Assessment of vascular contrast and wall motion of the aortic root and ascending aorta on MDCT angiography: Dual-source high-pitch vs non-gated single-source acquisition schemes

Published

Journal Article

Objectives: This retrospective study assessed whether dual-source high-pitch computed tomographic angiography (CTA) offered advantages over single-source standard-pitch techniques in the evaluation of the ascending aorta. Methods: Twenty patients who received both thoracic dual-source high-pitch and single-source standard-pitch CTAs within 1 year were assessed. Dual-source CTAs were performed; standard-pitch imaging used dose-modulated 120 kVp/150 mAs and 0.8 pitch compared with high-pitch protocols employing dose-modulated 120 kVp/250 mAs and 2.4 target pitch. Radiation dose was documented. Contrast-to-noise ratios (CNRs) at sinuses of the Valsalva (CNR Valsalva) and ascending aorta (CNRAorta) were calculated. Dose/CNR for each technique was compared with paired t-tests. Motion at aortic valve, aortic root and ascending aorta were assessed with four-point scales and Mann-Whitney U tests; longitudinal extension of motion was compared with paired t-tests. Results: Significantly lower motion scores for high-pitch, compared with standard-pitch acquisitions for aortic annulus, 0 vs. 2, aortic root, 0 vs. 3, and ascending aorta, 0 vs. 2, were achieved. Significantly reduced longitudinal extension of motion at aortic root, 4.9 mm vs 15.7 mm, and ascending aorta, 4.9 mm vs 21.6 mm, was observed. Contrast was not impacted: CNRValsalva, 45.6 vs 46.3, and CNRAorta, 45.3 vs 47.1. CTDIvol was significantly decreased for high-pitch acquisitions, 13.9 mGy vs 15.8 mGy. Conclusions: Dual-source high-pitch CTAs significantly decreased motion artefact without negatively impacting vascular contrast and radiation dose. Key Points: • Dual-source high-pitch CTA significantly decreased motion artefact of the ascending aorta. • Dual-source high-pitch CTA did not negatively impact on vascular contrast. • Dual-source high-pitch CTA significantly decreased radiation dose compared with single-source standard-pitch acquisitions. © 2014 European Society of Radiology.

Full Text

Duke Authors

Cited Authors

  • Christensen, JD; Seaman, DM; Lungren, MP; Hurwitz, LM; Boll, DT

Published Date

  • January 1, 2014

Published In

Volume / Issue

  • 24 / 5

Start / End Page

  • 990 - 997

Electronic International Standard Serial Number (EISSN)

  • 1432-1084

International Standard Serial Number (ISSN)

  • 0938-7994

Digital Object Identifier (DOI)

  • 10.1007/s00330-014-3120-2

Citation Source

  • Scopus