Evaluation of a complementary metal oxide semiconductor detector as a tool for stereotactic body radiotherapy plan quality assurance
Background and purpose: A sub-mm resolution Complementary Metal Oxide Semiconductor sensor has been developed for stereotactic radiotherapy quality assurance. Herein we evaluate its basic dosimetric performance and its application for linac C-arm stereotactic body radiotherapy (SBRT) plan quality as...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-01-01
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| Series: | Physics and Imaging in Radiation Oncology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S240563162300009X |
| _version_ | 1827990083579412480 |
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| author | Chris J. Stepanek Jackie A. Haynes Sally Fletcher |
| author_facet | Chris J. Stepanek Jackie A. Haynes Sally Fletcher |
| author_sort | Chris J. Stepanek |
| collection | DOAJ |
| description | Background and purpose: A sub-mm resolution Complementary Metal Oxide Semiconductor sensor has been developed for stereotactic radiotherapy quality assurance. Herein we evaluate its basic dosimetric performance and its application for linac C-arm stereotactic body radiotherapy (SBRT) plan quality assurance. Materials and methods: The detector was integrated into its accompanying phantom or in Water Equivalent Plastic (WEP). The measurement reproducibility, stability, dose linearity and dependence on angularity, dose rate and field size were investigated. Clinical plan measurements were compared to our radiotherapy treatment planning system and radiochromic film. Sensitivity to introduced Multi Leaf Collimator (MLC) offsets was evaluated by simulating single MLC offsets in SBRT plans and comparing measurements to expected doses. Results: Signal reproducibility was within ± 0.1 % and output calibration was stable over a 6 month period. Detector showed good linearity with dose (r2 = 1). Signal decreased by 5 % when dose rate was decreased from 1300 MU/min to 300 MU/min. Output factors agreed within 0.5 % of chamber measurements for 1x1 cm field sizes or greater. Angularity measurements showed good agreement with reference. For measurement of planned clinical doses, gamma pass-rates were 98.5 % ± 2.3 % (treatment planning system reference, 2 %/2mm) and 99.2 % ± 1.0 % (film reference, 2 %,2mm). The detector also showed sensitivity to errors of 1 mm offsets in MLC positioning. Conclusion: The detector performed well when used for pre-treatment SBRT plan quality assurance, offering a good alternative to radiochromic film. |
| first_indexed | 2024-04-10T00:30:10Z |
| format | Article |
| id | doaj.art-b37823b33eed4e22a5ad0e7482ad8caf |
| institution | Directory Open Access Journal |
| issn | 2405-6316 |
| language | English |
| last_indexed | 2024-04-10T00:30:10Z |
| publishDate | 2023-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics and Imaging in Radiation Oncology |
| spelling | doaj.art-b37823b33eed4e22a5ad0e7482ad8caf2023-03-15T04:28:41ZengElsevierPhysics and Imaging in Radiation Oncology2405-63162023-01-0125100418Evaluation of a complementary metal oxide semiconductor detector as a tool for stereotactic body radiotherapy plan quality assuranceChris J. Stepanek0Jackie A. Haynes1Sally Fletcher2Corresponding author.; Department of Radiotherapy, Bristol Haematology & Oncology Centre, University Hospitals Bristol & Weston NHS Foundation Trust, Horfield Road, Bristol BS2 8ED, United KingdomDepartment of Radiotherapy, Bristol Haematology & Oncology Centre, University Hospitals Bristol & Weston NHS Foundation Trust, Horfield Road, Bristol BS2 8ED, United KingdomDepartment of Radiotherapy, Bristol Haematology & Oncology Centre, University Hospitals Bristol & Weston NHS Foundation Trust, Horfield Road, Bristol BS2 8ED, United KingdomBackground and purpose: A sub-mm resolution Complementary Metal Oxide Semiconductor sensor has been developed for stereotactic radiotherapy quality assurance. Herein we evaluate its basic dosimetric performance and its application for linac C-arm stereotactic body radiotherapy (SBRT) plan quality assurance. Materials and methods: The detector was integrated into its accompanying phantom or in Water Equivalent Plastic (WEP). The measurement reproducibility, stability, dose linearity and dependence on angularity, dose rate and field size were investigated. Clinical plan measurements were compared to our radiotherapy treatment planning system and radiochromic film. Sensitivity to introduced Multi Leaf Collimator (MLC) offsets was evaluated by simulating single MLC offsets in SBRT plans and comparing measurements to expected doses. Results: Signal reproducibility was within ± 0.1 % and output calibration was stable over a 6 month period. Detector showed good linearity with dose (r2 = 1). Signal decreased by 5 % when dose rate was decreased from 1300 MU/min to 300 MU/min. Output factors agreed within 0.5 % of chamber measurements for 1x1 cm field sizes or greater. Angularity measurements showed good agreement with reference. For measurement of planned clinical doses, gamma pass-rates were 98.5 % ± 2.3 % (treatment planning system reference, 2 %/2mm) and 99.2 % ± 1.0 % (film reference, 2 %,2mm). The detector also showed sensitivity to errors of 1 mm offsets in MLC positioning. Conclusion: The detector performed well when used for pre-treatment SBRT plan quality assurance, offering a good alternative to radiochromic film.http://www.sciencedirect.com/science/article/pii/S240563162300009XStereotactic body radiotherapyQuality assuranceSpatial resolutionDosimetric characterisationClinical dose measurementDelivery error sensitivity |
| spellingShingle | Chris J. Stepanek Jackie A. Haynes Sally Fletcher Evaluation of a complementary metal oxide semiconductor detector as a tool for stereotactic body radiotherapy plan quality assurance Physics and Imaging in Radiation Oncology Stereotactic body radiotherapy Quality assurance Spatial resolution Dosimetric characterisation Clinical dose measurement Delivery error sensitivity |
| title | Evaluation of a complementary metal oxide semiconductor detector as a tool for stereotactic body radiotherapy plan quality assurance |
| title_full | Evaluation of a complementary metal oxide semiconductor detector as a tool for stereotactic body radiotherapy plan quality assurance |
| title_fullStr | Evaluation of a complementary metal oxide semiconductor detector as a tool for stereotactic body radiotherapy plan quality assurance |
| title_full_unstemmed | Evaluation of a complementary metal oxide semiconductor detector as a tool for stereotactic body radiotherapy plan quality assurance |
| title_short | Evaluation of a complementary metal oxide semiconductor detector as a tool for stereotactic body radiotherapy plan quality assurance |
| title_sort | evaluation of a complementary metal oxide semiconductor detector as a tool for stereotactic body radiotherapy plan quality assurance |
| topic | Stereotactic body radiotherapy Quality assurance Spatial resolution Dosimetric characterisation Clinical dose measurement Delivery error sensitivity |
| url | http://www.sciencedirect.com/science/article/pii/S240563162300009X |
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