Ultra-Short TR Contrast-Enhanced MR Angiography with Spiral Centric Phase Reordering

Introduction For the contrast enhanced MR angiography (CE MRA) [1] with a 3D Spoiled GRE sequence, the speed is a primary design requirement [2]. One way to improve the speed is to maximize the sequence efficiency (i.e. the ratio between DAQ event and TR) by skipping the phase encoding (PE) rewinders. This, however, introduces the phase coherence artifacts in backgrounds, in particular within the body regions where soft tissues are more prominent. The current study proposes a novel spiral centric phase reordering algorithm that significantly reduces the phase coherence artifacts and allows ultra-short TR CE MRA while skipping PE rewinders.