New post-imaging software provides fast and accurate volume data
from CTA surveillance after endovascular aneurysm repair
Journal of Endovascular Therapy, 10 (5):
887-893 (2003)Abstract
Purpose: 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 similar to400
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