Feasibility Study of Transit Dosimetry (TD) with an Electronic Portal Imaging Device (EPID) in volumetric arc therapy (VMAT) for head and neck cancer (HNC)
Introduction: The progress in radiotherapy treatment modalities, such as Intensity Modulated Radiotherapy (IMRT) and Volumetric Arc Therapy (VMAT), introduces considerable complexity. Consequently, the precision of dose delivery in treatment becomes crucial. This dosimetric investigation aims to int...
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Mashhad University of Medical Sciences
2025-02-01
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| Series: | Iranian Journal of Medical Physics |
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| Online Access: | https://ijmp.mums.ac.ir/article_25901_50ee661d233fff13592ab9846bf574e9.pdf |
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| author | ARVIND DIUNDI KIRAN SHARMA CHANDI BHATT SANGEETA HAZARIKA |
| author_facet | ARVIND DIUNDI KIRAN SHARMA CHANDI BHATT SANGEETA HAZARIKA |
| author_sort | ARVIND DIUNDI |
| collection | DOAJ |
| description | Introduction: The progress in radiotherapy treatment modalities, such as Intensity Modulated Radiotherapy (IMRT) and Volumetric Arc Therapy (VMAT), introduces considerable complexity. Consequently, the precision of dose delivery in treatment becomes crucial. This dosimetric investigation aims to integrate transit dosimetry into routine clinical procedures and assess outcomes using the gamma analysis methodology.Material and Methods: This dosimetric investigation selected a cohort comprising 30 patients diagnosed with head and neck cancer (HNC) and treated using TruebeamTM & HalcyonTM medical linear accelerators (Varian Medical Systems, Palo Alto, CA). Nine hundred forty-two treatment fluence maps were generated using transit dosimetry and evaluated with gamma analysis. The dosimetry was performed using amorphous silicon (a-Si 1000 and a-Si 1200) electronic portal imaging devices (EPIDs), with gamma analysis criteria of 2% dose difference (DD) and 2 mm distance to agreement (DTA), as well as 3% DD and 3 mm DTA.Results: Daily treatment consistency was assessed by establishing the initial-day fluence as the reference for the entire treatment regimen. In all instances, it was observed that the area gamma value was <1, exceeding 95% compliance when applying the 2%, 2 mm, and 3%, 3 mm criteria. This indicates a favourable agreement between the fluence of the reference day and subsequent treatment sessions throughout the course of treatment.Conclusion: The findings of this dosimetric investigation demonstrate the successful integration of transit dosimetry into routine clinical procedures, providing assurance in dose verification without imparting additional doses to patients. Consequently, this dosimetric approach exhibits potential efficacy for dose verification purposes within clinical settings. |
| format | Article |
| id | doaj-art-cc8145eace7f419e8aa0e04a7fe389f0 |
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| language | English |
| publishDate | 2025-02-01 |
| publisher | Mashhad University of Medical Sciences |
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| series | Iranian Journal of Medical Physics |
| spelling | doaj-art-cc8145eace7f419e8aa0e04a7fe389f02025-08-20T02:12:15ZengMashhad University of Medical SciencesIranian Journal of Medical Physics2345-36722025-02-01221283510.22038/ijmp.2025.78427.238725901Feasibility Study of Transit Dosimetry (TD) with an Electronic Portal Imaging Device (EPID) in volumetric arc therapy (VMAT) for head and neck cancer (HNC)ARVIND DIUNDI0KIRAN SHARMA1CHANDI BHATT2SANGEETA HAZARIKA3Department of Radiation Oncology, All India Institute of Medical Sciences, Rishikesh, Uttarakhand, IndiaGraphic Era Deemed to be University, Dehradun, Uttarakhand, IndiaSarvodaya Hospital & Research Centre, Faridabad (Delhi/NCR), India 121006Department of Radiation Oncology, All India Institute of Medical Sciences (AIIMS), Rishikesh, Uttarakhand, IndiaIntroduction: The progress in radiotherapy treatment modalities, such as Intensity Modulated Radiotherapy (IMRT) and Volumetric Arc Therapy (VMAT), introduces considerable complexity. Consequently, the precision of dose delivery in treatment becomes crucial. This dosimetric investigation aims to integrate transit dosimetry into routine clinical procedures and assess outcomes using the gamma analysis methodology.Material and Methods: This dosimetric investigation selected a cohort comprising 30 patients diagnosed with head and neck cancer (HNC) and treated using TruebeamTM & HalcyonTM medical linear accelerators (Varian Medical Systems, Palo Alto, CA). Nine hundred forty-two treatment fluence maps were generated using transit dosimetry and evaluated with gamma analysis. The dosimetry was performed using amorphous silicon (a-Si 1000 and a-Si 1200) electronic portal imaging devices (EPIDs), with gamma analysis criteria of 2% dose difference (DD) and 2 mm distance to agreement (DTA), as well as 3% DD and 3 mm DTA.Results: Daily treatment consistency was assessed by establishing the initial-day fluence as the reference for the entire treatment regimen. In all instances, it was observed that the area gamma value was <1, exceeding 95% compliance when applying the 2%, 2 mm, and 3%, 3 mm criteria. This indicates a favourable agreement between the fluence of the reference day and subsequent treatment sessions throughout the course of treatment.Conclusion: The findings of this dosimetric investigation demonstrate the successful integration of transit dosimetry into routine clinical procedures, providing assurance in dose verification without imparting additional doses to patients. Consequently, this dosimetric approach exhibits potential efficacy for dose verification purposes within clinical settings.https://ijmp.mums.ac.ir/article_25901_50ee661d233fff13592ab9846bf574e9.pdftransit dosimetry invivo dosimetry gamma analysis epid |
| spellingShingle | ARVIND DIUNDI KIRAN SHARMA CHANDI BHATT SANGEETA HAZARIKA Feasibility Study of Transit Dosimetry (TD) with an Electronic Portal Imaging Device (EPID) in volumetric arc therapy (VMAT) for head and neck cancer (HNC) Iranian Journal of Medical Physics transit dosimetry in vivo dosimetry gamma analysis epid |
| title | Feasibility Study of Transit Dosimetry (TD) with an Electronic Portal Imaging Device (EPID) in volumetric arc therapy (VMAT) for head and neck cancer (HNC) |
| title_full | Feasibility Study of Transit Dosimetry (TD) with an Electronic Portal Imaging Device (EPID) in volumetric arc therapy (VMAT) for head and neck cancer (HNC) |
| title_fullStr | Feasibility Study of Transit Dosimetry (TD) with an Electronic Portal Imaging Device (EPID) in volumetric arc therapy (VMAT) for head and neck cancer (HNC) |
| title_full_unstemmed | Feasibility Study of Transit Dosimetry (TD) with an Electronic Portal Imaging Device (EPID) in volumetric arc therapy (VMAT) for head and neck cancer (HNC) |
| title_short | Feasibility Study of Transit Dosimetry (TD) with an Electronic Portal Imaging Device (EPID) in volumetric arc therapy (VMAT) for head and neck cancer (HNC) |
| title_sort | feasibility study of transit dosimetry td with an electronic portal imaging device epid in volumetric arc therapy vmat for head and neck cancer hnc |
| topic | transit dosimetry in vivo dosimetry gamma analysis epid |
| url | https://ijmp.mums.ac.ir/article_25901_50ee661d233fff13592ab9846bf574e9.pdf |
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