NDLI: Post mortem conductivity measurement of liver tissue using a contact free magnetic induction sensor

Content Provider	IEEE Xplore Digital Library
Author	Riedel, C.H. Keppelen, M. Nani, S. Dossel, O.
Copyright Year	2003
Description	Author affiliation: Inst. fur Biomedizinische Tech., Karlsruhe Univ., Germany (Riedel, C.H.; Keppelen, M.; Nani, S.; Dossel, O.)
Abstract	The contact free conductivity measurement is a noninvasive method to find electrical characteristics of tissue that can be used e.g. for monitoring. The system consists of an excitation coil and two sensing coils coupled together as a gradiometer. The excitation coil is driven by an alternating current. Due to this alternating magnetic field eddy currents are generated in the tissue that create a secondary magnetic field. Because of the geometrical arrangement, the induced voltage of the secondary field in the upper and the lower coil is different. The presented sensor can be used e.g. for detection of ischemic areas, monitoring wound healing or detection of hematoma beneath the skull. To demonstrate this sensor, two measurements are carried out to detect post mortem changes in a pig liver. The known characteristics from literature can be reproduced using a noncontact method. For this purpose frequencies between 50 kHz and 400 kHz are used. At a frequency of 350 kHz a phase shift of 0.3 degrees is observed post mortem after 2 to 4 hours corresponding to a conductivity change of approximately 0.4 S/m.
Sponsorship	Whitaker Found
Starting Page	3126
Ending Page	3129
File Size	298092
Page Count	4
File Format	PDF
ISBN	0780377893
ISSN	1094687X
DOI	10.1109/IEMBS.2003.1280804
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-09-17
Publisher Place	Mexico
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Conductivity measurement Liver Magnetic sensors Coils Sensor phenomena and characterization Magnetic field measurement Contacts Monitoring Frequency Electric variables
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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