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Radiation dose and image quality in pediatric chest CT: effects of iterative reconstruction in normal weight and overweight children

 Haesung Yoon  ;  Myung-Joon Kim  ;  Choon-Sik Yoon  ;  Jiin Choi  ;  Hyun Joo Shin  ;  Hyun Gi Kim  ;  Mi-Jung Lee 
 PEDIATRIC RADIOLOGY, Vol.45(3) : 337-344, 2015 
Journal Title
Issue Date
Adolescent ; Child ; Child, Preschool ; Female ; Humans ; Infant ; Male ; Multidetector Computed Tomography/methods* ; Overweight/diagnostic imaging* ; Radiation Dosage* ; Radiographic Image Interpretation, Computer-Assisted/methods* ; Radiography, Thoracic/methods* ; Retrospective Studies
Ionizing radiation ; Chest ; Multidetector computed tomography ; Child ; Overweight
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 AND METHODS: We retrospectively reviewed 40 pediatric chest CT (M:F = 21:19; 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.
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1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Yonsei Biomedical Research Center (연세의생명연구원) > 1. Journal Papers
Yonsei Authors
Kim, Myung Joon(김명준) ORCID logo https://orcid.org/0000-0002-4608-0275
Kim, Hyun Gi(김현지)
Shin, Hyun Joo(신현주) ORCID logo https://orcid.org/0000-0002-7462-2609
Yoon, Choon Sik(윤춘식) ORCID logo https://orcid.org/0000-0003-2010-6710
Lee, Mi-Jung(이미정) ORCID logo https://orcid.org/0000-0003-3244-9171
Choi, Ji In(최지인)
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