title: Dynamic imaging with dual-source gated Computed Tomography (CT): implications of motion parameters on image quality for wrist imaging.
abstract: OBJECTIVE
  Dynamic Computed Tomography (CT) promises insights into the pathophysiology of carpal instability by recording images of the carpus while it is in motion. The purpose of this study was to investigate the effect of motion velocity on image quality for dynamic carpal imaging applications using a clinical dual-source CT (DSCT) scanner.
  
  
  METHODS
  A phantom with targets in the axial, coronal and sagittal planes was attached to a motion simulator and imaged using a 64-slice DSCT scanner. Data was acquired when the phantom was stationary and during periodic linear motion. Spatial resolution, motion artifacts and banding artifacts were assessed.
  
  
  RESULTS
  Mean spatial resolution was 0.82 mm at 36 mm/s and 0.79 mm at 18 mm/s. Banding artifacts were mild at 36 mm/s and minimal at 18 mm/s. Motion artifacts were minimal at motion velocity of up to 36 mm/s in both the coronal and sagittal planes. Axial plane motion artifacts were moderate at 36 mm/s and mild at 18 mm/s.
  
  
  CONCLUSIONS
  Sub-millimeter resolution is achievable with commercially available DSCT scanners with mild to moderate amounts of motion artifacts at velocities of 18 mm/s and 36 mm/s respectively.
authors.affiliation: Wrist Analysis Research Laboratory, Singapore General Hospital, Singapore.
authors.forename: Puay Yong
authors.initials: PY
authors.lastname: Neo
authors.forename: Ita Suzana
authors.initials: IS
authors.lastname: Mat Jais
authors.forename: Christoph
authors.initials: C
authors.lastname: Panknin
authors.forename: Chin Cheung
authors.initials: CC
authors.lastname: Lau
authors.forename: Lai Peng
authors.initials: LP
authors.lastname: Chan
authors.forename: Kai Nan
authors.initials: KN
authors.lastname: An
authors.forename: Shian Chao
authors.initials: SC
authors.lastname: Tay
mesh_terms: D016477:Artifacts; D055424:Cardiac-Gated Imaging Techniques / Q000379:methods*; D004562:Electrocardiography; D056973:Four-Dimensional Computed Tomography / Q000379:methods*; D006801:Humans; D009068:Movement; D019047:Phantoms, Imaging; D014953:Wrist / Q000000981:diagnostic imaging*
keywords: 4DCT; Computed tomography; DSCT; Dual source CT; Image quality; Real-time imaging