Dose reduction evaluation in radiosensitive tissues for head CT scans using two phantoms and bismuth eye shielding
Computed tomography is the imaging technique that most contributes to increasing the population average dose. Head scanning protocols have a very high dose in patients due to the small thicknesses of the slice for 3D image reconstruction. In this sense, radiosensitive tissues, such as the eye lense...
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| Format: | Article |
| Language: | English |
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Brazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR)
2022-09-01
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| Series: | Brazilian Journal of Radiation Sciences |
| Subjects: | |
| Online Access: | https://bjrs.org.br/revista/index.php/REVISTA/article/view/2040 |
| _version_ | 1797985920053411840 |
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| author | Lorena Cunha Fernandes Arnaldo Prata Mourão |
| author_facet | Lorena Cunha Fernandes Arnaldo Prata Mourão |
| author_sort | Lorena Cunha Fernandes |
| collection | DOAJ |
| description |
Computed tomography is the imaging technique that most contributes to increasing the population average dose. Head scanning protocols have a very high dose in patients due to the small thicknesses of the slice for 3D image reconstruction. In this sense, radiosensitive tissues, such as the eye lenses and the thyroid, receive significant doses, as they are close to or in the irradiated field. The objective of this work is to present data on the variation of absorbed dose in the eye lenses and thyroid, with and without the use of bismuth eye shielding in head CT scans, and also to analyze the best dose-to-noise ratio in order to observe whether there is a decrease in image quality capable of rendering the proposed protocols useless. The method is based on head scans testing optimized protocols for the radiology service. Two male phantoms, one anthropomorphic and the other made in polymethyl methacrylate (PMMA), were used in the tests and radiochromic films were used to measure the absorbed dose values. The films were placed in the eye lenses and thyroid regions. Scans were performed on a GE CT scanner with 64-channel, Light Speed model. The obtained data allowed to observe the dose variation in the tissues and to conclude which of used protocols presented has the best noise-to-dose ratio for the use of the bismuth eye shielding. The results obtained will be important to suggest a complementary procedure for the optimization of head CT scans.
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| first_indexed | 2024-04-11T07:25:32Z |
| format | Article |
| id | doaj.art-89228301a5534816bc4db5cb99ead5e0 |
| institution | Directory Open Access Journal |
| issn | 2319-0612 |
| language | English |
| last_indexed | 2024-04-11T07:25:32Z |
| publishDate | 2022-09-01 |
| publisher | Brazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR) |
| record_format | Article |
| series | Brazilian Journal of Radiation Sciences |
| spelling | doaj.art-89228301a5534816bc4db5cb99ead5e02022-12-22T04:37:05ZengBrazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR)Brazilian Journal of Radiation Sciences2319-06122022-09-0110310.15392/bjrs.v10i3.2040Dose reduction evaluation in radiosensitive tissues for head CT scans using two phantoms and bismuth eye shieldingLorena Cunha FernandesArnaldo Prata Mourão0Universidade Federal de Minas Gerais / Departamento de Engenharia Nuclear Computed tomography is the imaging technique that most contributes to increasing the population average dose. Head scanning protocols have a very high dose in patients due to the small thicknesses of the slice for 3D image reconstruction. In this sense, radiosensitive tissues, such as the eye lenses and the thyroid, receive significant doses, as they are close to or in the irradiated field. The objective of this work is to present data on the variation of absorbed dose in the eye lenses and thyroid, with and without the use of bismuth eye shielding in head CT scans, and also to analyze the best dose-to-noise ratio in order to observe whether there is a decrease in image quality capable of rendering the proposed protocols useless. The method is based on head scans testing optimized protocols for the radiology service. Two male phantoms, one anthropomorphic and the other made in polymethyl methacrylate (PMMA), were used in the tests and radiochromic films were used to measure the absorbed dose values. The films were placed in the eye lenses and thyroid regions. Scans were performed on a GE CT scanner with 64-channel, Light Speed model. The obtained data allowed to observe the dose variation in the tissues and to conclude which of used protocols presented has the best noise-to-dose ratio for the use of the bismuth eye shielding. The results obtained will be important to suggest a complementary procedure for the optimization of head CT scans. https://bjrs.org.br/revista/index.php/REVISTA/article/view/2040Computed tomographybismuth eye shieldingdosimetryradiochromic film |
| spellingShingle | Lorena Cunha Fernandes Arnaldo Prata Mourão Dose reduction evaluation in radiosensitive tissues for head CT scans using two phantoms and bismuth eye shielding Brazilian Journal of Radiation Sciences Computed tomography bismuth eye shielding dosimetry radiochromic film |
| title | Dose reduction evaluation in radiosensitive tissues for head CT scans using two phantoms and bismuth eye shielding |
| title_full | Dose reduction evaluation in radiosensitive tissues for head CT scans using two phantoms and bismuth eye shielding |
| title_fullStr | Dose reduction evaluation in radiosensitive tissues for head CT scans using two phantoms and bismuth eye shielding |
| title_full_unstemmed | Dose reduction evaluation in radiosensitive tissues for head CT scans using two phantoms and bismuth eye shielding |
| title_short | Dose reduction evaluation in radiosensitive tissues for head CT scans using two phantoms and bismuth eye shielding |
| title_sort | dose reduction evaluation in radiosensitive tissues for head ct scans using two phantoms and bismuth eye shielding |
| topic | Computed tomography bismuth eye shielding dosimetry radiochromic film |
| url | https://bjrs.org.br/revista/index.php/REVISTA/article/view/2040 |
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