title: [Multislice helical CT (MSCT) for mid-facial trauma: Optimization of parameters for scanning and reconstruction].
abstract: OBJECTIVE
  To determine the optimal scan parameters in multislice helical CT (MSCT) of the facial bone complex for both axial scanning and multiplanar reconstructions.
  
  
  METHODS
  An anthropomorphic skull phantom was examined with a MSCT. Axial scans were performed with continuously increasing collimations (4 x 1.25 - 4 x 2.5 mm), tube current (20 - 200 mA) and table speeds (3.75 mm/rot. and 7.5 mm/rot.). Multiplanar reconstructions in coronal and parasagittal planes with different reconstruction increment and slice thickness were evaluated in terms of image noise, contour artifacts and visualisation of anatomical structures.
  
  
  RESULTS
  The best image quality was obtained with a collimation of 4 x 1.25 mm and a table speed of 3.75 mm/rot. A reconstruction increment of 0.6 mm achieved the best time to image quality relation. With these parameters the bone structures were depicted in an optimal way without artifacts. The tube current could be reduced to 50 mA without significant loss of image quality. The optimized protocol was used for regular routine examinations in patients with facial trauma (n = 66).
  
  
  CONCLUSIONS
  Low-dose MSCT using thin collimation, low table speed and small reconstruction increments provides excellent data for both axial images and multiplanar reconstructions in patients with facial trauma. An additional examination in coronal orientation is therefore no longer necessary.
authors.affiliation: Abt. Röntgendiagnostik I, Georg-August-Universität Göttingen, Germany. s.dammert@gmx.de
authors.forename: S
authors.initials: S
authors.lastname: Dammert
authors.forename: M
authors.initials: M
authors.lastname: Funke
authors.forename: H A
authors.initials: HA
authors.lastname: Merten
authors.forename: S
authors.initials: S
authors.lastname: Obernauer
authors.forename: E
authors.initials: E
authors.lastname: Grabbe
mesh_terms: D000328:Adult; D016477:Artifacts; D005147:Facial Bones / Q000000981:diagnostic imaging / Q000293:injuries*; D005151:Facial Injuries / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D019047:Phantoms, Imaging; D012887:Skull Fractures / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed