control points or above a certain dose rate. Dose simulations in the patient domain showed a similar impact on deteriorated deliverability. For targets located primarily in the isocenter, the dose differences were negligible, whereas for organs at risk located mainly off-isocenter, the dose differences were significant up to − 8.77%. To ensure safe and accurate radiotherapy, optimal plan parameters should be selected, and gantry angle-specific validations should be conducted before treatment. © The Author(s) 2024.
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1. College of Medicine (의과대학) > Dept. of Radiation Oncology (방사선종양학교실) > 1. Journal Papers
Yonsei Authors
Kim, Dong Wook(김동욱) ORCID logo https://orcid.org/0000-0002-5819-9783
Kim, Jinsung(김진성) ORCID logo https://orcid.org/0000-0003-1415-6471
Kim, Changhwan(김창환)
Kim, Hojin(김호진) ORCID logo https://orcid.org/0000-0002-4652-8682
Seong, Jin Sil(성진실) ORCID logo https://orcid.org/0000-0003-1794-5951
Lee, Ho(이호) ORCID logo https://orcid.org/0000-0001-5773-6893
Han, Min Cheol(한민철)
Hong, Chae-Seon(홍채선) ORCID logo https://orcid.org/0000-0001-9120-6132
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