Which type of gating allows for heart-rate variability compensation during imaging?

Retrospective ECG Gating is indeed the correct choice when discussing heart-rate variability compensation during imaging. This technique is significant because it allows for data to be collected continuously throughout the cardiac cycle, regardless of variations in heart rate. The scanner can then sort the acquired data post-examination in relation to specific phases of the heartbeat. This capability to analyze and select the most appropriate slices or data frames correlates directly with various heartbeats enables clinicians to capture a more accurate representation of cardiac anatomy and function, especially in patients whose heart rates fluctuate during the scan.

In contrast, Prospective ECG Gating is more selective, triggering the scanning process at predetermined time intervals based on the ECG signal, which can pose challenges if the patient's heart rate changes. Continuous ECG Monitoring refers to keeping an ongoing check of the heart's electrical activity without directly correlating it with the imaging sequence, making it less suitable for addressing heart-rate variability in the context of imaging. Single-Phase Gating analyzes the heart in strictly one phase of the cardiac cycle, lacking the adaptability needed to accommodate fluctuations in heart rate.