Keyhole-3D phase contrast magnetic resonance angiography: A time-resolved reconstruction method

In this study, we studied the keyhole imaging technique to 3D Phase-contrast magnetic resonance angiography PC MRA to improve its temporal resolution. Previously, our research group has already studied the 2D PC MRA combined with keyhole technique, and evaluated the applicability. For keyhole-3D PC MRA, the keyhole factor was used from 12.5% to 50% of the full k-space. With keyhole factors above 50%, the images were similar to the original image and the vessels in the brain were well observed. We believe the keyhole-3D PC MRA will give some advantages for improving the temporal resolution of MR systems.