Abstract
Background Cardiac and respiratory motion artifacts are major challenges to whole-heart coronary MRA. The conventional motion suppression strategies often involve prospective gating based on motion surrogates, e.g. ECG and navigator, which complicates scan setup and prolongs scan time significantly. To address these limitations, an ECG and navigator-free 4D whole-heart coronary MRA technique was recently proposed, providing both cardiac function and coronary artery assessment from a single measurement [1]. In this work, we evaluate the 4D technique by comparing it against conventional cine and coronary MRA protocols.
Highlights
Cardiac and respiratory motion artifacts are major challenges to whole-heart coronary MRA
A Gd-BOPTA enhanced, ungated spoiled GRE sequence with 3DPR trajectory was used at 3T achieving wholeheart coverage, (1.0 mm)3 resolution, and fixed 10-min scan time
Data were binned into respective cardiac and respiratory phases based on motion information extracted from self-gating projections using principal component analysis, and respiratory motion was corrected using an image-based approach [2]
Summary
Cardiac and respiratory motion artifacts are major challenges to whole-heart coronary MRA. The conventional motion suppression strategies often involve prospective gating based on motion surrogates, e.g. ECG and navigator, which complicates scan setup and prolongs scan time significantly. To address these limitations, an ECG and navigator-free 4D whole-heart coronary MRA technique was recently proposed, providing both cardiac function and coronary artery assessment from a single measurement [1]. We evaluate the 4D technique by comparing it against conventional cine and coronary MRA protocols
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