Aortic Valve and Thoracic Aortic Calcification Measurements: How Low Can We Go in Radiation Dose?
J Comput Assist Tomogr
; 41(1): 148-155, 2017 Jan.
Article
em En
| MEDLINE
| ID: mdl-27560017
ABSTRACT
OBJECTIVE:
This study aimed to determine the lowest radiation dose and iterative reconstruction level(s) at which computed tomography (CT)-based quantification of aortic valve calcification (AVC) and thoracic aortic calcification (TAC) is still feasible.METHODS:
Twenty-eight patients underwent a cardiac CT and 20 patients a chest CT at 4 different dose levels (routine dose and approximately 40%, 60%, and 80% reduced dose). Data were reconstructed with filtered back projection, 3 iDose levels, and 3 iterative model-based reconstruction levels. Two observers scored subjective image quality. The AVC and TAC were quantified using mass and compared to the reference scan (routine dose reconstructed with filtered back projection).RESULTS:
In cardiac CT at 0.35 mSv (60% reduced), all scans reconstructed with iDose (all levels) were diagnostic, calcification detection errors occurred in only 1 patient, and there were no significant differences in mass scores compared to the reference scan. Similar results were found for chest CT at 0.48 mSv (75% reduced) with iDose levels 4 and 6 and iterative model reconstruction levels 1 and 2.CONCLUSIONS:
Iterative reconstruction enables AVC and TAC quantification on CT at submillisievert dose.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Aorta Torácica
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Valva Aórtica
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Proteção Radiológica
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Tomografia Computadorizada por Raios X
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Exposição à Radiação
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Calcificação Vascular
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Aged
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
J Comput Assist Tomogr
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Holanda