Dosimetric evaluation of breast radiotherapy treatments using magnetic valve expansion prostheses
This work intends to verify the influence on the dose distribution that the expansive prosthesis (SILIMED/470), containing a magnetic valve, generates in postoperative radiotherapy treatments of patients who underwent mastectomy. The presence of this metal during radiotherapy difficulties the treatm...
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Brazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR)
2022-07-01
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| Series: | Brazilian Journal of Radiation Sciences |
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| Online Access: | https://bjrs.org.br/revista/index.php/REVISTA/article/view/2014 |
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| author | Jéssica Caroline Lizar Juliana Fernandes Pavoni Yanai Krutman Oswaldo Baffa |
| author_facet | Jéssica Caroline Lizar Juliana Fernandes Pavoni Yanai Krutman Oswaldo Baffa |
| author_sort | Jéssica Caroline Lizar |
| collection | DOAJ |
| description | This work intends to verify the influence on the dose distribution that the expansive prosthesis (SILIMED/470), containing a magnetic valve, generates in postoperative radiotherapy treatments of patients who underwent mastectomy. The presence of this metal during radiotherapy difficulties the treatment planning stage, due to the artifacts generated by the magnet in the acquisition of computed tomography. Radiochromic films (Gafchromic EBT2) were used for planar detection inside the prosthesis, around the metal in a plastic phantom that simulates breast geometry filled with water, an insert in the center allowed the placement of the magnet and 2.5 mm thick acrylic layers for film positioning above and below the metal at different depths. The phantom was irradiated with a 3D planning performed in XiO software (CMS RTP) with no heterogeneity correction, using beams of 6 MV and 15MV from the Oncor linear accelerator (Siemens) with a dose of 2Gy. The film calibration methodology was performed, and the optical densities of the films were measured using a CQ-01 digital densitometer (MRA). In the internal region of the prosthesis, for irradiation with 6MV, an unexpected dose increases of 7.6% was obtained for all films and, just above the magnet, an increase of 14.4% was noted. For the 15 MV beam, the films around the magnet had a dose increase of 10.4% considering the planning value and at 10mm away from the metal, a decrease of 1.28% of the expected dose was observed. |
| format | Article |
| id | doaj-art-823f44facb2e4841a2a48c0e5d1b2906 |
| institution | Matheson Library |
| issn | 2319-0612 |
| language | English |
| publishDate | 2022-07-01 |
| publisher | Brazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR) |
| record_format | Article |
| series | Brazilian Journal of Radiation Sciences |
| spelling | doaj-art-823f44facb2e4841a2a48c0e5d1b29062025-07-16T00:48:59ZengBrazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR)Brazilian Journal of Radiation Sciences2319-06122022-07-01102A (Suppl.)10.15392/bjrs.v10i2A.20141632Dosimetric evaluation of breast radiotherapy treatments using magnetic valve expansion prosthesesJéssica Caroline Lizar0Juliana Fernandes Pavoni1Yanai Krutman2Oswaldo Baffa3Universidade de São Paulo - USPDepartmento de Física, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São PauloRadiotherapy Department, Institute of Oncology, Soroka University Medical CenterDepartmento de Física, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São PauloThis work intends to verify the influence on the dose distribution that the expansive prosthesis (SILIMED/470), containing a magnetic valve, generates in postoperative radiotherapy treatments of patients who underwent mastectomy. The presence of this metal during radiotherapy difficulties the treatment planning stage, due to the artifacts generated by the magnet in the acquisition of computed tomography. Radiochromic films (Gafchromic EBT2) were used for planar detection inside the prosthesis, around the metal in a plastic phantom that simulates breast geometry filled with water, an insert in the center allowed the placement of the magnet and 2.5 mm thick acrylic layers for film positioning above and below the metal at different depths. The phantom was irradiated with a 3D planning performed in XiO software (CMS RTP) with no heterogeneity correction, using beams of 6 MV and 15MV from the Oncor linear accelerator (Siemens) with a dose of 2Gy. The film calibration methodology was performed, and the optical densities of the films were measured using a CQ-01 digital densitometer (MRA). In the internal region of the prosthesis, for irradiation with 6MV, an unexpected dose increases of 7.6% was obtained for all films and, just above the magnet, an increase of 14.4% was noted. For the 15 MV beam, the films around the magnet had a dose increase of 10.4% considering the planning value and at 10mm away from the metal, a decrease of 1.28% of the expected dose was observed.https://bjrs.org.br/revista/index.php/REVISTA/article/view/2014radiation oncologyfilm dosimetrymastectomy |
| spellingShingle | Jéssica Caroline Lizar Juliana Fernandes Pavoni Yanai Krutman Oswaldo Baffa Dosimetric evaluation of breast radiotherapy treatments using magnetic valve expansion prostheses Brazilian Journal of Radiation Sciences radiation oncology film dosimetry mastectomy |
| title | Dosimetric evaluation of breast radiotherapy treatments using magnetic valve expansion prostheses |
| title_full | Dosimetric evaluation of breast radiotherapy treatments using magnetic valve expansion prostheses |
| title_fullStr | Dosimetric evaluation of breast radiotherapy treatments using magnetic valve expansion prostheses |
| title_full_unstemmed | Dosimetric evaluation of breast radiotherapy treatments using magnetic valve expansion prostheses |
| title_short | Dosimetric evaluation of breast radiotherapy treatments using magnetic valve expansion prostheses |
| title_sort | dosimetric evaluation of breast radiotherapy treatments using magnetic valve expansion prostheses |
| topic | radiation oncology film dosimetry mastectomy |
| url | https://bjrs.org.br/revista/index.php/REVISTA/article/view/2014 |
| work_keys_str_mv | AT jessicacarolinelizar dosimetricevaluationofbreastradiotherapytreatmentsusingmagneticvalveexpansionprostheses AT julianafernandespavoni dosimetricevaluationofbreastradiotherapytreatmentsusingmagneticvalveexpansionprostheses AT yanaikrutman dosimetricevaluationofbreastradiotherapytreatmentsusingmagneticvalveexpansionprostheses AT oswaldobaffa dosimetricevaluationofbreastradiotherapytreatmentsusingmagneticvalveexpansionprostheses |