Cardiac MR imaging: a guide for the beginner

Area of Science:

• Cardiovascular Imaging
• Radiology
• Medical Physics

Background:

• Cardiac motion during contraction poses significant challenges for diagnostic radiologists and magnetic resonance (MR) imaging technology.
• Acquisition of diagnostic-quality cardiac MR images is hindered by complex heart movements.
• Electrocardiographic (ECG) gating is a critical technique to overcome motion artifacts.

Purpose of the Study:

• To highlight the importance of ECG gating in cardiac MR imaging for diagnostic image quality.
• To provide guidance on optimizing ECG gating signal quality through proper electrode placement and lead management.
• To emphasize the necessity of tailored clinical protocols and understanding cardiac anatomy for effective MR imaging.

Main Methods:

• Utilizing electrocardiographic (ECG) gating to synchronize image acquisition with the cardiac cycle, effectively 'stopping' heart motion.
• Meticulous attention to the placement of chest-wall ECG electrodes and the routing of ECG leads.
• Developing and applying specific clinical protocols based on identified clinical questions, including standard and complex cardiac views.

Main Results:

• Optimized ECG electrode placement and lead management significantly enhance the quality of the gating signal.
• Improved gating signal quality directly translates to superior diagnostic-quality cardiac MR images.
• Tailored imaging protocols, incorporating knowledge of cardiac anatomy, allow for the acquisition of relevant morphologic and physiologic data.

Conclusions:

• Electrocardiographic gating is indispensable for achieving diagnostic-quality cardiac MR imaging by mitigating motion artifacts.
• Careful attention to ECG lead placement and protocol design are essential for maximizing the utility of cardiac MR imaging.
• Radiologists can leverage cardiac MR imaging to its full noninvasive diagnostic potential through meticulous planning and execution.