Cardiac motion can be significantly reduced by which of the following techniques?

• A. High-bandwidth imaging
• B. Fat suppression
• C. EKG or peripheral gating
• D. Gradient echo imaging

Answer: (C)

Cardiac motion can be significantly reduced using EKG or peripheral gating techniques. This method involves synchronizing the MRI data acquisition with the cardiac cycle. By utilizing the electrical signals generated by the heart during each heartbeat, imaging can be timed to occur at specific points in the cardiac cycle, such as diastole or systole. This synchronization helps to minimize motion artifacts caused by the heart's movement, resulting in clearer and more accurate images of cardiac structures and function.

High-bandwidth imaging, while it can improve resolution and reduce some types of artifacts, does not directly address the issue of cardiac motion and would not be as effective in mitigating the blurring that occurs during imaging of a moving structure like the heart. Fat suppression techniques are primarily used to reduce the signal from fat, improving the visibility of adjacent structures but are not specifically aimed at counteracting motion caused by cardiac activity. Gradient echo imaging, while it has its advantages in certain applications, typically does not provide the same level of motion reduction as gating methods do, and may be more susceptible to motion artifacts if not carefully managed. Thus, EKG or peripheral gating stands out as the most effective technique for reducing cardiac motion in MRI.