Effects of adaptive statistical iterative reconstruction on radiation dose reduction and diagnostic accuracy of pediatric abdominal CT

Sohi Bae, Myung Joon Kim, Choon Sik Yoon, Dong Wook Kim, Jung Hwa Hong, MiJung Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Background: Since children are more radio-sensitive than adults, there is a need to minimize radiation exposure during CT exams.

Objective: To evaluate the effects of adaptive statistical iterative reconstruction (ASIR) on radiation dose reduction, image quality and diagnostic accuracy in pediatric abdominal CT.

Materials and methods: We retrospectively reviewed the abdominal CT examinations of 41 children (24 boys and 17 girls; mean age: 10 years) with a low-dose radiation protocol and reconstructed with ASIR (the ASIR group). We also reviewed routine-dose abdominal CT examinations of 41 age- and sex-matched controls reconstructed with filtered-back projection (control group). Image quality was assessed objectively as noise measured in the liver, spleen and aorta, as well as subjectively by three pediatric radiologists for diagnostic acceptability using a four-point scale. Radiation dose and objective image qualities of each group were compared with the paired t-test. Diagnostic accuracy was evaluated by reviewing follow-up imaging studies and medical records in 2012 and 2013.

Results: There was 46.3% dose reduction of size-specific dose estimates in ASIR group (from 13.4 to 7.2 mGy) compared with the control group. Objective noise was higher in the liver, spleen and aorta of the ASIR group (P < 0.001). However, the subjective image quality was average or superior in 84-100% of studies. Only one image was subjectively rated as unacceptable by one reviewer. There was only one case with interpretational error in the control group and none in the ASIR group.

Conclusion: Use of the ASIR technique resulted in greater than a 45% reduction in radiation dose without impairing subjective image quality or diagnostic accuracy in pediatric abdominal CT, despite increased objective image noise.

Original languageEnglish
Pages (from-to)1541-1547
Number of pages7
JournalPediatric Radiology
Volume44
Issue number12
DOIs
Publication statusPublished - 2014 Nov 19

Fingerprint

Radiation
Pediatrics
Control Groups
Aorta
Noise
Spleen
Liver
Radio
Medical Records
Radiologists
Radiation Exposure

All Science Journal Classification (ASJC) codes

  • Pediatrics, Perinatology, and Child Health
  • Radiology Nuclear Medicine and imaging

Cite this

Bae, Sohi ; Kim, Myung Joon ; Yoon, Choon Sik ; Kim, Dong Wook ; Hong, Jung Hwa ; Lee, MiJung. / Effects of adaptive statistical iterative reconstruction on radiation dose reduction and diagnostic accuracy of pediatric abdominal CT. In: Pediatric Radiology. 2014 ; Vol. 44, No. 12. pp. 1541-1547.
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abstract = "Background: Since children are more radio-sensitive than adults, there is a need to minimize radiation exposure during CT exams.Objective: To evaluate the effects of adaptive statistical iterative reconstruction (ASIR) on radiation dose reduction, image quality and diagnostic accuracy in pediatric abdominal CT.Materials and methods: We retrospectively reviewed the abdominal CT examinations of 41 children (24 boys and 17 girls; mean age: 10 years) with a low-dose radiation protocol and reconstructed with ASIR (the ASIR group). We also reviewed routine-dose abdominal CT examinations of 41 age- and sex-matched controls reconstructed with filtered-back projection (control group). Image quality was assessed objectively as noise measured in the liver, spleen and aorta, as well as subjectively by three pediatric radiologists for diagnostic acceptability using a four-point scale. Radiation dose and objective image qualities of each group were compared with the paired t-test. Diagnostic accuracy was evaluated by reviewing follow-up imaging studies and medical records in 2012 and 2013.Results: There was 46.3{\%} dose reduction of size-specific dose estimates in ASIR group (from 13.4 to 7.2 mGy) compared with the control group. Objective noise was higher in the liver, spleen and aorta of the ASIR group (P < 0.001). However, the subjective image quality was average or superior in 84-100{\%} of studies. Only one image was subjectively rated as unacceptable by one reviewer. There was only one case with interpretational error in the control group and none in the ASIR group.Conclusion: Use of the ASIR technique resulted in greater than a 45{\%} reduction in radiation dose without impairing subjective image quality or diagnostic accuracy in pediatric abdominal CT, despite increased objective image noise.",
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Effects of adaptive statistical iterative reconstruction on radiation dose reduction and diagnostic accuracy of pediatric abdominal CT. / Bae, Sohi; Kim, Myung Joon; Yoon, Choon Sik; Kim, Dong Wook; Hong, Jung Hwa; Lee, MiJung.

In: Pediatric Radiology, Vol. 44, No. 12, 19.11.2014, p. 1541-1547.

Research output: Contribution to journalArticle

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AU - Kim, Myung Joon

AU - Yoon, Choon Sik

AU - Kim, Dong Wook

AU - Hong, Jung Hwa

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