Evaluation of a Scintillating Plastic Optical Fiber Device for Measuring kV-Cone Beam Computed Tomography Dose
Background: Justification of imaging procedures such as cone beam computed tomography (CBCT) in radiotherapy makes no doubt. However, the CBCT composite dose is rarely reported or optimized, even though the repeated CBCT cumulative dose can be up to 3% of the prescription dose. This study aimed to e...
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| Format: | Article |
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MDPI AG
2023-09-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/18/7778 |
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| author | Christian Popotte Romain Letellier Didier Paul Alexandre Waltener Nicolas Guillochon Mélodie Munier Paul Retif |
| author_facet | Christian Popotte Romain Letellier Didier Paul Alexandre Waltener Nicolas Guillochon Mélodie Munier Paul Retif |
| author_sort | Christian Popotte |
| collection | DOAJ |
| description | Background: Justification of imaging procedures such as cone beam computed tomography (CBCT) in radiotherapy makes no doubt. However, the CBCT composite dose is rarely reported or optimized, even though the repeated CBCT cumulative dose can be up to 3% of the prescription dose. This study aimed to evaluate the performance and utility of a new plastic scintillating optical fiber dosimeter for CBCT dosimetric quality assurance (QA) applications before a potential application in patient composite CBCT dosimetry. Methods: The dosimeter, made of 1 mm diameter plastic fiber, was installed under a linear accelerator treatment table and linked to photodetectors. The fiber impact on the fluence and dose delivered was respectively assessed with an electronic portal imaging device (EPID) and EBT3 Gafchromic<sup>®</sup> film. The presence of artifacts was visually evaluated on kV images. The dosimeter performances were determined for various acquisition parameters by comparison with ionization chamber values. Results: The maximum impact of the fiber on the fluence measured by the EPID was −1.2% for the 6 MV flattening filter-free beam. However, the fiber did not alter the film dose profile when measured for all the beams tested. The fiber was not visible at energies ≥ 80 kV and was merely visible on the CBCT images. When the rate of images per second or mA was changed, the maximum relative difference between the device and the ionization chamber CTDIs was <5%. Changing collimation led to a −7.2% maximum relative difference with an absolute dose difference that was insignificant (−0.3 mGy). Changing kV was associated with a −8.7% maximum relative difference, as published in the literature. Conclusions: The dosimeter may be a promising device for CBCT recurrent dosimetry quality control or dose optimization. According to these results, further developments are in progress in order to adapt the solution to the measurement of patient composite CBCT doses. |
| first_indexed | 2024-03-10T22:02:28Z |
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| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T22:02:28Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-852f46640348417cb3d355e15f4fe4982023-11-19T12:54:05ZengMDPI AGSensors1424-82202023-09-012318777810.3390/s23187778Evaluation of a Scintillating Plastic Optical Fiber Device for Measuring kV-Cone Beam Computed Tomography DoseChristian Popotte0Romain Letellier1Didier Paul2Alexandre Waltener3Nicolas Guillochon4Mélodie Munier5Paul Retif6INSERM Unité U1296 Radiations: Défense, Santé Environnement, 69008 Lyon, FranceMedical Physics Unit, CHR Metz-Thionville, 57000 Metz, FranceINSERM Unité U1296 Radiations: Défense, Santé Environnement, 69008 Lyon, FranceMedical Physics Unit, CHR Metz-Thionville, 57000 Metz, FranceFibermetrix, 7 Allée de l’Europe, 67960 Entzheim, FranceINSERM Unité U1296 Radiations: Défense, Santé Environnement, 69008 Lyon, FranceMedical Physics Unit, CHR Metz-Thionville, 57000 Metz, FranceBackground: Justification of imaging procedures such as cone beam computed tomography (CBCT) in radiotherapy makes no doubt. However, the CBCT composite dose is rarely reported or optimized, even though the repeated CBCT cumulative dose can be up to 3% of the prescription dose. This study aimed to evaluate the performance and utility of a new plastic scintillating optical fiber dosimeter for CBCT dosimetric quality assurance (QA) applications before a potential application in patient composite CBCT dosimetry. Methods: The dosimeter, made of 1 mm diameter plastic fiber, was installed under a linear accelerator treatment table and linked to photodetectors. The fiber impact on the fluence and dose delivered was respectively assessed with an electronic portal imaging device (EPID) and EBT3 Gafchromic<sup>®</sup> film. The presence of artifacts was visually evaluated on kV images. The dosimeter performances were determined for various acquisition parameters by comparison with ionization chamber values. Results: The maximum impact of the fiber on the fluence measured by the EPID was −1.2% for the 6 MV flattening filter-free beam. However, the fiber did not alter the film dose profile when measured for all the beams tested. The fiber was not visible at energies ≥ 80 kV and was merely visible on the CBCT images. When the rate of images per second or mA was changed, the maximum relative difference between the device and the ionization chamber CTDIs was <5%. Changing collimation led to a −7.2% maximum relative difference with an absolute dose difference that was insignificant (−0.3 mGy). Changing kV was associated with a −8.7% maximum relative difference, as published in the literature. Conclusions: The dosimeter may be a promising device for CBCT recurrent dosimetry quality control or dose optimization. According to these results, further developments are in progress in order to adapt the solution to the measurement of patient composite CBCT doses.https://www.mdpi.com/1424-8220/23/18/7778CBCTIGRTscintillating dosimetryoptical fiber |
| spellingShingle | Christian Popotte Romain Letellier Didier Paul Alexandre Waltener Nicolas Guillochon Mélodie Munier Paul Retif Evaluation of a Scintillating Plastic Optical Fiber Device for Measuring kV-Cone Beam Computed Tomography Dose Sensors CBCT IGRT scintillating dosimetry optical fiber |
| title | Evaluation of a Scintillating Plastic Optical Fiber Device for Measuring kV-Cone Beam Computed Tomography Dose |
| title_full | Evaluation of a Scintillating Plastic Optical Fiber Device for Measuring kV-Cone Beam Computed Tomography Dose |
| title_fullStr | Evaluation of a Scintillating Plastic Optical Fiber Device for Measuring kV-Cone Beam Computed Tomography Dose |
| title_full_unstemmed | Evaluation of a Scintillating Plastic Optical Fiber Device for Measuring kV-Cone Beam Computed Tomography Dose |
| title_short | Evaluation of a Scintillating Plastic Optical Fiber Device for Measuring kV-Cone Beam Computed Tomography Dose |
| title_sort | evaluation of a scintillating plastic optical fiber device for measuring kv cone beam computed tomography dose |
| topic | CBCT IGRT scintillating dosimetry optical fiber |
| url | https://www.mdpi.com/1424-8220/23/18/7778 |
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