Evaluation of realistic layouts for next generation on-scalp MEG: spatial information density maps

Abstract While commercial magnetoencephalography (MEG) systems are the functional neuroimaging state-of-the-art in terms of spatio-temporal resolution, MEG sensors have not changed significantly since the 1990s. Interest in newer sensors that operate at less extreme temperatures, e.g., high critical...

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Autores principales:	Bushra Riaz, Christoph Pfeiffer, Justin F. Schneiderman
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/44544225bb47417bac199929253a2164
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spelling	oai:doaj.org-article:44544225bb47417bac199929253a21642021-12-02T16:06:04ZEvaluation of realistic layouts for next generation on-scalp MEG: spatial information density maps10.1038/s41598-017-07046-62045-2322https://doaj.org/article/44544225bb47417bac199929253a21642017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07046-6https://doaj.org/toc/2045-2322Abstract While commercial magnetoencephalography (MEG) systems are the functional neuroimaging state-of-the-art in terms of spatio-temporal resolution, MEG sensors have not changed significantly since the 1990s. Interest in newer sensors that operate at less extreme temperatures, e.g., high critical temperature (high-T c) SQUIDs, optically-pumped magnetometers, etc., is growing because they enable significant reductions in head-to-sensor standoff (on-scalp MEG). Various metrics quantify the advantages of on-scalp MEG, but a single straightforward one is lacking. Previous works have furthermore been limited to arbitrary and/or unrealistic sensor layouts. We introduce spatial information density (SID) maps for quantitative and qualitative evaluations of sensor arrays. SID-maps present the spatial distribution of information a sensor array extracts from a source space while accounting for relevant source and sensor parameters. We use it in a systematic comparison of three practical on-scalp MEG sensor array layouts (based on high-T c SQUIDs) and the standard Elekta Neuromag TRIUX magnetometer array. Results strengthen the case for on-scalp and specifically high-T c SQUID-based MEG while providing a path for the practical design of future MEG systems. SID-maps are furthermore general to arbitrary magnetic sensor technologies and source spaces and can thus be used for design and evaluation of sensor arrays for magnetocardiography, magnetic particle imaging, etc.Bushra RiazChristoph PfeifferJustin F. SchneidermanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Bushra Riaz Christoph Pfeiffer Justin F. Schneiderman Evaluation of realistic layouts for next generation on-scalp MEG: spatial information density maps
description	Abstract While commercial magnetoencephalography (MEG) systems are the functional neuroimaging state-of-the-art in terms of spatio-temporal resolution, MEG sensors have not changed significantly since the 1990s. Interest in newer sensors that operate at less extreme temperatures, e.g., high critical temperature (high-T c) SQUIDs, optically-pumped magnetometers, etc., is growing because they enable significant reductions in head-to-sensor standoff (on-scalp MEG). Various metrics quantify the advantages of on-scalp MEG, but a single straightforward one is lacking. Previous works have furthermore been limited to arbitrary and/or unrealistic sensor layouts. We introduce spatial information density (SID) maps for quantitative and qualitative evaluations of sensor arrays. SID-maps present the spatial distribution of information a sensor array extracts from a source space while accounting for relevant source and sensor parameters. We use it in a systematic comparison of three practical on-scalp MEG sensor array layouts (based on high-T c SQUIDs) and the standard Elekta Neuromag TRIUX magnetometer array. Results strengthen the case for on-scalp and specifically high-T c SQUID-based MEG while providing a path for the practical design of future MEG systems. SID-maps are furthermore general to arbitrary magnetic sensor technologies and source spaces and can thus be used for design and evaluation of sensor arrays for magnetocardiography, magnetic particle imaging, etc.
format	article
author	Bushra Riaz Christoph Pfeiffer Justin F. Schneiderman
author_facet	Bushra Riaz Christoph Pfeiffer Justin F. Schneiderman
author_sort	Bushra Riaz
title	Evaluation of realistic layouts for next generation on-scalp MEG: spatial information density maps
title_short	Evaluation of realistic layouts for next generation on-scalp MEG: spatial information density maps
title_full	Evaluation of realistic layouts for next generation on-scalp MEG: spatial information density maps
title_fullStr	Evaluation of realistic layouts for next generation on-scalp MEG: spatial information density maps
title_full_unstemmed	Evaluation of realistic layouts for next generation on-scalp MEG: spatial information density maps
title_sort	evaluation of realistic layouts for next generation on-scalp meg: spatial information density maps
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/44544225bb47417bac199929253a2164
work_keys_str_mv	AT bushrariaz evaluationofrealisticlayoutsfornextgenerationonscalpmegspatialinformationdensitymaps AT christophpfeiffer evaluationofrealisticlayoutsfornextgenerationonscalpmegspatialinformationdensitymaps AT justinfschneiderman evaluationofrealisticlayoutsfornextgenerationonscalpmegspatialinformationdensitymaps
_version_	1718385083189035008

Evaluation of realistic layouts for next generation on-scalp MEG: spatial information density maps

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