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

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• 作者：Minwook Lee ; Myung-Joon Kim ; Kyung Hwa Han ; Mi-Jung Lee
• 关键词：Computed tomography ; Radiation dose ; Image quality ; Iterative reconstruction ; Children
• 刊名：Pediatric Radiology
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：45
• 期：2
• 页码：188-193
• 全文大小：335 KB
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• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Imaging and Radiology
  Pediatrics
  Neuroradiology
  Nuclear Medicine
  Ultrasound
  Oncology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1998

文摘

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--3:8; mean age 8.2?±-.7?years) underwent dual-source abdominal CT (mean effective dose 4.8?±-.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.