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

Publication
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.
Objectives
To assess the efficacy of fine focal spot imaging in calcification beam-hardening artefact reduction and vessel clarity on CT abdominal angiography (CTAA).

Methods
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. 

Results
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).

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

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