Variability of vascular CT measurement techniques used in the assessment abdominal aortic aneurysms

Measurement of Maximum Diameter of Native Abdominal Aortic Aneurysm by Angio-CT: Reproducibility is Better with the Semi-automated Method

“…Several studies have reported that software providing planes perpendicular the lumen centreline makes it possible to increase the reproducibility of the measurement. 2,7 Our results are only partially in accordance with these conclusions. With the semi-automated method, the mean diameters did not statistically differ between observers in our study.…”

“…Semi-automatic generation of the centreline by most software programs usually corresponds to the AAA lumen centreline, as it follows the path of the contrast medium in the aortic lumen. 2,7 The software we used in this study also created the lumen centreline. However, the AAA lumen centreline may differ from the actual centreline if the thrombus is asymmetrical, therefore leading to inaccurate aneurysmal cross sections.…”

“…Semi-automated softwares have been introduced for this purpose. 2,3,7,8 In our radiology department, we use a three-dimensional (3D) analysis software, which creates the abdominal aortic lumen centreline once the observer has placed two points at the celiac aortic level and the aortic bifurcation, and then the software automatically provides cross sections perpendicular to this centreline. The cross section containing the maximum aortic diameter in any direction perpendicular to the lumen centreline is visually selected by the observer, who then manually draws the outer limits of the AAA, including thrombus and the arterial wall.…”

Predicting vascular complications during transfemoral transcatheter aortic valve replacement using computed tomography: A novel area‐based index

“…Per the methodology described by Bland and Altman, the difference between the observer's original and repeat measurements was calculated, followed by mean difference for analysis of intra‐observer variability; a similar approach was adopted for inter‐observer analysis . Pitman's test of difference in variance was used for statistical comparisons.…”

Variation in the Size of Abdominal Aorta Measured on Computed Tomography

“…CT has become an important pre-operative imaging technique well as less operator dependent and more objective [4,9]. CT has various tools and techniques to measure the size of arteries [10][11][12], while in the present study, 2D axial sections were taken to measure the variation in size of the abdominal aorta.…”