title: A new method for three-dimensional laparoscopic ultrasound model reconstruction.
abstract: BACKGROUND
  Laparoscopic ultrasound is an important modality in the staging of gastrointestinal tumors. Correct staging depends on good spatial understanding of the regional tumor infiltration. Three-dimensional (3D) models may facilitate the evaluation of tumor infiltration. The aim of the study was to perform a volumetric test and a clinical feasibility test of a new 3D method using standard laparoscopic ultrasound equipment.
  
  
  METHODS
  Three-dimensional models were reconstructed from a series of two-dimensional ultrasound images using either electromagnetic tracking or a new 3D method. The volumetric accuracy of the new method was tested ex vivo, and the clinical feasibility was tested on a small series of patients.
  
  
  RESULTS
  Both electromagnetic tracked reconstructions and the new 3D method gave good volumetric information with no significant difference. Clinical use of the new 3D method showed accurate models comparable to findings at surgery and pathology.
  
  
  CONCLUSIONS
  The use of the new 3D method is technically feasible, and its volumetrically, accurate compared to 3D with electromagnetic tracking.
authors.affiliation: Department of Surgical Gastroenterology, Odense University Hospital, Sdr. Boulevard, 5000 Odense, Denmark. claus@fristrup.net
authors.forename: C W
authors.initials: CW
authors.lastname: Fristrup
authors.forename: T
authors.initials: T
authors.lastname: Pless
authors.forename: J
authors.initials: J
authors.lastname: Durup
authors.forename: M B
authors.initials: MB
authors.lastname: Mortensen
authors.forename: H O
authors.initials: HO
authors.lastname: Nielsen
authors.forename: C P
authors.initials: CP
authors.lastname: Hovendal
mesh_terms: D004867:Equipment Design; D005240:Feasibility Studies; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000295:instrumentation; D010535:Laparoscopy; D008113:Liver Neoplasms / Q000000981:diagnostic imaging*; D010190:Pancreatic Neoplasms / Q000000981:diagnostic imaging*; D014463:Ultrasonography / Q000295:instrumentation / Q000379:methods