Patient-Specific AAA Wall Stress Analysis: 99-Percentile Versus Peak Stress

The 3D active object of the centerline (left), the lumen (middle) and the AAA wall (right).

Left: Failure of the automatic segmentation into the vena cava (thin solid line) and manual corrected contour (solid dotted line). Right: Corrected contour.

Posterior view of the stress distributions for two patients for operators 1, 2 and 3.

The mean and standard deviation of the peak stress and 99-percentile stress for the 5 analyses of all patients as determined by operator 1 (left) and 2 (right).

Bland–Altman plots for operators 1, 2 and 3 (- - indicates one standard deviation).

Linear regression between the 99-percentile stress and the maximum diameter (left, - - indicates one standard deviation) and the residuals of the regression model, normalized to the standard deviation of the residuals (right).

A–E ‘high stress AAAs’ with stresses more than one standard deviation above the regression model. F–I ‘low stress AAAs’ with stresses below the regression model.