title: Accuracy of computer-aided measurements in endovascular stent-graft planning: an experimental study with two phantoms.
abstract: OBJECTIVE
  The aim of this study was to evaluate the accuracy of the new measurement software, created for aortic stent-graft planning. The software finds semiautomatically the centerline of the vessel from computer tomographic angiography data and calculates semiautomatically diameters and lengths.
  
  
  METHODS
  Two phantoms were constructed, scanned by CT and measured with the measurement software. Results were compared with the known dimensions of the phantoms and mean fractional errors were calculated. Linear regression analysis was also made between measured and known diameters.
  
  
  RESULTS
  The mean fractional error (+/- SD) for all diameter measurements combined was 0.017 +/- 0.011. In the linear regression analysis, was 1.000. For length measurements, the mean fractional error (+/- SD) was 0.009 +/- 0.0006.
  
  
  CONCLUSIONS
  The software enables accurate measurements perpendicular or parallel to the semiautomatically created centerline path.
authors.affiliation: Deparment of Diagnostic and International Radiology, Oulu University, Oulu, Finland. juhamatti.isokangas@ppshp.fi
authors.forename: Juha-Matti
authors.initials: JM
authors.lastname: Isokangas
authors.forename: Rami
authors.initials: R
authors.lastname: Hietala
authors.forename: Jukka
authors.initials: J
authors.lastname: Perälä
authors.forename: Osmo
authors.initials: O
authors.lastname: Tervonen
mesh_terms: D017544:Aortic Aneurysm, Abdominal / Q000000981:diagnostic imaging / Q000601:surgery*; D001807:Blood Vessel Prosthesis; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D021621:Imaging, Three-Dimensional; D019047:Phantoms, Imaging; D012680:Sensitivity and Specificity; D012984:Software; D015607:Stents; D014057:Tomography, X-Ray Computed