5D whole-heart sparse MRI

作者：Feng Li^*; Coppo Simone; Piccini Davide; Yerly Jerome; Lim Ruth P; Masci Pier Giorgio; Stuber Matthias; Sodickson Daniel K; Otazo Ricardo

来源：Magnetic Resonance in Medicine, 2018, 79(2): 826-838.

DOI：10.1002/mrm.26745

• whole-heart MRI
• compressed sensing
• 3D radial sampling
• golden-angle
• coronary MRA
• respiratory motion

PurposeA 5D whole-heart sparse imaging framework is proposed for simultaneous assessment of myocardial function and high-resolution cardiac and respiratory motion-resolved whole-heart anatomy in a single continuous noncontrast MR scan.
MethodsA non-electrocardiograph (ECG)-triggered 3D golden-angle radial balanced steady-state free precession sequence was used for data acquisition. The acquired 3D k-space data were sorted into a 5D dataset containing separated cardiac and respiratory dimensions using a self-extracted respiratory motion signal and a recorded ECG signal. Images were then reconstructed using XD-GRASP, a multidimensional compressed sensing technique exploiting correlations/sparsity along cardiac and respiratory dimensions. 5D whole-heart imaging was compared with respiratory motion-corrected 3D and 4D whole-heart imaging in nine volunteers for evaluation of the myocardium, great vessels, and coronary arteries. It was also compared with breath-held, ECG-gated 2D cardiac cine imaging for validation of cardiac function quantification.
Results5D whole-heart images received systematic higher quality scores in the myocardium, great vessels and coronary arteries. Quantitative coronary sharpness and length were always better for the 5D images. Good agreement was obtained for quantification of cardiac function compared with 2D cine imaging.
Conclusion5D whole-heart sparse imaging represents a robust and promising framework for simplified comprehensive cardiac MRI without the need for breath-hold and motion correction. Magn Reson Med 79:826-838, 2018.

• 出版日期2018-2