Scientific Abstracts - Pediatric and Congenital Heart Disease Scientific Presentations-Cardiac Self-Gating for Free-Breathing Phase-Contrast MRI

Cardiac Self-Gating for Free-Breathing Phase-Contrast MRI

Video Transcription

Video Summary

Marcus presents a self-gating method for cardiac MRI that removes the need for ECG leads while maintaining clinical image quality. The sequence samples k-space center data each TR, then a reconstruction algorithm separates magnitude and phase, reduces respiratory noise, and uses iterative singular spectrum analysis to isolate cardiac motion. Peaks in the resulting signal define R-R intervals for reconstruction. In patient studies, self-gating matched ECG closely, with about 3 ms mean difference and less than 4% deviation in flow measurements. The method may enable cardiac MRI in cases where ECG is difficult, such as fetal or high-field imaging.

Keywords

cardiac MRI

self-gating

ECG-free imaging

singular spectrum analysis

R-R intervals