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European Radiology

, Volume 21, Issue 1, pp 205–212 | Cite as

High-pitch dual-source CT angiography of the aortic valve-aortic root complex without ECG-synchronization

  • Christoph Karlo
  • Sebastian Leschka
  • Robert Paul Goetti
  • Gudrun Feuchtner
  • Lotus Desbiolles
  • Paul Stolzmann
  • Andre Plass
  • Volkmar Falk
  • Borut Marincek
  • Hatem Alkadhi
  • Stephan Baumüller
Vascular-Interventional

Abstract

Purpose

To compare image quality and radiation dose of high-pitch computed tomography angiography(CTA) of the aortic valve-aortic root complex with and without prospective ECG-gating compared to a retrospectively ECG-gated standard-pitch acquisition.

Materials and Methods

120 patients(mean age 68 ± 13 years) were examined using a 128-slice dual-source CT system using prospectively ECG-gated high-pitch(group A; n = 40), non-ECG-gated high-pitch(group B; n = 40) or retrospectively ECG-gated standard-pitch(C; n = 40) acquisition techniques. Image quality of the aortic root, valve and ascending aorta including the coronary ostia was assessed by two independent readers. Image noise was measured, radiation dose estimates were calculated.

Results

Interobserver agreement was good(κ = 0.64–0.78). Image quality was diagnostic in 38/40 patients(group A), 37/40(B) and 38/40(C) with no significant difference in number of patients with diagnostic image quality among all groups (p = 0.56). Significantly more patients showed excellent image quality in group A compared to groups B and C(each, p < 0.01). Average image noise was significantly different between all groups(p < 0.05). Mean radiation dose estimates in groups A and B(each; 2.4 ± 0.3 mSv) were significantly lower compared to group C(17.5 ± 4.4 mSv; p < 0.01).

Conclusion

High-pitch dual-source CTA provides diagnostic image quality of the aortic valve-aortic root complex even without ECG-gating at 86% less radiation dose when compared to a standard-pitch ECG-gated acquisition.

Keywords

Dual-source computed tomography DSCT High pitch Radiation dose Aortic valve 

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Copyright information

© European Society of Radiology 2010

Authors and Affiliations

  • Christoph Karlo
    • 1
  • Sebastian Leschka
    • 1
  • Robert Paul Goetti
    • 1
  • Gudrun Feuchtner
    • 1
  • Lotus Desbiolles
    • 1
  • Paul Stolzmann
    • 1
  • Andre Plass
    • 2
  • Volkmar Falk
    • 2
  • Borut Marincek
    • 1
  • Hatem Alkadhi
    • 1
    • 3
  • Stephan Baumüller
    • 1
  1. 1.Institute of Diagnostic and Interventional RadiologyUniversity Hospital ZurichZurichSwitzerland
  2. 2.Clinic for Cardiovascular SurgeryUniversity Hospital ZurichZurichSwitzerland
  3. 3.Cardiac MR PET CT GroupMassachusetts General Hospital and Harvard Medical SchoolBostonUSA

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