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Assessment of dosimetric leaf gap correction factor in Mobius3D commissioning affected by couch top

Authors
 Min Cheol Han  ;  Jihun Kim  ;  Chae-Seon Hong  ;  Kyung Hwan Chang  ;  Su Chul Han  ;  Kwangwoo Park  ;  Dong Wook Kim  ;  Myoung Kyu Park  ;  Yu Yun Noh  ;  Jin Sung Kim 
Citation
 PHYSICAL AND ENGINEERING SCIENCES IN MEDICINE, Vol.43(3) : 1069-1075, 2020-09 
Journal Title
 PHYSICAL AND ENGINEERING SCIENCES IN MEDICINE 
ISSN
 2662-4729 
Issue Date
2020-09
Keywords
Couch effect ; Dosimetric leaf gap ; Mobius ; Mobius verification phantom
Abstract
This study assesses the dosimetric leaf gap (DLG) correction factor in Mobius3D commissioning affected by a couch top platform and calculates the optimal DLG value according to the point dose difference function. DLG optimizations were performed for 3 LINAC machines and a total of 30 patient volumetric modulated arc therapy plans (i.e., 10 plans per each LINAC). Point dose calculations were performed using an automatic dose calculation system in Mobius3D as well as Mobis3D calculation using a Mobius Verification Phantom (MVP)-based quality assurance plan with a carbon fiber couch top. Subsequently, the results were compared with measurement data. The averaged point dose measured for the MVP with a couch top decreased by approximately 2% relative to that without the couch top. The average of the optimal DLG factors increased by 1.153 mm due to the couch top effect for a dose decrease of 2% at the measured point. In the procedure of Mobius beam commissioning, users should adjust the DLG correction factor using a specific phantom (including MVP) with a couch top structure. If the DLG optimization were performed by using MVP automatic dose calculation system, the factor should be increased by approximately 1.2 mm per 2% dose difference considering user's couch top effect.
Full Text
https://link.springer.com/article/10.1007/s13246-020-00905-z
DOI
10.1007/s13246-020-00905-z
Appears in Collections:
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, Jihun(김지훈) ORCID logo https://orcid.org/0000-0003-4856-6305
Kim, Jinsung(김진성) ORCID logo https://orcid.org/0000-0003-1415-6471
Park, Kwang Woo(박광우) ORCID logo https://orcid.org/0000-0002-9843-7985
Chang, Kyung Hwan(장경환)
Han, Min Cheol(한민철)
Han, Su Chul(한수철)
Hong, Chae-Seon(홍채선) ORCID logo https://orcid.org/0000-0001-9120-6132
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/180353
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