Coronary artery calcium quantification with retrospectively gated helical CT: protocols and techniques

Area of Science:

• Radiology
• Cardiovascular Imaging
• Medical Physics

Background:

• Coronary vascular calcium assessment is crucial for cardiovascular risk stratification.
• Helical Computed Tomography (HCT) has evolved significantly for cardiac imaging.
• Cardiac gating techniques are essential for motion artifact reduction in cardiac CT.

Purpose of the Study:

• To review the development of retrospectively gated helical CT for coronary vascular calcium measurement.
• To discuss the impact of heart rate on helical pitch selection for diastolic imaging.
• To present the initial experience with cardiac gating in multidetector CT systems.

Main Methods:

• Review of retrospectively gated helical CT development on single-slice systems.
• Analysis of heart rate influence on helical pitch for diastolic image acquisition.
• Discussion of scanning and post-processing techniques for cardiac gating.
• Presentation of early clinical experience with multidetector CT cardiac gating.

Main Results:

• Retrospectively gated helical CT is a viable method for coronary vascular calcium quantification.
• Optimal helical pitch selection is dependent on heart rate for effective diastolic imaging.
• Cardiac gating techniques have been successfully adapted to multidetector CT systems.

Conclusions:

• Cardiac gating in conjunction with helical CT provides a robust method for coronary vascular calcium assessment.
• Understanding the interplay between heart rate, helical pitch, and gating is key for optimal image quality.
• The evolution towards multidetector CT has further enhanced the capabilities of cardiac gating for coronary imaging.