title: [Simulation and experimental study of cone artifact in spiral CT].
abstract: OBJECTIVE
  To study regular patterns of cone artifact resulted from interpolation algorithm of spiral CT.
  
  
  METHODS
  Based on the principle of interpolation algorithm and back-projection reconstruction, a mathematical model of the reconstructed image was established to clarify the relation of the scanning parameters and the characteristics of the scanned object with the cone artifact. Experiments were carried out by a set of acrylic phantoms on siemens plus 4 CT scanners.
  
  
  RESULTS
  The artifact in the image was directly proportional to the table increment per gantry rotation of the scanner, and was positively correlated to the tangent of half cone-angle and inversely to the radii in the reconstruction plane of the phantom. The theoretical analysis was validated by experimental results.
  
  
  CONCLUSIONS
  The cone artifact is related to the scanning parameters and the characteristics of the scanned object.
authors.affiliation: School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China. linyiqun@fimmu.com
authors.forename: Yi-qun
authors.initials: YQ
authors.lastname: Lin
authors.forename: Ke-cheng
authors.initials: KC
authors.lastname: Yang
authors.forename: Xiao-e
authors.initials: XE
authors.lastname: Yu
mesh_terms: D000465:Algorithms; D016477:Artifacts; D003198:Computer Simulation; D007091:Image Processing, Computer-Assisted / Q000379:methods* / Q000592:standards; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D036542:Tomography, Spiral Computed / Q000295:instrumentation / Q000379:methods*