Efficient native MRA at 0.55T using motion-correction

Motivation: MRI at 0.55T with an 80cm bore has allowed improved access to CMR for patients. The application of robust native whole-thorax MRA at low-field remains limited especially due to the challenge of respiratory motion. Goal(s): To develop a large field-of-view, whole-thorax, self-gated and breathing-motion corrected native MRA with a predictable scan time and efficient data usage at 0.55T. Approach: An optimized sampling pattern is used with T2-prep, dual-echo Dixon and non-rigid motion correction is developed. Results: The approach was successfully applied in-vivo and shows successful mitigation of motion artefacts and blurring and good separation of water and fat in the entire thoracic region. Impact: Proof of the viability of self-gated MOCO MRA at 0.55T.