Requirements for Coregistration Accuracy in On-Scalp MEG

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Zetter, Rasmus Iivanainen, Joonas Stenroos, Matti Parkkonen, Lauri 2018-12-10T10:29:29Z 2018-12-10T10:29:29Z 2018-11
dc.identifier.citation Zetter , R , Iivanainen , J , Stenroos , M & Parkkonen , L 2018 , ' Requirements for Coregistration Accuracy in On-Scalp MEG ' Brain Topography , vol. 31 , no. 6 , pp. 931-948 . DOI: 10.1007/s10548-018-0656-5 en
dc.identifier.issn 0896-0267
dc.identifier.issn 1573-6792
dc.identifier.other PURE UUID: c0520a39-ae30-4eab-9cc9-71b6b23478b9
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE LINK:
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dc.description | openaire: EC/H2020/678578/EU//HRMEG
dc.description.abstract Recent advances in magnetic sensing has made on-scalp magnetoencephalography (MEG) possible. In particular, optically-pumped magnetometers (OPMs) have reached sensitivity levels that enable their use in MEG. In contrast to the SQUID sensors used in current MEG systems, OPMs do not require cryogenic cooling and can thus be placed within millimetres from the head, enabling the construction of sensor arrays that conform to the shape of an individual’s head. To properly estimate the location of neural sources within the brain, one must accurately know the position and orientation of sensors in relation to the head. With the adaptable on-scalp MEG sensor arrays, this coregistration becomes more challenging than in current SQUID-based MEG systems that use rigid sensor arrays. Here, we used simulations to quantify how accurately one needs to know the position and orientation of sensors in an on-scalp MEG system. The effects that different types of localisation errors have on forward modelling and source estimates obtained by minimum-norm estimation, dipole fitting, and beamforming are detailed. We found that sensor position errors generally have a larger effect than orientation errors and that these errors affect the localisation accuracy of superficial sources the most. To obtain similar or higher accuracy than with current SQUID-based MEG systems, RMS sensor position and orientation errors should be (Formula presented.) and (Formula presented.), respectively. en
dc.format.extent 18
dc.format.extent 931-948
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation info:eu-repo/grantAgreement/EC/H2020/678578/EU//HRMEG
dc.relation.ispartofseries Brain Topography en
dc.relation.ispartofseries Volume 31, issue 6 en
dc.rights openAccess en
dc.subject.other Anatomy en
dc.subject.other Radiological and Ultrasound Technology en
dc.subject.other Radiology Nuclear Medicine and imaging en
dc.subject.other Neurology en
dc.subject.other Clinical Neurology en
dc.subject.other 3112 Neurosciences en
dc.title Requirements for Coregistration Accuracy in On-Scalp MEG en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Neuroscience and Biomedical Engineering
dc.subject.keyword Coregistration
dc.subject.keyword Magnetoencephalography
dc.subject.keyword Optically-pumped magnetometer
dc.subject.keyword Anatomy
dc.subject.keyword Radiological and Ultrasound Technology
dc.subject.keyword Radiology Nuclear Medicine and imaging
dc.subject.keyword Neurology
dc.subject.keyword Clinical Neurology
dc.subject.keyword 3112 Neurosciences
dc.identifier.urn URN:NBN:fi:aalto-201812106270
dc.identifier.doi 10.1007/s10548-018-0656-5
dc.type.version publishedVersion

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