Vascular Laboratory and Imaging

Agreement between Computed Tomography and Ultrasound on Abdominal Aortic Aneurysms and Implications on Clinical Decisions

Foo FJ, Hammond CJ, Goldstone AR, et al (Leeds Teaching Hosps NHS Trust, UK; et al) Eur J Vasc Endovasc Surg 42:608–614, 2011^§

Abstract

Objectives

The United Kingdom abdominal aortic aneurysm (AAA) screening programme refers aneurysms with ultrasound (US) diameters of ≥5.5 cm to vascular services for consideration of computed tomography (CT) and intervention. We investigated the discrepancy between US and CT, implications on clinical decisions and question at which stage CT be used.

Design/Methods

AAA USs over 5 years were retrospectively analysed. Patients included had aneurysms measuring ≥5 cm on US with subsequent CT within 2 months (n = 123). Based on maximum US diameters, 44 patients had aneurysms between 5 and 5.4 cm (group I) and 79 patients ≥5.5 cm (group II). Results were cross-referenced. Correlation and limits of agreement were calculated. Two radiologists re-measured 44 pairs of CT/US scans and the inter-observer bias in determining discrepancies between imaging modalities calculated.

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