title: [Spiral CT in arytenoid cartilage dislocation: the optimization of the study parameters with a cadaver phantom and its clinical evaluation].
abstract: OBJECTIVE
  To evaluate an optimal scan protocol in a cadaver phantom and its clinical assessment in 40 patients.
  
  
  METHODS
  In a cadaver larynx phantom helical CT (HiSpeed Advantage; GE, Milwaukee, Wis) was performed with increasing collimation (1-10 mm) and pitch (1.0-3.0). 40 patients with an immobile vocal cord were randomly assigned to undergo CT with a certain protocol.
  
  
  RESULTS
  Best resolution was obtained with a collimation of 1 mm and pitch 1. The pitch could be increased up to 2 without losing information. With a collimation of 3 mm and higher, anatomical details were missed. In the patient studies a combination of 1 mm collimation with a pitch of 2.0 showed less motion artifacts than a pitch of 1.0.
  
  
  CONCLUSIONS
  The quality of CT imaging of the arytenoid cartilage depends greatly on the scanning parameters, the compliance of the patients and the mineralisation of the cartilage. For clinical assessment a collimation of 1 mm with a pitch of 2 is recommended. The increase pitch has the advantage of shorter acquisition times and decreased radiation exposure.
authors.affiliation: Abteilung Röntgendiagnostik, Klinikum, Georg-August-Universität Göttingen.
authors.forename: J
authors.initials: J
authors.lastname: Rodenwaldt
authors.forename: H H
authors.initials: HH
authors.lastname: Niehaus
authors.forename: L
authors.initials: L
authors.lastname: Kopka
authors.forename: E
authors.initials: E
authors.lastname: Grabbe
mesh_terms: D016477:Artifacts; D001193:Arytenoid Cartilage / Q000000981:diagnostic imaging* / Q000293:injuries*; D002102:Cadaver; D006801:Humans; D066298:In Vitro Techniques; D007818:Laryngeal Diseases / Q000000981:diagnostic imaging*; D008297:Male; D019047:Phantoms, Imaging; D011446:Prospective Studies; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D014832:Voice Disorders / Q000000981:diagnostic imaging
vernacular_title: Spiral-CT bei Aryknorpel-Dislokation: Optimeirung der Untersuchungsparameter am Leichenphantom und klinische Evaluation.