Dosimetric characteristics of 6MV flattening filter free and flattened beams among beam-matched linacs: a three-institutional study
Abstract Background Beam matching is a concept in radiotherapy applied to clinics where more than one linac is employed to harmonise beam characteristics across linacs for allowing patients interchange without replanning. In view of this, the current study analyzes and compares dosimetric characteri...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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BMC
2023-07-01
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| Series: | Radiation Oncology |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s13014-023-02313-5 |
| _version_ | 1797769352594849792 |
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| author | Diana M. Ghemiș Loredana G. Marcu Vasile Virag Adriana Virag |
| author_facet | Diana M. Ghemiș Loredana G. Marcu Vasile Virag Adriana Virag |
| author_sort | Diana M. Ghemiș |
| collection | DOAJ |
| description | Abstract Background Beam matching is a concept in radiotherapy applied to clinics where more than one linac is employed to harmonise beam characteristics across linacs for allowing patients interchange without replanning. In view of this, the current study analyzes and compares dosimetric characteristics of 6MV flattening filter free and flattened beams of three beam-matched linear accelerators (linacs) from three different clinics with the aim to evaluate the matching under tight criteria for gamma analysis. Methods Three Elekta linacs from three different clinics were included. The linacs have the same collimator assembly, Elekta Agility. Beam data were collected during commissioning process using PTW dosimetry systems. Dose profiles and percentage depth doses (PDD) were analyzed using 1D gamma analysis (1 mm/1%) as well as the following parameters: depth of maximum dose, PDD10, flatness, unflattnes, symmetry, penumbra, output factors. Additionally, five stereotactic treatment plans were optimized in one clinic and calculated by all three planning systems (Monaco) for a dosimetric comparison. Results Gamma analysis of dose profiles and PDDs showed clinically acceptable results of 96.3% passing rate for profiles and 100% passing rate for PDDs. All dosimetric parameters were in good agreement with the reference data. Furthermore, dosimetric comparisons between stereotactic treatment plans showed a maximum standard deviation of 0.48 Gy for the maximum dose to PTV, and a maximum standard deviation of 0.1 Gy for the dose to the organs at risk. Conclusions All three linacs showed a strong agreement between parameters and passed the gamma analysis using 1% DD/1mm DTA criteria. This study confirmed the matching between linacs, offering the possibility to interchange patients with no replanning. |
| first_indexed | 2024-03-12T21:07:48Z |
| format | Article |
| id | doaj.art-31a7d30357b6444da60c6b8a3fb618e9 |
| institution | Directory Open Access Journal |
| issn | 1748-717X |
| language | English |
| last_indexed | 2024-03-12T21:07:48Z |
| publishDate | 2023-07-01 |
| publisher | BMC |
| record_format | Article |
| series | Radiation Oncology |
| spelling | doaj.art-31a7d30357b6444da60c6b8a3fb618e92023-07-30T11:21:22ZengBMCRadiation Oncology1748-717X2023-07-0118111110.1186/s13014-023-02313-5Dosimetric characteristics of 6MV flattening filter free and flattened beams among beam-matched linacs: a three-institutional studyDiana M. Ghemiș0Loredana G. Marcu1Vasile Virag2Adriana Virag3Faculty of Physics, West University of TimisoaraFaculty of Physics, West University of TimisoaraMedEuropaMedEuropaAbstract Background Beam matching is a concept in radiotherapy applied to clinics where more than one linac is employed to harmonise beam characteristics across linacs for allowing patients interchange without replanning. In view of this, the current study analyzes and compares dosimetric characteristics of 6MV flattening filter free and flattened beams of three beam-matched linear accelerators (linacs) from three different clinics with the aim to evaluate the matching under tight criteria for gamma analysis. Methods Three Elekta linacs from three different clinics were included. The linacs have the same collimator assembly, Elekta Agility. Beam data were collected during commissioning process using PTW dosimetry systems. Dose profiles and percentage depth doses (PDD) were analyzed using 1D gamma analysis (1 mm/1%) as well as the following parameters: depth of maximum dose, PDD10, flatness, unflattnes, symmetry, penumbra, output factors. Additionally, five stereotactic treatment plans were optimized in one clinic and calculated by all three planning systems (Monaco) for a dosimetric comparison. Results Gamma analysis of dose profiles and PDDs showed clinically acceptable results of 96.3% passing rate for profiles and 100% passing rate for PDDs. All dosimetric parameters were in good agreement with the reference data. Furthermore, dosimetric comparisons between stereotactic treatment plans showed a maximum standard deviation of 0.48 Gy for the maximum dose to PTV, and a maximum standard deviation of 0.1 Gy for the dose to the organs at risk. Conclusions All three linacs showed a strong agreement between parameters and passed the gamma analysis using 1% DD/1mm DTA criteria. This study confirmed the matching between linacs, offering the possibility to interchange patients with no replanning.https://doi.org/10.1186/s13014-023-02313-5Beam matched linacsFFF beamDosimetryCommissioning |
| spellingShingle | Diana M. Ghemiș Loredana G. Marcu Vasile Virag Adriana Virag Dosimetric characteristics of 6MV flattening filter free and flattened beams among beam-matched linacs: a three-institutional study Radiation Oncology Beam matched linacs FFF beam Dosimetry Commissioning |
| title | Dosimetric characteristics of 6MV flattening filter free and flattened beams among beam-matched linacs: a three-institutional study |
| title_full | Dosimetric characteristics of 6MV flattening filter free and flattened beams among beam-matched linacs: a three-institutional study |
| title_fullStr | Dosimetric characteristics of 6MV flattening filter free and flattened beams among beam-matched linacs: a three-institutional study |
| title_full_unstemmed | Dosimetric characteristics of 6MV flattening filter free and flattened beams among beam-matched linacs: a three-institutional study |
| title_short | Dosimetric characteristics of 6MV flattening filter free and flattened beams among beam-matched linacs: a three-institutional study |
| title_sort | dosimetric characteristics of 6mv flattening filter free and flattened beams among beam matched linacs a three institutional study |
| topic | Beam matched linacs FFF beam Dosimetry Commissioning |
| url | https://doi.org/10.1186/s13014-023-02313-5 |
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