title: A stationary computed tomography system with cylindrically distributed sources and detectors.
abstract: BACKGROUND
  The temporal resolution of current computed tomography (CT) systems is limited by the rotation speed of their gantries.
  
  
  OBJECTIVE
  A helical interlaced source detector array (HISDA) CT, which is a stationary CT system with distributed X-ray sources and detectors, is presented in this paper to overcome the aforementioned limitation and achieve high temporal resolution.
  
  
  METHODS
  Projection data can be obtained from different angles in a short time and do not require source, detector, or object motion. Axial coverage speed is increased further by employing a parallel scan scheme. Interpolation is employed to approximate the missing data in the gaps, and then a Katsevich-type reconstruction algorithm is applied to enable an approximate reconstruction.
  
  
  RESULTS
  The proposed algorithm suppressed the cone beam and gap-induced artifacts in HISDA CT. The results also suggest that gap-induced artifacts can be reduced by employing a large helical pitch for a fixed gap height.
  
  
  CONCLUSIONS
  HISDA CT is a promising 3D dynamic imaging architecture given its good temporal resolution and stationary advantage.
authors.affiliation: School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Chen
authors.affiliation: School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xi
authors.affiliation: School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
mesh_terms: D000465:Algorithms; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D019047:Phantoms, Imaging; D036542:Tomography, Spiral Computed / Q000295:instrumentation* / Q000379:methods*
keywords: Katsevich-type algorithm; Stationary CT; distributed X-ray sources; dynamic imaging; temporal resolution