Instrumentation for the non-invasive direct measurement of skull impedance

Author

Seagar, Andrew ; Chen, Dong

Author_Institution

Sch. of Biophys. Sci. & Electr. Eng., Swinburne Univ. of Technol., Hawthorn, Australia

fYear

1998

fDate

15-18 Feb 1998

Firstpage

103

Lastpage

104

Abstract

A model is presented for the local flow of electric current, based on the known electrical properties of the tissues which comprise the human head. It is applied to the design of an instrument for the direct non-invasive measurement of the skull´s impedance, addressing the need for exceedingly high impedances at frequencies in the 10 to 100 kHz range. It is shown how the design achieves impedances in excess of those of the usually achieved with operational amplifiers, even when their open loop gains are strictly limited. The performance characteristics of a hardware realisation of the design are presented

Keywords

bioelectric phenomena; biomedical equipment; bone; electric impedance measurement; physiological models; 10 to 100 kHz; electric current local flow model; hardware realisation; human head; medical instrumentation; noninvasive direct measurement instrumentation; open loop gains; operational amplifiers; performance characteristics; skull impedance; tissue electrical properties; Current measurement; Electric resistance; Electric variables measurement; Electrical resistance measurement; Frequency; Immune system; Impedance measurement; Instruments; Scalp; Skull;

fLanguage

English

Publisher

ieee

Conference_Titel

Bioelectromagnetism, 1998. Proceedings of the 2nd International Conference on

Conference_Location

Melbourne, Vic.

Print_ISBN

0-7803-3867-7

Type

conf

DOI

10.1109/ICBEM.1998.666416

Filename

666416