Radiation dose in cardiac CT angiography: protocols and image quality.
Radiat Prot Dosimetry
; 155(1): 73-80, 2013 Jun.
Article
em En
| MEDLINE
| ID: mdl-23235799
ABSTRACT
This paper aims to evaluate the radiation dose exposure of patients submitted to cardiac computed tomography angiography. The effective dose was obtained from the product of dose-length product values and the conversion factor established in the European Working Group for Guidelines on Quality Criteria in CT. The image noise and contrast- and signal-to-noise ratios were obtained for all images. Sixty-four- and 256-slice CT angiographies were used in 211 (68.5 %) and 97 (31.5 %) patients, respectively. The calculated mean effective dose with prospective CT angiography was 6.0±1.0 mSv and the retrospective mode was 8.4±1.2 mSv. The mean image noise values were 38.5±9.5 and 21.4 ± 5.3 for prospective and retrospective modes, respectively. It was observed that the image noise increased by 44.4 % using a prospective mode. Prospective CT angiography reduces radiation dose by â¼29 % compared with the retrospective mode, while maintaining diagnostic image quality and the ability to assess obstructions in patients.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Doença da Artéria Coronariana
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Interpretação de Imagem Radiográfica Assistida por Computador
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Intensificação de Imagem Radiográfica
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Tomografia Computadorizada por Raios X
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Angiografia Coronária
Tipo de estudo:
Guideline
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Observational_studies
Limite:
Adult
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Aged
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Aged80
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
Radiat Prot Dosimetry
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Brasil