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High-pitch dual-source CT angiography of the whole aorta without ECG synchronisation: initial experience

Martin Beeres1, Boris Schell, Aristidis Mastragelopoulos

  • 1Department of Diagnostic and Interventional Radiology, Clinic of the Goethe University, Haus 23C UG, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany. beeres@gmx.net

European Radiology
|September 15, 2011
PubMed

Insights

High-pitch dual-source CT angiography enables motion-free whole aorta imaging without ECG synchronization. This feasible technique offers improved image quality and reduced scan times, potentially becoming a standard for trans-catheter aortic valve implantation pre-procedural assessment.

Area of Science:

  • Radiology
  • Medical Imaging
  • Cardiovascular Imaging

Background:

  • Computed Tomography Angiography (CTA) is crucial for aortic assessment.
  • ECG synchronization is typically used to minimize motion artifacts in CTA.
  • High-pitch techniques offer faster scanning but may compromise image quality.

Purpose of the Study:

  • To evaluate the feasibility, image quality, and radiation dose of high-pitch dual-source CT angiography (CTA) for the entire aorta.
  • To assess the effectiveness of high-pitch CTA without ECG synchronization.

Main Methods:

  • A comparative study involving 120 patients divided into three groups.
  • Group 1: 16-slice CT, Group 2: Dual-source CT (conventional pitch), Group 3: Dual-source CT (high-pitch, 3.0).
  • Independent assessment of motion and stair-step artifacts by two readers.

Main Results:

  • High-pitch CTA significantly reduced motion and artifacts compared to conventional protocols (p < 0.05).
  • Imaging time was significantly shorter in the high-pitch group (1.7s vs. 7.4s vs. 12.2s).
  • Ascending aorta and coronary ostia were reliably visualized without motion artifacts in the high-pitch group.

Conclusions:

  • High-pitch dual-source CTA of the whole aorta is feasible in unselected patients.
  • Motion-free aortic imaging is achievable without ECG synchronization using this technique.
  • This CT mode shows potential as a standard protocol for pre-trans-catheter aortic valve implantation (TAVI) assessment.
Abstract

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