Coronary imaging techniques with emphasis on CT and MRI

Area of Science:

• Medical imaging
• Pediatric cardiology
• Radiology

Background:

• Coronary artery imaging in children presents unique challenges due to high heart rates and small anatomical structures.
• Conventional coronary angiography, while the benchmark, is invasive.
• Computed tomography (CT) and magnetic resonance imaging (MRI) have gained prominence in pediatric coronary imaging over the last decade.

Purpose of the Study:

• To review and discuss the technical requirements, advantages, and disadvantages of CT and MRI for pediatric coronary artery imaging.
• To compare these non-invasive techniques with conventional coronary angiography.

Main Methods:

• Review of current literature on CT and MRI for coronary artery imaging in children.
• Discussion of hardware requirements, including scanner specifications (e.g., 64-channel CT).
• Analysis of image quality optimization, dose reduction strategies (e.g., electrocardiographic triggering in CT), and emerging MRI techniques.

Main Results:

• CT requires at least a 64-channel scanner, with temporal resolution being critical for image quality and radiation dose reduction.
• Electrocardiographic (ECG) triggering modes have been developed to minimize radiation exposure in CT.
• MRI, a non-ionizing radiation technique, shows promise for screening congenital coronary anomalies but is not yet feasible in infants.

Conclusions:

• CT and MRI are valuable non-invasive tools for pediatric coronary artery imaging, each with specific technical demands.
• MRI is recommended for suspected congenital coronary anomalies in experienced centers, but CT remains a viable option with dose reduction strategies.
• Further technical advancements are needed, particularly for MRI in younger children.