title: Prior Image Constrained Compressed Sensing Metal Artifact Reduction (PICCS-MAR): 2D and 3D Image Quality Improvement with Hip Prostheses at CT Colonography.
abstract: OBJECTIVE
  To assess the effect of the prior-image-constrained-compressed-sensing-based metal-artefact-reduction (PICCS-MAR) algorithm on streak artefact reduction and 2D and 3D-image quality improvement in patients with total hip arthroplasty (THA) undergoing CT colonography (CTC).
  
  
  METHODS
  PICCS-MAR was applied to filtered-back-projection (FBP)-reconstructed DICOM CTC-images in 52 patients with THA (unilateral, n = 30; bilateral, n = 22). For FBP and PICCS-MAR series, ROI-measurements of CT-numbers were obtained at predefined levels for fat, muscle, air, and the most severe artefact. Two radiologists independently reviewed 2D and 3D CTC-images and graded artefacts and image quality using a five-point-scale (1 = severe streak/no-diagnostic confidence, 5 = no streak/excellent image-quality, high-confidence). Results were compared using paired and unpaired t-tests and Wilcoxon signed-rank and Mann-Whitney-tests.
  
  
  RESULTS
  Streak artefacts and image quality scores for FBP versus PICCS-MAR 2D-images (median: 1 vs. 3 and 2 vs. 3, respectively) and 3D images (median: 2 vs. 4 and 3 vs. 4, respectively) showed significant improvement after PICCS-MAR (all P < 0.001). PICCS-MAR significantly improved the accuracy of mean CT numbers for fat, muscle and the area with the most severe artefact (all P < 0.001).
  
  
  CONCLUSIONS
  PICCS-MAR substantially reduces streak artefacts related to THA on DICOM images, thereby enhancing visualization of anatomy on 2D and 3D CTC images and increasing diagnostic confidence.
  
  
  CONCLUSIONS
  • PICCS-MAR significantly reduces streak artefacts associated with total hip arthroplasty on 2D and 3D CTC. • PICCS-MAR significantly improves 2D and 3D CTC image quality and diagnostic confidence. • PICCS-MAR can be applied retrospectively to DICOM images from single-kVp CT.
authors.affiliation: Department of Radiology, University of Wisconsin School of Medicine & Public Health, Madison, WI, USA. p.bannas@uke.de.|Department of Radiology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany. p.bannas@uke.de.
authors.forename: Peter
authors.initials: P
authors.lastname: Bannas
authors.affiliation: Department of Medical Physics, University of Wisconsin School of Medicine & Public Health, Madison, WI, USA.
authors.forename: Yinsheng
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Radiology, University of Wisconsin School of Medicine & Public Health, Madison, WI, USA.|Department of Radiology, University of Yamanashi, Yamanashi, Japan.
authors.forename: Utaroh
authors.initials: U
authors.lastname: Motosugi
authors.affiliation: Department of Radiology, University of Wisconsin School of Medicine & Public Health, Madison, WI, USA.|Department of Medical Physics, University of Wisconsin School of Medicine & Public Health, Madison, WI, USA.
authors.forename: Ke
authors.initials: K
authors.lastname: Li
authors.affiliation: Department of Radiology, University of Wisconsin School of Medicine & Public Health, Madison, WI, USA.
authors.forename: Meghan
authors.initials: M
authors.lastname: Lubner
authors.affiliation: Department of Radiology, University of Wisconsin School of Medicine & Public Health, Madison, WI, USA.|Department of Medical Physics, University of Wisconsin School of Medicine & Public Health, Madison, WI, USA.
authors.forename: Guang-Hong
authors.initials: GH
authors.lastname: Chen
authors.affiliation: Department of Radiology, University of Wisconsin School of Medicine & Public Health, Madison, WI, USA.
authors.forename: Perry J
authors.initials: PJ
authors.lastname: Pickhardt
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D019644:Arthroplasty, Replacement, Hip; D016477:Artifacts; D023881:Colonography, Computed Tomographic / Q000379:methods* / Q000592:standards; D044962:Data Compression; D005260:Female; D006621:Hip Joint / Q000000981:diagnostic imaging*; D006622:Hip Prosthesis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008297:Male; D008670:Metals; D008875:Middle Aged; D058996:Quality Improvement; D011856:Radiographic Image Enhancement / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods; D015203:Reproducibility of Results; D012189:Retrospective Studies
chemical_list: D008670:Metals
keywords: CT; CT colonography; Computed tomography; Metal artefact reduction; Total hip arthroplasty