Fei Han1, Ziwu Zhou1, Paul J Finn1, and Peng Hu1
Cardiac-phase-resolved 4D MR angiography (MRA) is a
promising technique for evaluating patients with cardiovascular disorder.
However, current approaches usually has low scan efficiency (20-40%) due to the
gating based respiratory motion compensation and therefore suffered from
prolonged yet unpredictable scan time. In this work, we proposed a motion
correction strategy in which complex non-rigid respiratory motion is modeled using
voxel-based linear translations, which are estimated using 3D image
registration. Our preliminary result shows that
the proposed technique could compensate for complex motion across the large
field-of-view of 4D MRA and potentially improve the scan efficiency by
including more k-space data in the reconstruction.