Simultaneous EEG-fMRI: Evaluating the Effect of the EEG Cap-Cabling Configuration on the Gradient Artifact
<p dir="ltr">Electroencephalography (EEG) data recorded during simultaneous EEG-fMRI experiments are contaminated by large gradient artifacts (GA). The amplitude of the GA depends on the area of the wire loops formed by the EEG leads, as well as on the rate of switching of the magnet...
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| مؤلفون آخرون: | , , , |
| منشور في: |
2019
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| _version_ | 1864513520723296256 |
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| author | Muhammad E. H. Chowdhury (14150526) |
| author2 | Amith Khandakar (14151981) Karen J. Mullinger (7247537) Nasser Al-Emadi (16864200) Richard Bowtell (373031) |
| author2_role | author author author author |
| author_facet | Muhammad E. H. Chowdhury (14150526) Amith Khandakar (14151981) Karen J. Mullinger (7247537) Nasser Al-Emadi (16864200) Richard Bowtell (373031) |
| author_role | author |
| dc.creator.none.fl_str_mv | Muhammad E. H. Chowdhury (14150526) Amith Khandakar (14151981) Karen J. Mullinger (7247537) Nasser Al-Emadi (16864200) Richard Bowtell (373031) |
| dc.date.none.fl_str_mv | 2019-07-10T03:00:00Z |
| dc.identifier.none.fl_str_mv | 10.3389/fnins.2019.00690 |
| dc.relation.none.fl_str_mv | https://figshare.com/articles/journal_contribution/Simultaneous_EEG-fMRI_Evaluating_the_Effect_of_the_EEG_Cap-Cabling_Configuration_on_the_Gradient_Artifact/25390954 |
| dc.rights.none.fl_str_mv | CC BY 4.0 info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Biomedical and clinical sciences Neurosciences EEG artifact correction EEG cap-cabling configuration gradient artifact ribbon cable simultaneous EEG-fMRI |
| dc.title.none.fl_str_mv | Simultaneous EEG-fMRI: Evaluating the Effect of the EEG Cap-Cabling Configuration on the Gradient Artifact |
| dc.type.none.fl_str_mv | Text Journal contribution info:eu-repo/semantics/publishedVersion text contribution to journal |
| description | <p dir="ltr">Electroencephalography (EEG) data recorded during simultaneous EEG-fMRI experiments are contaminated by large gradient artifacts (GA). The amplitude of the GA depends on the area of the wire loops formed by the EEG leads, as well as on the rate of switching of the magnetic field gradients, which are essential for MR imaging. Average artifact subtraction (AAS), the most commonly used method for GA correction, relies on the EEG amplifier having a large enough dynamic range to characterize the artifact voltages. Low-pass filtering (250 Hz cut-off) is generally used to attenuate the high-frequency voltage fluctuations of the GA, but even with this precaution channel saturation can occur, particularly during acquisition of high spatial resolution MRI data. Previous work has shown that the ribbon cable, used to connect the EEG cap and amplifier, makes a significant contribution to the GA, since the cable geometry produces large effective wire-loop areas. However, by appropriately connecting the wires of the ribbon cable to the EEG cap it should be possible to minimize the overall range and root mean square (RMS) amplitude of the GA by producing partial cancelation of the cap and cable contributions. Here by modifying the connections of the EEG cap to a 1 m ribbon cable we were able to reduce the range of the GA for a high-resolution coronal echo planar Imaging (EPI) acquisition by a factor of ∼ 1.6 and by a factor of ∼ 1.15 for a standard axial EPI acquisition. These changes could potentially be translated into a reduction in the required dynamic range, an increase in the EEG bandwidth or an increase in the achievable image resolution without saturation, all of which could be beneficially exploited in EEG-fMRI studies. The re-wiring could also prevent the system from saturating when small subject movements occur using the standard recording bandwidth.</p><h2>Other Information</h2><p dir="ltr">Published in: Frontiers in Neuroscience<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.3389/fnins.2019.00690" target="_blank">https://dx.doi.org/10.3389/fnins.2019.00690</a></p> |
| eu_rights_str_mv | openAccess |
| id | Manara2_a1d15fc5555d18835588ebc0683ba4be |
| identifier_str_mv | 10.3389/fnins.2019.00690 |
| network_acronym_str | Manara2 |
| network_name_str | Manara2 |
| oai_identifier_str | oai:figshare.com:article/25390954 |
| publishDate | 2019 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | CC BY 4.0 |
| spelling | Simultaneous EEG-fMRI: Evaluating the Effect of the EEG Cap-Cabling Configuration on the Gradient ArtifactMuhammad E. H. Chowdhury (14150526)Amith Khandakar (14151981)Karen J. Mullinger (7247537)Nasser Al-Emadi (16864200)Richard Bowtell (373031)Biomedical and clinical sciencesNeurosciencesEEG artifact correctionEEG cap-cabling configurationgradient artifactribbon cablesimultaneous EEG-fMRI<p dir="ltr">Electroencephalography (EEG) data recorded during simultaneous EEG-fMRI experiments are contaminated by large gradient artifacts (GA). The amplitude of the GA depends on the area of the wire loops formed by the EEG leads, as well as on the rate of switching of the magnetic field gradients, which are essential for MR imaging. Average artifact subtraction (AAS), the most commonly used method for GA correction, relies on the EEG amplifier having a large enough dynamic range to characterize the artifact voltages. Low-pass filtering (250 Hz cut-off) is generally used to attenuate the high-frequency voltage fluctuations of the GA, but even with this precaution channel saturation can occur, particularly during acquisition of high spatial resolution MRI data. Previous work has shown that the ribbon cable, used to connect the EEG cap and amplifier, makes a significant contribution to the GA, since the cable geometry produces large effective wire-loop areas. However, by appropriately connecting the wires of the ribbon cable to the EEG cap it should be possible to minimize the overall range and root mean square (RMS) amplitude of the GA by producing partial cancelation of the cap and cable contributions. Here by modifying the connections of the EEG cap to a 1 m ribbon cable we were able to reduce the range of the GA for a high-resolution coronal echo planar Imaging (EPI) acquisition by a factor of ∼ 1.6 and by a factor of ∼ 1.15 for a standard axial EPI acquisition. These changes could potentially be translated into a reduction in the required dynamic range, an increase in the EEG bandwidth or an increase in the achievable image resolution without saturation, all of which could be beneficially exploited in EEG-fMRI studies. The re-wiring could also prevent the system from saturating when small subject movements occur using the standard recording bandwidth.</p><h2>Other Information</h2><p dir="ltr">Published in: Frontiers in Neuroscience<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.3389/fnins.2019.00690" target="_blank">https://dx.doi.org/10.3389/fnins.2019.00690</a></p>2019-07-10T03:00:00ZTextJournal contributioninfo:eu-repo/semantics/publishedVersiontextcontribution to journal10.3389/fnins.2019.00690https://figshare.com/articles/journal_contribution/Simultaneous_EEG-fMRI_Evaluating_the_Effect_of_the_EEG_Cap-Cabling_Configuration_on_the_Gradient_Artifact/25390954CC BY 4.0info:eu-repo/semantics/openAccessoai:figshare.com:article/253909542019-07-10T03:00:00Z |
| spellingShingle | Simultaneous EEG-fMRI: Evaluating the Effect of the EEG Cap-Cabling Configuration on the Gradient Artifact Muhammad E. H. Chowdhury (14150526) Biomedical and clinical sciences Neurosciences EEG artifact correction EEG cap-cabling configuration gradient artifact ribbon cable simultaneous EEG-fMRI |
| status_str | publishedVersion |
| title | Simultaneous EEG-fMRI: Evaluating the Effect of the EEG Cap-Cabling Configuration on the Gradient Artifact |
| title_full | Simultaneous EEG-fMRI: Evaluating the Effect of the EEG Cap-Cabling Configuration on the Gradient Artifact |
| title_fullStr | Simultaneous EEG-fMRI: Evaluating the Effect of the EEG Cap-Cabling Configuration on the Gradient Artifact |
| title_full_unstemmed | Simultaneous EEG-fMRI: Evaluating the Effect of the EEG Cap-Cabling Configuration on the Gradient Artifact |
| title_short | Simultaneous EEG-fMRI: Evaluating the Effect of the EEG Cap-Cabling Configuration on the Gradient Artifact |
| title_sort | Simultaneous EEG-fMRI: Evaluating the Effect of the EEG Cap-Cabling Configuration on the Gradient Artifact |
| topic | Biomedical and clinical sciences Neurosciences EEG artifact correction EEG cap-cabling configuration gradient artifact ribbon cable simultaneous EEG-fMRI |