Physical wedge as a tool for radiochromic film calibration
Reliable calibration is one of the major challenges in using radiochromic films (RCF) for radiation dosimetry. In this study the feasibility of using dose gradients produced by a physical wedge (PW) for RCF calibration was investigated. The aim was to establish an efficient and reproducible method f...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-05-01
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| Series: | Zeitschrift für Medizinische Physik |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0939388923000776 |
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| author | Stevan Pecić Miloš Vićić Ivan Belča Strahinja Stojadinović Borko Nidžović Ljubomir Kurij Slobodan Dević |
| author_facet | Stevan Pecić Miloš Vićić Ivan Belča Strahinja Stojadinović Borko Nidžović Ljubomir Kurij Slobodan Dević |
| author_sort | Stevan Pecić |
| collection | DOAJ |
| description | Reliable calibration is one of the major challenges in using radiochromic films (RCF) for radiation dosimetry. In this study the feasibility of using dose gradients produced by a physical wedge (PW) for RCF calibration was investigated. The aim was to establish an efficient and reproducible method for calibrating RCF using a PW. Film strips were used to capture the wedge dose profile for five different exposures and the acquired scans were processed to generate corresponding net optical density wedge profiles. The proposed method was compared to the benchmark calibration, following the guidelines for precise calibration using uniform dose fields. The results of the benchmark comparison presented in this paper showed that using a single film strip for measuring wedge dose profile is sufficient for estimating a reliable calibration curve within the recorded dose range. Furthermore, the PW calibration can be extrapolated or extended by using multiple gradients for the optimal coverage of the desired calibration dose range. The method outlined in this paper can be readily replicated using the equipment and expertise commonly found in a radiotherapy center. Once the dose profile and central axis attenuation coefficient of the PW are determined, they can serve as a reference for a variety of calibrations using different types and batches of film. This investigation demonstrated that the calibration curves obtained with the presented PW calibration method are within the bounds of the measurement uncertainty evaluated for the conventional uniform dose field calibration method. |
| format | Article |
| id | doaj-art-0796b8512ea54b1885126ef23d3b66b2 |
| institution | OA Journals |
| issn | 0939-3889 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Zeitschrift für Medizinische Physik |
| spelling | doaj-art-0796b8512ea54b1885126ef23d3b66b22025-08-20T01:52:22ZengElsevierZeitschrift für Medizinische Physik0939-38892025-05-0135216116810.1016/j.zemedi.2023.05.008Physical wedge as a tool for radiochromic film calibrationStevan Pecić0Miloš Vićić1Ivan Belča2Strahinja Stojadinović3Borko Nidžović4Ljubomir Kurij5Slobodan Dević6Faculty of Physics, University of Belgrade, Studentski trg 12-16, Belgrade 11000, Serbia; Corresponding author: Stevan Pecić, Faculty of Physics, University of Belgrade, Studentski Trg 12-16, 11000 Belgrade, Serbia.Faculty of Physics, University of Belgrade, Studentski trg 12-16, Belgrade 11000, SerbiaFaculty of Physics, University of Belgrade, Studentski trg 12-16, Belgrade 11000, SerbiaDepartment of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas 75390, TX, United StatesInstitute of Oncology and Radiology of Serbia, Pasterova 14, Belgrade 11000, SerbiaUniversity Clinical Center of Serbia, Center for Neurooncology, Gamma Knife, Koste Todorovića 4, Belgrade 11000, SerbiaMedical Physics Unit, McGill University, Montreal H4A 3J1, QC, Canada; Department of Radiation Oncology, SMBD Jewish General Hospital, Montreal H3T 1E2, QC, CanadaReliable calibration is one of the major challenges in using radiochromic films (RCF) for radiation dosimetry. In this study the feasibility of using dose gradients produced by a physical wedge (PW) for RCF calibration was investigated. The aim was to establish an efficient and reproducible method for calibrating RCF using a PW. Film strips were used to capture the wedge dose profile for five different exposures and the acquired scans were processed to generate corresponding net optical density wedge profiles. The proposed method was compared to the benchmark calibration, following the guidelines for precise calibration using uniform dose fields. The results of the benchmark comparison presented in this paper showed that using a single film strip for measuring wedge dose profile is sufficient for estimating a reliable calibration curve within the recorded dose range. Furthermore, the PW calibration can be extrapolated or extended by using multiple gradients for the optimal coverage of the desired calibration dose range. The method outlined in this paper can be readily replicated using the equipment and expertise commonly found in a radiotherapy center. Once the dose profile and central axis attenuation coefficient of the PW are determined, they can serve as a reference for a variety of calibrations using different types and batches of film. This investigation demonstrated that the calibration curves obtained with the presented PW calibration method are within the bounds of the measurement uncertainty evaluated for the conventional uniform dose field calibration method.http://www.sciencedirect.com/science/article/pii/S0939388923000776Radiochromic film dosimetryEBT3CalibrationDose gradientsPhysical wedge |
| spellingShingle | Stevan Pecić Miloš Vićić Ivan Belča Strahinja Stojadinović Borko Nidžović Ljubomir Kurij Slobodan Dević Physical wedge as a tool for radiochromic film calibration Zeitschrift für Medizinische Physik Radiochromic film dosimetry EBT3 Calibration Dose gradients Physical wedge |
| title | Physical wedge as a tool for radiochromic film calibration |
| title_full | Physical wedge as a tool for radiochromic film calibration |
| title_fullStr | Physical wedge as a tool for radiochromic film calibration |
| title_full_unstemmed | Physical wedge as a tool for radiochromic film calibration |
| title_short | Physical wedge as a tool for radiochromic film calibration |
| title_sort | physical wedge as a tool for radiochromic film calibration |
| topic | Radiochromic film dosimetry EBT3 Calibration Dose gradients Physical wedge |
| url | http://www.sciencedirect.com/science/article/pii/S0939388923000776 |
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