11-year workload and barrier analysis for a high-energy linear accelerator
The formalism used for barriers calculations is based on a conservative estimation of workload, use factor, and occupancy factor. IMRT techniques (Intensity Modulated Radiation Therapy) and VMAT (Volumetric Modulated Arc Therapy) are known for being superior to conventional techniques, but costly f...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Brazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR)
2021-06-01
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| Series: | Brazilian Journal of Radiation Sciences |
| Subjects: | |
| Online Access: | https://bjrs.org.br/revista/index.php/REVISTA/article/view/1687 |
| _version_ | 1798027512481054720 |
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| author | Isabela Rodrigues Rigo Ana Paula Vollet Cunha Caroline Zeppellini dos Santos Emiliozzi Gisela Menegussi |
| author_facet | Isabela Rodrigues Rigo Ana Paula Vollet Cunha Caroline Zeppellini dos Santos Emiliozzi Gisela Menegussi |
| author_sort | Isabela Rodrigues Rigo |
| collection | DOAJ |
| description |
The formalism used for barriers calculations is based on a conservative estimation of workload, use factor, and occupancy factor. IMRT techniques (Intensity Modulated Radiation Therapy) and VMAT (Volumetric Modulated Arc Therapy) are known for being superior to conventional techniques, but costly from the shielding standpoint, as they increase the number of monitor units used to deliver the same dose to the patient, increasing the leakage radiation produced and, consequently, the thickness of the secondary barriers. At InRad (Radiology Institute of HC-FMUSP) a 2100CD LINAC already installed was upgraded to perform IMRT/VMAT techniques, and the existing barrier was reassessed. The present study proposes a methodology for acquiring real workload data from the institution's management software (MOSAIQ®) to replace the initially estimated data and recalculate the thickness of the barriers, assessing the impact of the introduction of these techniques and understanding the profile of the treatments carried out at the institution over the years of 2010 to 2020. Through this methodology, a decrease in the workload of 15 MV was observed as the technique of modulated intensity with 6 MV was introduced, reducing the thicknesses calculated for primary barriers. However, no significant changes were observed in the thicknesses calculated for the secondary barriers, because despite the increase in the leakage workload of 6 MV, the total workload of 15 MV decreased. There was also a trend towards an increase in the number of patients treated with modulated intensity year after year, which went from 5% in 2016 to 67% in 2020.
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| first_indexed | 2024-04-11T18:52:52Z |
| format | Article |
| id | doaj.art-34d15202643446a299bacdda27ccdb04 |
| institution | Directory Open Access Journal |
| issn | 2319-0612 |
| language | English |
| last_indexed | 2024-04-11T18:52:52Z |
| publishDate | 2021-06-01 |
| publisher | Brazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR) |
| record_format | Article |
| series | Brazilian Journal of Radiation Sciences |
| spelling | doaj.art-34d15202643446a299bacdda27ccdb042022-12-22T04:08:17ZengBrazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR)Brazilian Journal of Radiation Sciences2319-06122021-06-019210.15392/bjrs.v9i2.168711-year workload and barrier analysis for a high-energy linear acceleratorIsabela Rodrigues Rigo0Ana Paula Vollet Cunha1Caroline Zeppellini dos Santos Emiliozzi2Gisela Menegussi3Faculdade de Medicina FMUSP, Universidade de São PauloHospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São PauloHospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São PauloHospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo The formalism used for barriers calculations is based on a conservative estimation of workload, use factor, and occupancy factor. IMRT techniques (Intensity Modulated Radiation Therapy) and VMAT (Volumetric Modulated Arc Therapy) are known for being superior to conventional techniques, but costly from the shielding standpoint, as they increase the number of monitor units used to deliver the same dose to the patient, increasing the leakage radiation produced and, consequently, the thickness of the secondary barriers. At InRad (Radiology Institute of HC-FMUSP) a 2100CD LINAC already installed was upgraded to perform IMRT/VMAT techniques, and the existing barrier was reassessed. The present study proposes a methodology for acquiring real workload data from the institution's management software (MOSAIQ®) to replace the initially estimated data and recalculate the thickness of the barriers, assessing the impact of the introduction of these techniques and understanding the profile of the treatments carried out at the institution over the years of 2010 to 2020. Through this methodology, a decrease in the workload of 15 MV was observed as the technique of modulated intensity with 6 MV was introduced, reducing the thicknesses calculated for primary barriers. However, no significant changes were observed in the thicknesses calculated for the secondary barriers, because despite the increase in the leakage workload of 6 MV, the total workload of 15 MV decreased. There was also a trend towards an increase in the number of patients treated with modulated intensity year after year, which went from 5% in 2016 to 67% in 2020. https://bjrs.org.br/revista/index.php/REVISTA/article/view/1687shieldingworkloadIMRTVMAT |
| spellingShingle | Isabela Rodrigues Rigo Ana Paula Vollet Cunha Caroline Zeppellini dos Santos Emiliozzi Gisela Menegussi 11-year workload and barrier analysis for a high-energy linear accelerator Brazilian Journal of Radiation Sciences shielding workload IMRT VMAT |
| title | 11-year workload and barrier analysis for a high-energy linear accelerator |
| title_full | 11-year workload and barrier analysis for a high-energy linear accelerator |
| title_fullStr | 11-year workload and barrier analysis for a high-energy linear accelerator |
| title_full_unstemmed | 11-year workload and barrier analysis for a high-energy linear accelerator |
| title_short | 11-year workload and barrier analysis for a high-energy linear accelerator |
| title_sort | 11 year workload and barrier analysis for a high energy linear accelerator |
| topic | shielding workload IMRT VMAT |
| url | https://bjrs.org.br/revista/index.php/REVISTA/article/view/1687 |
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