Dual-source computed tomography of the lung with spectral shaping and advanced iterative reconstruction: potential for maximum radiation dose reduction.
Pediatr Radiol
; 50(9): 1240-1248, 2020 08.
Article
em En
| MEDLINE
| ID: mdl-32556576
ABSTRACT
BACKGROUND:
Radiation dose at CT should be as low as possible without compromising diagnostic quality.OBJECTIVE:
To assess the potential for maximum dose reduction of pediatric lung dual-source CT with spectral shaping and advanced iterative reconstruction (ADMIRE). MATERIALS ANDMETHODS:
We retrospectively analyzed dual-source CT acquisitions in a full-dose group (FD 100 kV, 64 reference mAs) and in three groups with spectral shaping and differing reference mAs values (Sn 100 kV, 96/64/32 reference mAs), each group consisting of 16 patients (age mean 11.5 years, standard deviation 4.8 years, median 12.8 years, range 1.3-18 years). Advanced iterative reconstruction of images was performed with different strengths (FD ADMIRE Level 2; Sn ADMIRE Levels 2, 3 and 4). We analyzed dose parameters and measured noise. Diagnostic confidence and detectability of lung lesions as well as anatomical structures were assessed using a Likert scale (from 1 [unacceptable] to 4 [fully acceptable]).RESULTS:
Compared to full dose, effective dose was reduced to 16.7% in the Sn 96 group, 11.1% in Sn64, and 5.5% in Sn32 (P<0.001). Noise values of Sn64ADM4 did not statistically differ from those in FDADM2 (45.7 vs. 38.9 Hounsfield units [HU]; P=0.132), whereas noise was significantly higher in Sn32ADM4 compared to Sn64ADM4 (61.5 HU; P<0.001). A Likert score >3 was reached in Sn64ADM4 regarding diagnostic confidence (3.2) and detectability of lung lesions (3.3). For detectability of most anatomical structures, no significant differences were found between FDAM2 and Sn64ADM4 (P≥0.05).CONCLUSION:
In pediatric lung dual-source CT, spectral shaping together with ADMIRE 4 enable radiation dose reduction to about 10% of a full-dose protocol while maintaining an acceptable diagnostic quality.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Doses de Radiação
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Interpretação de Imagem Radiográfica Assistida por Computador
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Tomografia Computadorizada por Raios X
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Pneumopatias
Tipo de estudo:
Guideline
/
Observational_studies
Limite:
Adolescent
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Child
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Child, preschool
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Female
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Humans
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Infant
/
Male
Idioma:
En
Revista:
Pediatr Radiol
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Alemanha