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Half-dose abdominal CT with sinogram-affirmed iterative reconstruction technique in children - comparison with full-dose CT with filtered back projection

 Minwook Lee  ;  Myung-Joon Kim  ;  Kyung Hwa Han  ;  Mi-Jung Lee 
 PEDIATRIC RADIOLOGY, Vol.45(2) : 188-193, 2015 
Journal Title
Issue Date
Adolescent ; Artifacts ; Child ; Child, Preschool ; Female ; Humans ; Infant ; Male ; Phantoms, Imaging ; Radiation Dosage* ; Radiographic Image Interpretation, Computer-Assisted/methods* ; Radiography, Abdominal ; Retrospective Studies ; Tomography, X-Ray Computed/methods*
Computed tomography ; Radiation dose ; Image quality ; Iterative reconstruction ; Children
BACKGROUND: Iterative reconstruction can be helpful to reduce radiation dose while maintaining image quality. However, this technique has not been fully evaluated in children during abdominal CT. OBJECTIVE: To compare objective and subjective image quality between half-dose images reconstructed with iterative reconstruction at iteration strength levels 1 to 5 (half-S1 to half-S5 studies) and full-dose images reconstructed with filtered back projection (full studies) in pediatric abdominal CT. MATERIALS AND METHODS: Twenty-one children (M:F = 13:8; mean age 8.2 ± 5.7 years) underwent dual-source abdominal CT (mean effective dose 4.8 ± 2.1 mSv). The objective image quality was evaluated as noise. Subjective image quality analysis was performed comparing each half study to the full study for noise, sharpness, artifact and diagnostic acceptability. RESULTS: Both objective and subjective image noise decreased with increasing iteration strength. Half-S4 and -S5 studies showed objective image noise similar to or lower than that of full studies. The half-S2 and -S3 studies produced the greatest sharpness and the half-S5 studies were the worst from a blocky appearance. Full and half studies did not differ in artifacts. Half-S3 studies showed the best diagnostic acceptability. CONCLUSION: Half-S4 and -S5 studies objectively and half-S3 studies subjectively showed comparable image quality to full studies in pediatric abdominal CT.
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1. College of Medicine (의과대학) > Yonsei Biomedical Research Center (연세의생명연구원) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Myung Joon(김명준) ORCID logo https://orcid.org/0000-0002-4608-0275
Lee, Mi-Jung(이미정) ORCID logo https://orcid.org/0000-0003-3244-9171
Han, Kyung Hwa(한경화)
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