Influences of Adaptive Statistical Iterative Reconstruction on Image Quality and Dose Reduction in Coronary Computed Tomography Angiography

Document Type : Original Article (s)

Authors

1 Student, Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran

2 Associate Professor, Department of Technology of Radiology, School of Paramedicine, Isfahan University of Medical Sciences, Isfahan, Iran

3 Department of Technology of Radiology, School of Paramedicine, Isfahan University of Medical Sciences, Isfahan, Iran

4 Alzahra Hospital, Isfahan University of Medical Sciences, Isfahan, Iran

Abstract

Background: The aim of this study was to evaluate the impact of using adaptive statistical iterative reconstruction (ASiR) method on image quality and reduction of organ doses, effective dose, and carcinogenesis risk from coronary computed tomography angiography (CCTA) in 64-slice CT scan.Methods: This cross-sectional study was performed on two groups of patients. The first group consisted of 185 patients (90 women and 95 men; mean age: 55.65 ± 14.77 years) who underwent CCTA with the conventional filter back projection (FBP) reconstruction. The second group consisted of 172 patients (80 women and 92 men; mean age: 58.59 ± 11.22 years) who were tested using ASiR reconstruction. Organ doses, effective dose, and carcinogenic risk were compared between the groups. Moreover, image quality criteria including noise, contrast-to-noise ratio, signal-to-noise ratio, CT numbers of the left coronary artery, and left ventricle were compared between the groups.Findings: There were at least 40% reduction in the effective dose (11.94 ± 5.64 vs. 20.38 ± 6.84 mSv; P < 0.001) and risk of carcinogenesis (8.97 ± 4.71 vs. 16.09 ± 8.42 in 10,000 people; P < 0.001) between the FBP and AsiR methods. No significant differences were observed between image quality parameters in the two reconstruction methods (P > 0.050).Conclusion: The application of ASiR method compared to conventional FBP method can reduce the dose of organs, the effective dose, and the carcinogenic risk of CCTA without compromising the image quality.

Keywords

References

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Journal of Isfahan Medical School
Volume 37, Issue 553 - Serial Number 553
November and December 2020
Pages 1286-1293

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History

  • Receive Date: 14 December 2019
  • Revise Date: 02 May 2024
  • Accept Date: 06 April 2022

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