Inductively coupled wideband transceiver for bioimpedance spectroscopy (IBIS)

H. Hutten*, H. Scharfetter, Wolfgang Ninaus, Bernhard Puswald, Galidia I. Petrova, Dimiter Kovachev

*Corresponding author for this work

Research output: Contribution to journalConference article

Abstract

Most measurement devices for bioimpedance spectroscopy are coupled to the measured object (tissue) via electrodes. At frequencies >500kHz they suffer from artifacts due to stray capacitances between electrode leads as well as between ground and object. The non-invasive measurement of the brain conductivity is hardly possible with surface electrodes. These disadvantages can be obviated by inductive coupling. Aim of this work was the development of a wideband transceiver. In order to define its specifications a feasibility study has been carried out with a simulation model for two different coil systems above a homogeneous conducting plate. According to simulation results both systems render possible to resolve conductivity changes down to 10-3 (Ωm)-1 at 50 kHz. The sensitivity increases with the square of the frequency. The receiver electronics must then resolve voltages > = 1 μV at an excitation current of 1 A. We have realized a transceiver which matches these specifications with a S/N-ratio of 22 dB at 1 μV. The frequency range is 50 kHz-5 MHz.

Original languageEnglish
Pages (from-to)1791-1794
Number of pages4
JournalAnnual International Conference of the IEEE Engineering in Medicine and Biology Society - Proceedings
Volume4
Publication statusPublished - 1 Dec 1998
EventProceedings of the 1998 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Part 4 (of 6) - Hong Kong, China
Duration: 29 Oct 19981 Nov 1998

ASJC Scopus subject areas

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

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