Retrospective Motion Correction at Ultra-High Field using SAMER and Reflected Power

Motivation: Ultra-high field imaging reveals small details not visible at lower fields, but higher resolution increases motion sensitivity. Goal(s): To minimize motion artifacts in ultra-high field acquisitions by retrospectively correcting k-space data and testing if local transmit coils' reflected transmit power can further improve motion correction. Approach: For the first time, a Scout Accelerated Motion Estimation and Reduction (SAMER) reconstruction was used at 7T. In addition, the method was extended by using reflected transmit power, improving the temporal resolution of the estimated motion parameters. Results: SAMER significantly reduced motion artifacts compared to conventional reconstruction, using reflected power further enhanced image quality in some cases. Impact: Retrospectively reducing motion artifacts in ultra-high field scans enhances diagnostic usefulness, especially for high-resolution acquisitions to detect small focal pathology, a typical clinical use case of ultra-high field scanners.