title: New post-imaging software provides fast and accurate volume data from CTA surveillance after endovascular aneurysm repair.
abstract: OBJECTIVE
  To quantify intra- and interobserver variabilities when measuring total aneurysm volume after endovascular aneurysm repair using the Vitrea 2 System and to compare it in terms of accuracy and processing time with the gold standard methods using the Easy Vision workstation.
  
  
  METHODS
  Total aneurysm volumes from 30 postendograft CTA datasets were randomly selected from a database consisting of approximately 400 CTA datasets recorded in 89 patients. The intra- and interobserver variabilities were measured on the Vitrea workstation by 2 investigators. The intermodality variability was calculated for the same measurements using the Easy Vision workstation. The differences of each pair of measurements were plotted against their mean, and the repeatability coefficient (RC) was calculated. The mean differences were also expressed as a percentage of the first measurements.
  
  
  RESULTS
  The intraobserver mean difference was 1.6 mL (1.4%) with an RC of 10.8 mL (10.1%) and the interobserver mean difference was -1.4 mL (-1.4%) with an RC of 11.7 mL (10.2%). The intermodality mean difference was 1.8 mL (2.0%) with an RC of 15.8 mL (11.1%). The Vitrea workstation required a median of 8 minutes (interquartile range 7-10) for 1 observer and 6 minutes (interquartile range 5-8) for the other to perform a complete volume segmentation of each patient dataset compared to an estimated average of 30 minutes using the Easy Vision workstation.
  
  
  CONCLUSIONS
  The Vitrea workstation provides fast and accurate volume data from spiral CTA follow-up of endovascular aneurysm repair. This software may enhance the acceptability of volume surveillance in daily practice.
authors.affiliation: Department of Vascular Surgery, University Medical Center Utrecht, The Netherlands.
authors.forename: Kay K
authors.initials: KK
authors.lastname: Yeung
authors.forename: Maarten J
authors.initials: MJ
authors.lastname: van der Laan
authors.forename: Jan J
authors.initials: JJ
authors.lastname: Wever
authors.forename: Paul F G M
authors.initials: PF
authors.lastname: van Waes
authors.forename: Jan D
authors.initials: JD
authors.lastname: Blankensteijn
mesh_terms: D000368:Aged; D017544:Aortic Aneurysm, Abdominal / Q000000981:diagnostic imaging* / Q000601:surgery*; D001027:Aortography / Q000379:methods* / Q000706:statistics & numerical data; D005500:Follow-Up Studies; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D015588:Observer Variation; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012984:Software; D013997:Time Factors; D014057:Tomography, X-Ray Computed / Q000706:statistics & numerical data