Abdominal aortic aneurysm diameter: A comparison of ultrasound measurements with those from standard and three-dimensional computed tomography reconstruction

Differing diameter measurements according to axis. Clockwise from left: maximum anteroposterior, maximum ellipse and perpendicular to maximum ellipse, perpendicular to the centerline of flow, and three-dimensional reconstruction along the axis of the centerline of flow.

Correlation between computed tomography (CT) anteroposterior (AP) measurement and ultrasound AP measurement. Correlation coefficient was 0.91.

Bland-Altman plots illustrate the bias towards smaller mean diameter measurements for AP ultrasound (US) when compared with computed tomography (CT) in different planes (A) anteroposterior (AP) (B) maximum ellipse (ME), (C) perpendicular to the centerline of flow (PCLF), (D) perpendicular to the maximum ellipse (PME). Differences between CT measurements are also shown in (E) CT-AP vs CT-PCLF and (F) CT PCLF vs CT PME. Note that the x-axis range varies between plots.