Analysis of resting noise characteristics of three EIT systems in order to compare suitability for time difference imaging with scalp electrodes during epileptic seizures
Electrical impedance tomography measurements in clinical applications are limited by an undesired noise component. We have investigated the noise in three systems suitable for imaging epileptic seizures, the UCH Mark1b, UCH Mark2.5 and KHU Mark1 16 channel, at applied frequencies in three steps from...
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| Veröffentlicht in: | Physiological measurement 2007-07, Vol.28 (7), p.S217-S236 |
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| creator | Fabrizi, L McEwan, A Woo, E Holder, D S |
| description | Electrical impedance tomography measurements in clinical applications are limited by an undesired noise component. We have investigated the noise in three systems suitable for imaging epileptic seizures, the UCH Mark1b, UCH Mark2.5 and KHU Mark1 16 channel, at applied frequencies in three steps from 1 to 100 kHz, by varying load impedance, single terminal or multiplexed measurements, and in test objects of increasing complexity from a resistor to a saline filled tank and human volunteer. The noise was white, and increased from about 0.03% rms on the resistor to 0.08% on the human; it increased with load but was independent of use of the multiplexer. The KHU Mark1 delivered the best performance with noise spectra of about 0.02%, which could be further reduced by averaging to a level where reliable imaging of changes of about 0.1% estimated during epileptic seizures appears plausible. |
| doi_str_mv | 10.1088/0967-3334/28/7/S16 |
| format | Article |
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The KHU Mark1 delivered the best performance with noise spectra of about 0.02%, which could be further reduced by averaging to a level where reliable imaging of changes of about 0.1% estimated during epileptic seizures appears plausible.</description><subject>Electric Impedance</subject><subject>Electrodes</subject><subject>Epilepsy - diagnosis</subject><subject>Humans</subject><subject>Models, Neurological</subject><subject>Phantoms, Imaging</subject><subject>Scalp</subject><subject>Sodium Chloride</subject><subject>Tomography - instrumentation</subject><subject>Tomography - methods</subject><issn>0967-3334</issn><issn>1361-6579</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkcFu3CAURVHVqpkm-YEuKlaVsnAHsA14GUVpGilSFknXCPAjQ2UbF7Cq6Sf1K4s7o3QRqd2AxD3vXvQuQu8p-USJlFvScVHVdd1smdyK7QPlr9CG1pxWvBXda7R5Bk7Qu5S-EUKpZO1bdEIF5w2vxQb9upz0sE8-4eBwhJT99ISn4BNgu9NR2wzRl1f7B8i7CICvbx9x2qcMY8J-wiH2EHEO2IZx1hFwWnzWxg8-77ELRfIj4N47BxEmC9iP-mmN-eHzDierhxnDADbH0EPC_RJXEWY_wFyCcQL_cylfO0NvnB4SnB_vU_T18_Xj1Zfq7v7m9uryrrINaXI5rTPSMNHbrjVAemgazeu2sdBKK7TkhWPatZrZohnTSaaZ067XxphG1qfo48F3juH7UlaiRp8sDIOeICxJcUkpoYL9F6SdaDhpV5AdQBtDShGcmmNZQtwrStRapVqbUmtTikklVKmyDH04ui9mhP7vyLG7AlwcAB_mZ_WlkZp7V9jqJfuP8N-fhLqp</recordid><startdate>20070701</startdate><enddate>20070701</enddate><creator>Fabrizi, L</creator><creator>McEwan, A</creator><creator>Woo, E</creator><creator>Holder, D S</creator><general>IOP Publishing</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QO</scope><scope>7TK</scope><scope>8FD</scope><scope>FR3</scope><scope>P64</scope><scope>7X8</scope></search><sort><creationdate>20070701</creationdate><title>Analysis of resting noise characteristics of three EIT systems in order to compare suitability for time difference imaging with scalp electrodes during epileptic seizures</title><author>Fabrizi, L ; McEwan, A ; Woo, E ; Holder, D S</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c404t-c4cfb8b27dc95be0de44a6354ce58c7a86c402af5a2cde4bb982a2fafdabbb483</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>Electric Impedance</topic><topic>Electrodes</topic><topic>Epilepsy - diagnosis</topic><topic>Humans</topic><topic>Models, Neurological</topic><topic>Phantoms, Imaging</topic><topic>Scalp</topic><topic>Sodium Chloride</topic><topic>Tomography - instrumentation</topic><topic>Tomography - methods</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Fabrizi, L</creatorcontrib><creatorcontrib>McEwan, A</creatorcontrib><creatorcontrib>Woo, E</creatorcontrib><creatorcontrib>Holder, D S</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Biotechnology Research Abstracts</collection><collection>Neurosciences Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>Physiological measurement</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Fabrizi, L</au><au>McEwan, A</au><au>Woo, E</au><au>Holder, D S</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Analysis of resting noise characteristics of three EIT systems in order to compare suitability for time difference imaging with scalp electrodes during epileptic seizures</atitle><jtitle>Physiological measurement</jtitle><addtitle>Physiol Meas</addtitle><date>2007-07-01</date><risdate>2007</risdate><volume>28</volume><issue>7</issue><spage>S217</spage><epage>S236</epage><pages>S217-S236</pages><issn>0967-3334</issn><eissn>1361-6579</eissn><abstract>Electrical impedance tomography measurements in clinical applications are limited by an undesired noise component. 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| fulltext | fulltext |
| identifier | ISSN: 0967-3334 |
| ispartof | Physiological measurement, 2007-07, Vol.28 (7), p.S217-S236 |
| issn | 0967-3334 1361-6579 |
| language | eng |
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| source | MEDLINE; Institute of Physics Journals |
| subjects | Electric Impedance Electrodes Epilepsy - diagnosis Humans Models, Neurological Phantoms, Imaging Scalp Sodium Chloride Tomography - instrumentation Tomography - methods |
| title | Analysis of resting noise characteristics of three EIT systems in order to compare suitability for time difference imaging with scalp electrodes during epileptic seizures |
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