title: Patient dose and image quality in low-dose abdominal CT: a comparison between iterative reconstruction and filtered back projection.
abstract: BACKGROUND
  In computed tomography (CT), there is increasing concern for potential CT radiation hazards. Several raw-data-based iterative reconstruction techniques attempt to facilitate low-dose imaging without compromising image quality, which raises the question whether these techniques may allow further dose reduction.
  
  
  OBJECTIVE
  To compare image quality of iterative reconstruction and filtered back projection in low-dose abdominal CT and study the potential for further dose reduction.
  
  
  METHODS
  Forty-five patients underwent CT of the abdomen twice: with standard low-dose technique and with 30% reduced dose, using both iterative reconstruction and filtered back projection. Four radiologists made pair-wise image quality assessment using five visual criteria. Visual grading regression (VGR) and weighted kappa (κ w) were used to analyze the data.
  
  
  RESULTS
  There were significant effects of log(mAs) (P <0.001) and reconstruction algorithm (P <0.01) on all image quality criteria with an estimated potential dose reduction of 5-9%. Inter-observer agreement ranged from 70% to 91% and κ w from -0.01 to 0.57.
  
  
  CONCLUSIONS
  An iterative reconstruction algorithm improved image quality in abdominal CT, but the estimated dose reduction was rather small. The full potential of the algorithm remains unclear.
authors.affiliation: Vrinnevi Hostpital, Norrköping Department of Medicine and Health (IMH), Linköping University, Linköping Bharti.Kataria@lio.se.
authors.forename: Bharti
authors.initials: B
authors.lastname: Kataria
authors.affiliation: Department of Medicine and Health (IMH), Linköping University, Linköping Center for Medical Image Science and Visualization (CMIV), Linköping University, Linköping, Sweden.
authors.forename: Orjan
authors.initials: O
authors.lastname: Smedby
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011829:Radiation Dosage; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D011860:Radiography, Abdominal / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*
keywords: Computed tomography; filtered back projection (FBP); image quality; iterative reconstruction