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TomoEQA: Dose verification for patient-specific quality assurance in helical tomotherapy using an exit detector

Authors
 Min Cheol Han  ;  Kyung Hwan Chang  ;  Jihun Kim  ;  Su Chul Han  ;  Kwangwoo Park  ;  Dong Wook Kim  ;  Hojin Kim  ;  Jin Sung Kim 
Citation
 PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS, Vol.82 : 1-6, 2021-02 
Journal Title
 PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS 
ISSN
 1120-1797 
Issue Date
2021-02
Keywords
Helical tomotherapy ; Leaf open time ; Mobius3D ; Patient-specific quality assurance ; Phantom-less quality assurance
Abstract
Purpose: Existing phantom-less quality assurance (QA) platforms does not provide patient-specific QA for helical tomotherapy (HT). A new system, called TomoEQA, is presented to facilitate this using the leaf open time (LOT) of a binary multi-leaf collimator, as measured by an exit detector. Methods: TomoEQA was designed to provide measurement-based LOTs based on detector data and to generate a new digital imaging and communication in medicine (DICOM) dataset that includes the measured LOTs for use by secondary check platforms. To evaluate the system, 20 patient-specific QAs were performed using the program in Mobius3D software, and the results were compared to conventional phantom-based QA results. Results: From our assessment, most of the differences between the planned and measured (or calculated) data, excluding one case, were within the acceptance criteria comparing with those of conventional QA. Regarding the gamma analysis, all results considered in this study were within the acceptance criteria. In addition, the developed system was performed for a failed case and showed approximately the same trends as the conventional approach. Conclusions: TomoEQA could perform patient-specific QAs of HT using Mobius3D and provide reliable patient-specific QAs results by evaluating point dose errors and 3D gamma passing rates. TomoEQA could also distinguish whether an intensity-modulated radiation therapy plan failed or not.
Full Text
https://www.sciencedirect.com/science/article/pii/S1120179720303367
DOI
10.1016/j.ejmp.2020.12.021
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
Kim, Hojin(김호진)
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)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/182454
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