NDLI: A torso phantom for the assessment of active and passive vortex currents

Content Provider	IEEE Xplore Digital Library
Author	Haueisen, J. Liehr, M. Dutz, S. Leder, U. Nenonen, J. Bellemann, M.E.
Copyright Year	2003
Description	Author affiliation: Dept. of Neurology, Friedrich-Schiller-Univ., Jena, Germany (Haueisen, J.; Liehr, M.; Dutz, S.)
Abstract	We developed a realistically shaped physical torso phantom for the assessment of the influence of active and passive vortex currents on the magnetocardiogram (MCG) and the electrocardiogram (ECG). Active vortex currents were produced by twelve circularly arranged single dipoles. Passive vortex currents were created with the help of a single dipole inside a hollow cylinder. The conductivity of this hollow cylinder compartment was varied systematically, while the torso compartment conductivity was kept constant. We measured simultaneously magnetic and electric signals. Source localization was performed with the help of boundary element models. For the passive vortex currents we found that an increased conductivity ratio (hollow cylinder to torso) caused a slight increase of the magnetic signal strength and a strong decrease of the electric signal strength. For the active vortex currents we found that the more vortex shaped these currents were the more the electric signal strength decreased. In this case, the magnetic signal strength was not influenced. Source localization for the active vortex current model was found to be more accurate when using magnetometer signals as compared to gradiometer signals or electrode signals. For the passive vortex current model we found dipole localization errors of up to 16mm when using a homogeneous torso model. In conclusion, vortex currents might explain the experimentally observed differences between MCG and ECG recordings.
Sponsorship	Whitaker Found
Starting Page	66
Ending Page	69
File Size	430618
Page Count	4
File Format	PDF
ISBN	0780377893
ISSN	1094687X
DOI	10.1109/IEMBS.2003.1279510
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	Torso Imaging phantoms Conductivity Electrocardiography Magnetometers Engine cylinders Biomedical engineering Electric variables measurement Electrodes Magnetic recording
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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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