Reducing motion artefact in high resolution 7T scans using a new head stabilisation device

Motivation: Long scan durations and ultra-high field both facilitate the acquisition of high-resolution quantitative brain MRI, but they increase motion sensitivity. Goal(s): We aimed to limit the occurrence of deliberate motion by testing a device (‘MinMo’) designed to increase head stability at 7T. Approach: Using two k-space phase encoding orders with different motion sensitivity profiles we obtained data with and without the MinMo device. Results: This showed that the MinMo increased image quality visually and as measured quantitatively via reduced gradient entropy in scans of ~10 and ~20 minute duration. Impact: Reducing head motion would have a significant impact on image quality in high-resolution long duration research scans and clinical imaging. A preliminary investigation of a prototype device aiming to stabilize the head showed efficacy in most subjects, warranting further investigation.