An Eddy Current System for the Study of the Cranial Rhythmic Impulse

Author

Stubbe, L. ; Yann Le Bihan ; Ozout, A.-E. ; Herivan, G. ; Berthelot, E.

Author_Institution

ESO Paris Rech., Ecole Super. d´Osteopathie-Paris, Champs-sur-Marne, France

Volume

51

Issue

1

fYear

2015

fDate

Jan. 2015

Firstpage

1

Lastpage

3

Abstract

The cranial rhythmic impulse (CRI) is an important osteopathic medicine concept that refers to the health of the individual. The technique of the eddy current (EC) sensors has the advantage to be directly sensitive to the CRI. In this paper, we present an EC system dedicated to the measurement of the CRI. To detect the CRI, a flexible aluminum foil covered with an adhesive layer is placed on the crane of the patient. The oscillations of the aluminum sheet induced by the CRI are detected by a dedicated EC sensor constituted of a printed coil. The sensing coil is put with an identical reference coil in an ac bridge. The bridge output voltage is analyzed with a lock-in amplifier. A spectral analysis is done on the output signal obtained after a 2 min long record on a patient. Different signals can be observed: 1) cardiac signal; 2) respiration signal; and 3) baroreflexe signal, showing the capability of the EC system in the analysis of the CRI.

Keywords

adhesives; aluminium; amplifiers; bioelectric potentials; biomedical equipment; biomedical measurement; cardiology; coils; eddy currents; foils; neurophysiology; oscillations; pneumodynamics; spectral analysis; Al; CRI analysis; CRI detection; CRI measurement; CRI sensitivity; EC system capability; ac bridge; adhesive layer; aluminum sheet oscillation detection; baroreflex signal; bridge output voltage analysis; cardiac signal; cranial rhythmic impulse; dedicated EC sensor; eddy current sensor; eddy current system; flexible aluminum foil covering; health; lock-in amplifier; osteopathic medicine concept; printed coil; reference coil; respiration signal; sensing coil; spectral analysis; time 2 min; Aluminum; Coils; Cranes; Cranial; Doppler effect; Eddy currents; Sensors; Biomedical; coils; cranial rhythmic impulse (CRI); eddy currents (ECs); magnetic sensors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2360875

Filename

7029228