Abstract #1406

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

Jyoti Mangal^1,2, Simon Richardson³, Yannick Brackenier^1,2, Fred Dick³, Pierluigi Di Cio^1,2, Martina Callaghan⁴, and David W Carmichael^1,2

¹Biomedical Engineering Department, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom, ²London Collaborative Ultra high field System (LoCUS), London, United Kingdom, ³Experimental Psychology, University College London, London, United Kingdom, ⁴Imaging Neuroscience, University College London, London, United Kingdom

Synopsis

Keywords: High-Field MRI, Motion Correction

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.

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