title: Surgical planning of Isshiki type I thyroplasty using an open-source Digital Imaging and Communication in Medicine viewer OsiriX.
abstract: CONCLUSIONS
  Preoperative surgical planning of Isshiki type I thyroplasty with the Digital Imaging and Communication in Medicine (DICOM) viewer OsiriX can be used for strategic and predictable type I thyroplasty.
  
  
  OBJECTIVE
  The aim of this study was to determine the efficacy of the preoperative planning of type I thyroplasty using the DICOM viewer OsiriX.
  
  
  METHODS
  Five patients with unilateral vocal cord paralysis and severe breathy dysphonia were included in this study. Multidetector computed tomography (CT) DICOM data were obtained and breath holding was performed during image acquisition. Using three-dimensional multiplanar reconstruction, we outlined the optimal location for a window. Type I thyroplasty was performed using Isshiki's original method, and only the placement of the window was decided according to the preoperative simulation point. To verify the advantages of this method, we compared our data with the previous data for total operation time and voice quality at 3 months after the operation without the DICOM viewer planning.
  
  
  RESULTS
  All patients are free from dysphonia and their glottic closures have resolved satisfactorily. Postoperative CT revealed that appropriate implant positioning resulted in successful surgical intervention. The comparison of total operation time showed that with the new method, operation duration was shortened by 12 min.
authors.affiliation: Department of Otolaryngology, Yamaguchi University Graduate School of Medicine , Ube, Yamaguchi , Japan.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Hara
authors.forename: Takeshi
authors.initials: T
authors.lastname: Hori
authors.forename: Kazuma
authors.initials: K
authors.lastname: Sugahara
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yamashita
mesh_terms: D000368:Aged; D062485:Breath Holding; D015331:Cohort Studies; D055154:Dysphonia / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D058753:Laryngoplasty / Q000295:instrumentation*; D008297:Male; D008875:Middle Aged; D061330:Multidetector Computed Tomography; D025321:Surgery, Computer-Assisted / Q000295:instrumentation*; D016896:Treatment Outcome; D014826:Vocal Cord Paralysis / Q000000981:diagnostic imaging / Q000601:surgery*; D055815:Young Adult
keywords: Medialization laryngoplasty; computer simulation; surgical procedure