title: X-ray dose reduction in abdominal computed tomography using advanced iterative reconstruction algorithms.
abstract: OBJECTIVE
  This work aims to explore the effects of adaptive statistical iterative reconstruction (ASiR) and model-based iterative reconstruction (MBIR) algorithms in reducing computed tomography (CT) radiation dosages in abdominal imaging.
  
  
  METHODS
  CT scans on a standard male phantom were performed at different tube currents. Images at the different tube currents were reconstructed with the filtered back-projection (FBP), 50% ASiR and MBIR algorithms and compared. The CT value, image noise and contrast-to-noise ratios (CNRs) of the reconstructed abdominal images were measured. Volumetric CT dose indexes (CTDIvol) were recorded.
  
  
  RESULTS
  At different tube currents, 50% ASiR and MBIR significantly reduced image noise and increased the CNR when compared with FBP. The minimal tube current values required by FBP, 50% ASiR, and MBIR to achieve acceptable image quality using this phantom were 200, 140, and 80 mA, respectively. At the identical image quality, 50% ASiR and MBIR reduced the radiation dose by 35.9% and 59.9% respectively when compared with FBP.
  
  
  CONCLUSIONS
  Advanced iterative reconstruction techniques are able to reduce image noise and increase image CNRs. Compared with FBP, 50% ASiR and MBIR reduced radiation doses by 35.9% and 59.9%, respectively.
authors.affiliation: Department of Radiology, Henan Provincial People's Hospital, Zhengzhou, Henan, China.
authors.forename: Peigang
authors.initials: P
authors.lastname: Ning
authors.affiliation: Department of Radiology, Henan Provincial People's Hospital, Zhengzhou, Henan, China.
authors.forename: Shaocheng
authors.initials: S
authors.lastname: Zhu
authors.affiliation: Department of Radiology, Henan Provincial People's Hospital, Zhengzhou, Henan, China.
authors.forename: Dapeng
authors.initials: D
authors.lastname: Shi
authors.affiliation: Department of Radiology, Henan Provincial People's Hospital, Zhengzhou, Henan, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Guo
authors.affiliation: Department of Radiology, Henan Provincial People's Hospital, Zhengzhou, Henan, China.
authors.forename: Minghua
authors.initials: M
authors.lastname: Sun
mesh_terms: D000465:Algorithms; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008297:Male; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011860:Radiography, Abdominal / Q000379:methods*; D059629:Signal-To-Noise Ratio; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014965:X-Rays