Effect of bismuth breast shielding on radiation dose and image quality in coronary CT angiography.
J Nucl Cardiol
; 19(1): 100-8, 2012 Feb.
Article
em En
| MEDLINE
| ID: mdl-22068687
ABSTRACT
BACKGROUND:
Coronary computed tomographic angiography (CCTA) is associated with high radiation dose to the female breasts. Bismuth breast shielding offers the potential to significantly reduce dose to the breasts and nearby organs, but the magnitude of this reduction and its impact on image quality and radiation dose have not been evaluated.METHODS:
Radiation doses from CCTA to critical organs were determined using metal-oxide-semiconductor field-effect transistors positioned in a customized anthropomorphic whole-body dosimetry verification phantom. Image noise and signal were measured in regions of interest (ROIs) including the coronary arteries.RESULTS:
With bismuth shielding, breast radiation dose was reduced 46%-57% depending on breast size and scanning technique, with more moderate dose reduction to the heart, lungs, and esophagus. However, shielding significantly decreased image signal (by 14.6 HU) and contrast (by 28.4 HU), modestly but significantly increased image noise in ROIs in locations of coronary arteries, and decreased contrast-to-noise ratio by 20.9%.CONCLUSIONS:
While bismuth breast shielding can significantly decrease radiation dose to critical organs, it is associated with an increase in image noise, decrease in contrast-to-noise, and changes tissue attenuation characteristics in the location of the coronary arteries.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Doses de Radiação
/
Lesões por Radiação
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Proteção Radiológica
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Bismuto
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Mama
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Tomografia Computadorizada por Raios X
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Angiografia Coronária
Tipo de estudo:
Diagnostic_studies
/
Etiology_studies
Limite:
Female
/
Humans
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article