title: Iterative Reconstruction Results in Larger Computed Tomography Measurements of Iliofemoral Artery Diameter in Patients Referred for Transcatheter Aortic Valve Replacement.
abstract: OBJECTIVE
  We hypothesized that improved iterative reconstruction increases image quality and reduces artifacts for iliofemoral artery computed tomography imaging in patients referred for transcatheter aortic valve replacement (TAVR).
  
  
  METHODS
  We examined 56 consecutive patients undergoing computed tomography for possible TAVR and compared image quality and iliofemoral artery size between adaptive statistical iterative reconstructions (ASIRs) and improved model-based iterative reconstructions (MBIRs).
  
  
  RESULTS
  Model-based iterative reconstruction (vs ASIR) was associated with improved (P < 0.001 for each) image quality (3.4 ± 0.8 vs 2.8 ± 1.0), beam hardening (3.5 ± 0.8 vs 3.0 ± 1.1), and wall definition (3.6 ± 0.6 vs 3.1 ± 0.8). Image signal-to-noise ratios (20.4 ± 10.1 vs 13.7 ± 6.6, P < 0.001) were also increased with MBIR as compared with ASIR. Mean iliofemoral artery size was larger using MBIR compared with ASIR (left, 7.7 ± 1.5 vs 7.4 ± 1.7 mm, P < 0.001; right, 7.8 ± 1.2 vs 7.4 ± 1.5 mm, P = 0.008).
  
  
  CONCLUSIONS
  In patients referred for TAVR, improved MBIR resulted in higher image quality, reduced artifacts, and larger iliofemoral artery diameters compared with standard iterative reconstructions.
authors.affiliation: From the Departments of *Medicine and †Radiology, University of Michigan, Ann Arbor, MI; and ‡Department of Anesthesiology, Cedars-Sinai Medical Center, Los Angeles, CA.
authors.forename: Anum
authors.initials: A
authors.lastname: Minhas
authors.forename: Smita
authors.initials: S
authors.lastname: Patel
authors.forename: Ella A
authors.initials: EA
authors.lastname: Kazerooni
authors.forename: Antonio H
authors.initials: AH
authors.lastname: Conte
authors.forename: Troy M
authors.initials: TM
authors.lastname: LaBounty
mesh_terms: D000368:Aged; D000465:Algorithms; D016477:Artifacts; D000072226:Computed Tomography Angiography / Q000379:methods*; D005260:Female; D005263:Femoral Artery / Q000000981:diagnostic imaging*; D006801:Humans; D007083:Iliac Artery / Q000000981:diagnostic imaging*; D008297:Male; D011300:Preoperative Care / Q000379:methods; D017755:Prosthesis Fitting / Q000379:methods; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D012017:Referral and Consultation; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D065467:Transcatheter Aortic Valve Replacement / Q000379:methods*