ON THE CORRECTION OF DOSE PROFILE DISCREPANCIES BY INTRODUCING AIR IN THE DERIVATION OF AN ELECTRON SPECTRUM
Knowledge of the energy spectrum of an electron beam is relevant for accurate dose calculation in radiotherapy. In previous works, it has been possible to reconstruct the electron spectrum of various clinical energies (6, 9, 12 and 15 MeV) within the typical percentage of clinical acceptance (Pa &am...
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| Format: | Online |
| Language: | eng |
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Universidad Pedagógica y Tecnológica de Colombia - UPTC
2023
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| Online Access: | https://revistas.uptc.edu.co/index.php/ingenieria_sogamoso/article/view/14751 |
| _version_ | 1801706697020932096 |
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| author | Wilches Visbal, Jorge Homero |
| author_facet | Wilches Visbal, Jorge Homero |
| author_sort | Wilches Visbal, Jorge Homero |
| collection | OJS |
| description | Knowledge of the energy spectrum of an electron beam is relevant for accurate dose calculation in radiotherapy. In previous works, it has been possible to reconstruct the electron spectrum of various clinical energies (6, 9, 12 and 15 MeV) within the typical percentage of clinical acceptance (Pa > 95 %) according to the gamma index (GI) (2 %/2mm), for both depth dose percentages (PDD) and dose profiles (DP), except for 6 MeV profiles. Therefore, the purpose of this work was to introduce air between the radiation source and the phantom surface to simulate both the monoenergetic PDDs necessary in the reconstruction of the spectrum of a 6 MeV beam and to obtain the PDD of this spectrum. Validation was performed using the gamma index with the typical threshold for clinical acceptance. The results showed that the PDP of the vacuum spectrum had a better agreement than the PDP of the air spectrum (Pa = 100 %), with respect to the measured PDD (Pa = 97 %). Regarding the PD, the introduction of air improved the agreement in clinical interest but not enough to reach the acceptance percentage. It is concluded that this technique does not seem to be a good alternative to correct the discrepancies in the field edges between the DP of an inversely reconstructed spectrum and the measured DP. |
| format | Online |
| id | oai:oai.revistas.uptc.edu.co:article-14751 |
| institution | Revista Ingeniería, Investigación y Desarrollo |
| language | eng |
| publishDate | 2023 |
| publisher | Universidad Pedagógica y Tecnológica de Colombia - UPTC |
| record_format | ojs |
| spelling | oai:oai.revistas.uptc.edu.co:article-147512023-07-07T14:42:46Z ON THE CORRECTION OF DOSE PROFILE DISCREPANCIES BY INTRODUCING AIR IN THE DERIVATION OF AN ELECTRON SPECTRUM ON THE CORRECTION OF DOSE PROFILE DISCREPANCIES BY INTRODUCING AIR IN THE DERIVATION OF AN ELECTRON SPECTRUM Wilches Visbal, Jorge Homero inverse reconstruction electrons air gamma index dose profile Knowledge of the energy spectrum of an electron beam is relevant for accurate dose calculation in radiotherapy. In previous works, it has been possible to reconstruct the electron spectrum of various clinical energies (6, 9, 12 and 15 MeV) within the typical percentage of clinical acceptance (Pa > 95 %) according to the gamma index (GI) (2 %/2mm), for both depth dose percentages (PDD) and dose profiles (DP), except for 6 MeV profiles. Therefore, the purpose of this work was to introduce air between the radiation source and the phantom surface to simulate both the monoenergetic PDDs necessary in the reconstruction of the spectrum of a 6 MeV beam and to obtain the PDD of this spectrum. Validation was performed using the gamma index with the typical threshold for clinical acceptance. The results showed that the PDP of the vacuum spectrum had a better agreement than the PDP of the air spectrum (Pa = 100 %), with respect to the measured PDD (Pa = 97 %). Regarding the PD, the introduction of air improved the agreement in clinical interest but not enough to reach the acceptance percentage. It is concluded that this technique does not seem to be a good alternative to correct the discrepancies in the field edges between the DP of an inversely reconstructed spectrum and the measured DP. Knowledge of the energy spectrum of an electron beam is relevant for accurate dose calculation in radiotherapy. In previous works, it has been possible to reconstruct the electron spectrum of various clinical energies (6, 9, 12 and 15 MeV) within the typical percentage of clinical acceptance (Pa > 95 %) according to the gamma index (GI) (2 %/2mm), for both depth dose percentages (PDD) and dose profiles (DP), except for 6 MeV profiles. Therefore, the purpose of this work was to introduce air between the radiation source and the phantom surface to simulate both the monoenergetic PDDs necessary in the reconstruction of the spectrum of a 6 MeV beam and to obtain the PDD of this spectrum. Validation was performed using the gamma index with the typical threshold for clinical acceptance. The results showed that the PDP of the vacuum spectrum had a better agreement than the PDP of the air spectrum (Pa = 100 %), with respect to the measured PDD (Pa = 97 %). Regarding the PD, the introduction of air improved the agreement in clinical interest but not enough to reach the acceptance percentage. It is concluded that this technique does not seem to be a good alternative to correct the discrepancies in the field edges between the DP of an inversely reconstructed spectrum and the measured DP. Universidad Pedagógica y Tecnológica de Colombia - UPTC 2023-06-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.uptc.edu.co/index.php/ingenieria_sogamoso/article/view/14751 10.19053/1900771X.v23.n1.2023.14751 Ingeniería Investigación y Desarrollo; Vol. 23 No. 1 (2023): January - June; 14 - 18 Ingeniería Investigación y Desarrollo; Vol. 23 Núm. 1 (2023): Enero - Junio; 14 - 18 2422-4324 1900-771X eng https://revistas.uptc.edu.co/index.php/ingenieria_sogamoso/article/view/14751/13022 Derechos de autor 2023 Ingeniería Investigación y Desarrollo |
| spellingShingle | inverse reconstruction electrons air gamma index dose profile Wilches Visbal, Jorge Homero ON THE CORRECTION OF DOSE PROFILE DISCREPANCIES BY INTRODUCING AIR IN THE DERIVATION OF AN ELECTRON SPECTRUM |
| title | ON THE CORRECTION OF DOSE PROFILE DISCREPANCIES BY INTRODUCING AIR IN THE DERIVATION OF AN ELECTRON SPECTRUM |
| title_alt | ON THE CORRECTION OF DOSE PROFILE DISCREPANCIES BY INTRODUCING AIR IN THE DERIVATION OF AN ELECTRON SPECTRUM |
| title_full | ON THE CORRECTION OF DOSE PROFILE DISCREPANCIES BY INTRODUCING AIR IN THE DERIVATION OF AN ELECTRON SPECTRUM |
| title_fullStr | ON THE CORRECTION OF DOSE PROFILE DISCREPANCIES BY INTRODUCING AIR IN THE DERIVATION OF AN ELECTRON SPECTRUM |
| title_full_unstemmed | ON THE CORRECTION OF DOSE PROFILE DISCREPANCIES BY INTRODUCING AIR IN THE DERIVATION OF AN ELECTRON SPECTRUM |
| title_short | ON THE CORRECTION OF DOSE PROFILE DISCREPANCIES BY INTRODUCING AIR IN THE DERIVATION OF AN ELECTRON SPECTRUM |
| title_sort | on the correction of dose profile discrepancies by introducing air in the derivation of an electron spectrum |
| topic | inverse reconstruction electrons air gamma index dose profile |
| topic_facet | inverse reconstruction electrons air gamma index dose profile |
| url | https://revistas.uptc.edu.co/index.php/ingenieria_sogamoso/article/view/14751 |
| work_keys_str_mv | AT wilchesvisbaljorgehomero onthecorrectionofdoseprofilediscrepanciesbyintroducingairinthederivationofanelectronspectrum |
