Less Can Be More: Reduction of Motion Artifacts by Ignoring Parts of the Acquired Dataset

Tim Nielsen¹, Jinnan Wang^2,3, Peter Boernert¹

High resolution MR imaging of the carotids is an interesting technique for plaque characterization but image quality can be compromised by motion artifacts. Effects of breathing and pulsation can be reduced by gated acquisition. Coping with non-periodic motion (e.g. swallowing) is still often challenging in clinical practice and is considered as a major factor that contributes to the overall 20% failure rate in clinical scans. We present a method to reduce the effects of sudden, non-periodic motion by exploiting data redundancy which is usually present in parallel imaging with multiple receive coils. The method can be applied retrospectively without any navigator information.