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In vivo detection of normal and pathologic bowel electrical activity using a SQUID magnetometer

The Superconducting QUantum Interference Device (SQUID) magnetometer can non-invasively detect the magnetic fields created by the Basic Electrical Rhythm (BER) of the Gastrointestinal Tract (GIT). Using anesthetized adult male New Zealand rabbits the authors recorded signals from two isolated bowel...

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Main Authors:	Ladipo, J.K., Bradshaw, L.A., Hegde, S.S., Wikswo, J.P., Richards, W.O.
Format:	Conference Proceeding
Language:	English
Subjects:	Bit error rate Frequency Gastrointestinal tract In vivo Interference Magnetic fields Rabbits Rhythm SQUID magnetometers Superconducting devices
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container_end_page	2389 vol.6
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creator	Ladipo, J.K. Bradshaw, L.A. Hegde, S.S. Wikswo, J.P. Richards, W.O.
description	The Superconducting QUantum Interference Device (SQUID) magnetometer can non-invasively detect the magnetic fields created by the Basic Electrical Rhythm (BER) of the Gastrointestinal Tract (GIT). Using anesthetized adult male New Zealand rabbits the authors recorded signals from two isolated bowel segments at the same time, before and after ischemia was induced in either one or both bowel segments. The dominant frequency peaks for each period of recording were determined using autoregressive (AR) spectral analysis. There was a significant fall in the BER frequency in the ischemic segment from 11.8/spl plusmn/0.9 to 7.8/spl plusmn/0.6 cycles per minute (cpm), while there was no change in the normal bowel. It was possible for two observers (LAB, WOR) who were blinded to the preparation, to identify which bowel segment was ischemic. The results of this experiment demonstrate the ability of the SQUID magnetometer to noninvasively detect and differentiate signals from normal and ischemic bowel sources.
doi_str_mv	10.1109/IEMBS.1997.756799
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The results of this experiment demonstrate the ability of the SQUID magnetometer to noninvasively detect and differentiate signals from normal and ischemic bowel sources.</description><subject>Bit error rate</subject><subject>Frequency</subject><subject>Gastrointestinal tract</subject><subject>In vivo</subject><subject>Interference</subject><subject>Magnetic fields</subject><subject>Rabbits</subject><subject>Rhythm</subject><subject>SQUID magnetometers</subject><subject>Superconducting devices</subject><issn>1094-687X</issn><issn>1558-4615</issn><isbn>9780780342620</isbn><isbn>0780342623</isbn><fulltext>true</fulltext><rsrctype>conference_proceeding</rsrctype><creationdate>1997</creationdate><recordtype>conference_proceeding</recordtype><sourceid>6IE</sourceid><recordid>eNp9j81OwzAQhC1-JFroA8BpXyDpOo3j-Aq0IgcOqCBxi0y6DUaOXTkmqG-PEZyRRprDNzPSMHbNMecc1bJZP95uc66UzKWopFInbMaFqLOy4uKULZSsMWlVFlWBZ4mhKrOqlq8XbD6OH4gFouAz1jYOJjN52FGkLhrvwO_B-TBoC9rt4KDju7e-Nx28-S-yQDblgul-eCpMJh7hczSuBw3bp5fmHgbdO4p-SIvhip3vtR1p8eeX7Gazfr57yAwRtYdgBh2O7e-F1b_wG2nmR_c</recordid><startdate>1997</startdate><enddate>1997</enddate><creator>Ladipo, J.K.</creator><creator>Bradshaw, L.A.</creator><creator>Hegde, S.S.</creator><creator>Wikswo, J.P.</creator><creator>Richards, W.O.</creator><general>IEEE</general><scope>6IE</scope><scope>6IH</scope><scope>CBEJK</scope><scope>RIE</scope><scope>RIO</scope></search><sort><creationdate>1997</creationdate><title>In vivo detection of normal and pathologic bowel electrical activity using a SQUID magnetometer</title><author>Ladipo, J.K. ; Bradshaw, L.A. ; Hegde, S.S. ; Wikswo, J.P. ; Richards, W.O.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-ieee_primary_7567993</frbrgroupid><rsrctype>conference_proceedings</rsrctype><prefilter>conference_proceedings</prefilter><language>eng</language><creationdate>1997</creationdate><topic>Bit error rate</topic><topic>Frequency</topic><topic>Gastrointestinal tract</topic><topic>In vivo</topic><topic>Interference</topic><topic>Magnetic fields</topic><topic>Rabbits</topic><topic>Rhythm</topic><topic>SQUID magnetometers</topic><topic>Superconducting devices</topic><toplevel>online_resources</toplevel><creatorcontrib>Ladipo, J.K.</creatorcontrib><creatorcontrib>Bradshaw, L.A.</creatorcontrib><creatorcontrib>Hegde, S.S.</creatorcontrib><creatorcontrib>Wikswo, J.P.</creatorcontrib><creatorcontrib>Richards, W.O.</creatorcontrib><collection>IEEE Electronic Library (IEL) Conference Proceedings</collection><collection>IEEE Proceedings Order Plan (POP) 1998-present by volume</collection><collection>IEEE Xplore All Conference Proceedings</collection><collection>IEEE Xplore</collection><collection>IEEE Proceedings Order Plans (POP) 1998-present</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Ladipo, J.K.</au><au>Bradshaw, L.A.</au><au>Hegde, S.S.</au><au>Wikswo, J.P.</au><au>Richards, W.O.</au><format>book</format><genre>proceeding</genre><ristype>CONF</ristype><atitle>In vivo detection of normal and pathologic bowel electrical activity using a SQUID magnetometer</atitle><btitle>Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)</btitle><stitle>IEMBS</stitle><date>1997</date><risdate>1997</risdate><volume>6</volume><spage>2388</spage><epage>2389 vol.6</epage><pages>2388-2389 vol.6</pages><issn>1094-687X</issn><eissn>1558-4615</eissn><isbn>9780780342620</isbn><isbn>0780342623</isbn><abstract>The Superconducting QUantum Interference Device (SQUID) magnetometer can non-invasively detect the magnetic fields created by the Basic Electrical Rhythm (BER) of the Gastrointestinal Tract (GIT). Using anesthetized adult male New Zealand rabbits the authors recorded signals from two isolated bowel segments at the same time, before and after ischemia was induced in either one or both bowel segments. The dominant frequency peaks for each period of recording were determined using autoregressive (AR) spectral analysis. There was a significant fall in the BER frequency in the ischemic segment from 11.8/spl plusmn/0.9 to 7.8/spl plusmn/0.6 cycles per minute (cpm), while there was no change in the normal bowel. It was possible for two observers (LAB, WOR) who were blinded to the preparation, to identify which bowel segment was ischemic. The results of this experiment demonstrate the ability of the SQUID magnetometer to noninvasively detect and differentiate signals from normal and ischemic bowel sources.</abstract><pub>IEEE</pub><doi>10.1109/IEMBS.1997.756799</doi></addata></record>
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identifier	ISSN: 1094-687X
ispartof	Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136), 1997, Vol.6, p.2388-2389 vol.6
issn	1094-687X 1558-4615
language	eng
recordid	cdi_ieee_primary_756799
source	IEEE Electronic Library (IEL) Conference Proceedings
subjects	Bit error rate Frequency Gastrointestinal tract In vivo Interference Magnetic fields Rabbits Rhythm SQUID magnetometers Superconducting devices
title	In vivo detection of normal and pathologic bowel electrical activity using a SQUID magnetometer
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