Radiation dose and image quality in pediatric chest CT: effects of iterative reconstruction in normal weight and overweight children.
Pediatr Radiol
; 45(3): 337-44, 2015 Mar.
Article
em En
| MEDLINE
| ID: mdl-25256153
ABSTRACT
BACKGROUND:
New CT reconstruction techniques may help reduce the burden of ionizing radiation.OBJECTIVE:
To quantify radiation dose reduction when performing pediatric chest CT using a low-dose protocol and 50% adaptive statistical iterative reconstruction (ASIR) compared with age/gender-matched chest CT using a conventional dose protocol and reconstructed with filtered back projection (control group) and to determine its effect on image quality in normal weight and overweight children. MATERIALS ANDMETHODS:
We retrospectively reviewed 40 pediatric chest CT (MF = 2119; range 0.1-17 years) in both groups. Radiation dose was compared between the two groups using paired Student's t-test. Image quality including noise, sharpness, artifacts and diagnostic acceptability was subjectively assessed by three pediatric radiologists using a four-point scale (superior, average, suboptimal, unacceptable).RESULTS:
Eight children in the ASIR group and seven in the control group were overweight. All radiation dose parameters were significantly lower in the ASIR group (P < 0.01) with a greater than 57% dose reduction in overweight children. Image noise was higher in the ASIR group in both normal weight and overweight children. Only one scan in the ASIR group (1/40, 2.5%) was rated as diagnostically suboptimal and there was no unacceptable study.CONCLUSION:
In both normal weight and overweight children, the ASIR technique is associated with a greater than 57% mean dose reduction, without significantly impacting diagnostic image quality in pediatric chest CT examinations. However, CT scans in overweight children may have a greater noise level, even when using the ASIR technique.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Doses de Radiação
/
Radiografia Torácica
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Interpretação de Imagem Radiográfica Assistida por Computador
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Sobrepeso
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Tomografia Computadorizada Multidetectores
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:
2015
Tipo de documento:
Article