ECG-gated Versus Non-ECG-gated High-pitch Dual-source CT for Whole Body CT Angiography (CTA)

Area of Science:

• Cardiovascular Imaging
• Radiology
• Medical Physics

Background:

• High-pitch dual-source computed tomography angiography (CTA) is a rapid imaging technique.
• Electrocardiographic (ECG) gating is often used to minimize motion artifacts in cardiac imaging.
• The necessity of ECG gating for whole aorta CTA using high-pitch dual-source technology requires investigation.

Purpose of the Study:

• To compare image quality and motion artifacts between ECG-gated and non-ECG-gated high-pitch dual-source CTA of the whole aorta.
• To assess the diagnostic performance for evaluating aortic pathologies with both protocols.
• To determine practical differences and radiation dose implications.

Main Methods:

• Two groups of 40 patients each underwent either ECG-gated or non-ECG-gated high-pitch dual-source CTA of the whole aorta.
• Independent assessment of motion artifacts, aortic annulus, valve, coronary ostia, and vascular contrast by two readers.
• Objective analysis of image noise and signal-to-noise ratio.

Main Results:

• No significant motion artifacts were observed in either the ECG-gated or non-ECG-gated groups.
• Image acquisition parameters, including radiation dose, were comparable between the two protocols.
• The aortic annulus, valve, coronary ostia, and distal vasculature were reliably visualized in all patients.

Conclusions:

• High-pitch dual-source CTA of the whole aorta is a robust imaging strategy.
• ECG gating is not essential for achieving high-quality imaging in this specific application.
• The technique is dose-efficient and suitable for evaluating aortic pathologies regardless of gating strategy.