2022/09 - Free-running cardiac and respiratory motion-resolved 5D whole-heart coronary cardiovascular magnetic resonance angiography in pediatric cardiac patients using ferumoxytol [Journal Club]-2022

Video Transcription

Video Summary

The JCMR Journal Club opened with announcements about CME credit, chat participation, and upcoming journal club sessions. Dr. Scott Flam introduced a paper by Drs. Christopher Roy and Matthias Stuber on a “free-running” 5D whole-heart cardiac MRI framework applied to pediatric congenital heart disease patients using ferumoxytol.<br /><br />The presentation explained how pediatric CMR is challenging because of small anatomy, fast heart rates, motion, and the need for breath-holding or anesthesia. The proposed approach uses continuous 3D radial imaging without ECG or respiratory gating during acquisition, combined with self-gating signals extracted from the data and compressed-sensing reconstruction afterward. This allows retrospective sorting into cardiac and respiratory phases, producing motion-resolved 3D images.<br /><br />In 18 pediatric patients (free-breathing and intubated/anesthetized), the technique achieved good blood-to-myocardium contrast, clear coronary visualization, and strong respiratory motion resolution. Self-gating often outperformed ECG, which sometimes failed due to poor signal quality. Free-breathing patients generally performed comparably to intubated patients in image quality measures, including coronary sharpness and respiratory interface sharpness.<br /><br />The discussion focused on clinical utility, including coronary origins, coronary veins, pulmonary veins, arrhythmias, respiratory irregularity, and future contrast-free or UTE-based versions to reduce flow artifacts. The authors emphasized that this work is a step toward a “push-button” whole-heart pediatric CMR approach with broader applications in anatomy, function, flow, and tissue characterization.

Keywords

pediatric cardiac MRI

free-running 5D imaging

congenital heart disease

ferumoxytol

self-gating

whole-heart MRI

compressed sensing reconstruction

coronary visualization

respiratory motion resolution

pediatric CMR