Bismuth-silicon and bismuth-polyurethane composite shields for breast protection in chest computed tomography examinations
The article aims at constructing protective composite shields for breasts in chest computed tomography and investigating the effects of applying these new bismuth composites on dose and image quality. Polyurethane and silicon with 5% of bismuth were fabricated as a protective shield. At first, their...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2018-01-01
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| Series: | Journal of Medical Physics |
| Subjects: | |
| Online Access: | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2018;volume=43;issue=1;spage=61;epage=65;aulast=Mehnati |
| _version_ | 1819275070018682880 |
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| author | Parinaz Mehnati Mehran Arash Parisa Akhlaghi |
| author_facet | Parinaz Mehnati Mehran Arash Parisa Akhlaghi |
| author_sort | Parinaz Mehnati |
| collection | DOAJ |
| description | The article aims at constructing protective composite shields for breasts in chest computed tomography and investigating the effects of applying these new bismuth composites on dose and image quality. Polyurethane and silicon with 5% of bismuth were fabricated as a protective shield. At first, their efficiency in attenuating the X-ray beam was investigated by calculating the total attenuation coefficients at diagnostic energy range. Then, a physical chest phantom was scanned without and with these shields at tube voltage of 120 kVp, and image parameters together with dose values were studied. The results showed that these two shields have great effects on attenuating the X-ray beam, especially for lower energies (<40 kV), and in average, the attenuation coefficients of bismuth-polyurethane composite are higher in this energy range. The maximum relative differences between the average Hounsfield units (HUs) and noises of images without and with shield for both composites in 13 regions of interest were 4.5% and 15.7%, respectively. Moreover, primary investigation confirmed the ability of both shields (especially polyurethane-bismuth composite) in dose reduction. Comparing these two composites regarding the amount of dose reduction, the changes in HU and noise, and attenuation coefficients in diagnostic energy range, it seems that polyurethane composite is more useful for dose reduction, especially for higher tube voltages. |
| first_indexed | 2024-12-23T23:18:28Z |
| format | Article |
| id | doaj.art-9772c19fbfe14f989b099bf6d5acba5b |
| institution | Directory Open Access Journal |
| issn | 0971-6203 1998-3913 |
| language | English |
| last_indexed | 2024-12-23T23:18:28Z |
| publishDate | 2018-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Journal of Medical Physics |
| spelling | doaj.art-9772c19fbfe14f989b099bf6d5acba5b2022-12-21T17:26:25ZengWolters Kluwer Medknow PublicationsJournal of Medical Physics0971-62031998-39132018-01-01431616510.4103/jmp.JMP_74_17Bismuth-silicon and bismuth-polyurethane composite shields for breast protection in chest computed tomography examinationsParinaz MehnatiMehran ArashParisa AkhlaghiThe article aims at constructing protective composite shields for breasts in chest computed tomography and investigating the effects of applying these new bismuth composites on dose and image quality. Polyurethane and silicon with 5% of bismuth were fabricated as a protective shield. At first, their efficiency in attenuating the X-ray beam was investigated by calculating the total attenuation coefficients at diagnostic energy range. Then, a physical chest phantom was scanned without and with these shields at tube voltage of 120 kVp, and image parameters together with dose values were studied. The results showed that these two shields have great effects on attenuating the X-ray beam, especially for lower energies (<40 kV), and in average, the attenuation coefficients of bismuth-polyurethane composite are higher in this energy range. The maximum relative differences between the average Hounsfield units (HUs) and noises of images without and with shield for both composites in 13 regions of interest were 4.5% and 15.7%, respectively. Moreover, primary investigation confirmed the ability of both shields (especially polyurethane-bismuth composite) in dose reduction. Comparing these two composites regarding the amount of dose reduction, the changes in HU and noise, and attenuation coefficients in diagnostic energy range, it seems that polyurethane composite is more useful for dose reduction, especially for higher tube voltages.http://www.jmp.org.in/article.asp?issn=0971-6203;year=2018;volume=43;issue=1;spage=61;epage=65;aulast=MehnatiBismuth compositesbreast shieldingcomputed tomographydose reductionHounsfield unitnoise |
| spellingShingle | Parinaz Mehnati Mehran Arash Parisa Akhlaghi Bismuth-silicon and bismuth-polyurethane composite shields for breast protection in chest computed tomography examinations Journal of Medical Physics Bismuth composites breast shielding computed tomography dose reduction Hounsfield unit noise |
| title | Bismuth-silicon and bismuth-polyurethane composite shields for breast protection in chest computed tomography examinations |
| title_full | Bismuth-silicon and bismuth-polyurethane composite shields for breast protection in chest computed tomography examinations |
| title_fullStr | Bismuth-silicon and bismuth-polyurethane composite shields for breast protection in chest computed tomography examinations |
| title_full_unstemmed | Bismuth-silicon and bismuth-polyurethane composite shields for breast protection in chest computed tomography examinations |
| title_short | Bismuth-silicon and bismuth-polyurethane composite shields for breast protection in chest computed tomography examinations |
| title_sort | bismuth silicon and bismuth polyurethane composite shields for breast protection in chest computed tomography examinations |
| topic | Bismuth composites breast shielding computed tomography dose reduction Hounsfield unit noise |
| url | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2018;volume=43;issue=1;spage=61;epage=65;aulast=Mehnati |
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