Dual-Source Dual-Energy CT Angiography of the Supra-Aortic Arteries with Tin Filter: Impact of Tube Voltage Selection

Academic Radiology
A KornChristoph Thomas

Abstract

Automatic bone and plaque subtraction (BPS) in computed tomographic angiographic (CTA) examinations using dual-energy CT (DECT) remains challenging because of beam-hardening artifacts in the shoulder region and close proximity of the internal carotid artery to the base of the skull. The selection of the tube voltage combination in dual-source CT influences the spectral separation and the susceptibility for artifacts. The purpose of this study was to assess which tube voltage combination leads to an optimal image quality of head and neck DECT angiograms after bone subtraction. Fifty-one patients received tin-filter-enhanced DECT angiograms of the supra-aortic arteries using two voltage protocols: 24 patients were studied using 80/Sn140 kV and 27 using a 100/Sn140 kV protocol, both protocols with an additional tin filter. A commercially available DE-CTA BPS algorithm was used. Artificial vessel erosions in BPS maximum intensity projections (four-level Likert scale with CTA source data as reference) and vessel signal-to-noise ratio (SNR) were assessed in the level of the shoulders and the base of the skull in each patient and compared. At the level of the shoulder, 100/Sn140 kV achieved higher SNR (23.4 ± 6.4 at 80/Sn140 kV vs. 35...Continue Reading

References

Nov 18, 2003·European Radiology·Zishu ZhangHannu I Manninen
Dec 13, 2005·European Radiology·Thomas G FlohrBernd M Ohnesorge
Dec 8, 2006·European Radiology·Thorsten R C JohnsonChristoph R Becker
Jun 10, 2009·Neuroradiology·Anisa MnyusiwallaSean P Symons
Oct 23, 2010·AJR. American Journal of Roentgenology·Andrew N PrimakCynthia H McCollough
Oct 26, 2012·AJR. American Journal of Roentgenology·Boris SchulzRalf Bauer

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