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Efficacy of ‘fine’ focal spot imaging in CT abdominal angiography

Philips CT Clinical Science Philips Healthcare • USA

Oh LCW, Lau KK, Devapalasundaram A, Buchan K, Ardley N, Huynh M.

* This study originally published online on August 6, 2014 in European Radiology.
To assess the efficacy of fine focal spot imaging in calcification beam-hardening artefact reduction and vessel clarity on CT abdominal angiography (CTAA).

Adult patients of any age and gender who presented for CTAA were included. Thirty-nine patients were examined with a standard focal spot size (SFSS) of 1 x 1 mm in the first three month while 31 consecutive patients were examined with a fine focal spot size (FFSS) of 1 x 0.5 mm in the following three months. Vessel clarity and calcification beam-hardening artefacts of the abdominal aorta, celiac axis, superior mesenteric artery, renal arteries, and iliac arteries were assessed using a 5-point grading scale by two blinded radiologists randomly. 

Cohen's Kappa test indicated that on average, there was substantial agreement among reviewers for vessel wall clarity and calcification artefact grading. Mann-Whitney test showed that there was a significant difference between the two groups, with FFSS performing significantly better for vessel clarity (U, 6481.50; p<0.001; t, 0.73) and clarification artefact reduction (U, 1916; p<0.001; r, 0.77).

Fine focus CT angiography produces images with better vessel wall clarity and less vessel calcification beam-hardening artefact.
For more information about this publication, check out the PubMed listing for this article.

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Aug 18, 2014

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abdomen, abdomen CTA, aorta, artifacts, Body, calcification, iliac arteries, kidney/renal CTA, Vascular

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