Abstract
OBJECTIVE. important decisions are made on the basis of CT angiographic
measurements of aneurysm size obtained after endovascular abdominal
aortic aneurysm repair; however, little is known about the variability
of these measurements. We evaluated the variability of CT angiographic
measurements of aneurysm size obtained after endovascular abdominal
aortic aneurysm repair. MATERIALS AND METHODS. Thirty CT angiographic
data sets were randomly chosen from 91 sets, including preoperative,
postoperative, and follow-up CT images. All images were obtained
according to a standardized acquisition protocol. On a workstation,
three parameters were measured: maximum aneurysm diameter, maximum
aneurysm cross-sectional area, and aneurysm volume. All data sets
were measured twice by two investigators in a random order. The difference
of each pair of measurements was plotted against the mean value.
The mean difference and its standard deviation were calculated with
a repeatability coefficient. RESULTS. The intraobserver repeatability
coefficient for observer 1 was 3.8 mm for diameter, 201.7 mm(2) for
cross-sectional area, and 5.6 mt for volume. For observer 2, these
figures were 3.0 mm, 219.0 mm(2), and S.1 mt, respectively. The interobserver
repeatability coefficients were 3.9 mm, 236.2 mm(2), and 10.3 mt.
CONCLUSION. Determination of the repeatability coefficient of aneurysm
size measurements obtained after endovascular abdominal aortic aneurysm
repair provides a good description of precision
Users
Please
log in to take part in the discussion (add own reviews or comments).