Event Abstract Back to Event Individual head-casts for MEG David Bradbury1*, Paul Hammond1 and Gareth Barnes1 1 UCL, United Kingdom The objective of this work is accurate, repeatable head positioning and co-registration for MEG. Methods:By placing the subjectâs head in a helmet-shaped duplicate of the measurement dewar and filling the surrounding space with silicon composite we were able to make subject-specific head casts. These head-casts were moulded to the subjects head internally yet externally located precisely into the measurement dewar. To test the relocation accuracy we used a median nerve electrical stimulation paradigm (motor-twitch threshold, 4Hz, 500 trials) lasting for approximately 2 minutes per-recording run. After each run the subject was removed from the dewar and given a two minute break to allow free movement of the head. This was repeated nine times, without removing the head-cast from the subject. Initial results (based on nasion coil location) suggest that the head could be located to within an error of rms error 1.7mm. Within-run head movement was consistently less than 1mm. We are currently testing different head-cast materials and the incorporation of fiducial markers within the cast for MRI visibility. Conclusions:The MEG head cast means that high SNR can be achieved through multiple independent recording sessions. Ultimately the use of individual MEG head casts promises reduced subject movement, precise subject relocation and high co-registration accuracy. Conference: Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010. Presentation Type: Poster Presentation Topic: Instrumentation and Multi-modal Integrations: MEG, Low-field MRI,EEG, fMRI,TMS,NIRS Citation: Bradbury D, Hammond P and Barnes G (2010). Individual head-casts for MEG. Front. Neurosci. Conference Abstract: Biomag 2010 - 17th International Conference on Biomagnetism . doi: 10.3389/conf.fnins.2010.06.00031 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 19 Mar 2010; Published Online: 19 Mar 2010. * Correspondence: David Bradbury, UCL, London, United Kingdom, d.bradbury@fil.ion.ucl.ac.uk Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers David Bradbury Paul Hammond Gareth Barnes Google David Bradbury Paul Hammond Gareth Barnes Google Scholar David Bradbury Paul Hammond Gareth Barnes PubMed David Bradbury Paul Hammond Gareth Barnes Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.