NDLI: Biological tissues dispersivity and power loss density in transcranial magnetic stimulation

Content Provider	IEEE Xplore Digital Library
Author	Porzig, K. Brauer, H. Toepfer, H.
Copyright Year	2013
Description	Author affiliation: Dept. of Adv. Electromagn., Ilmenau Univ. of Technol., Ilmenau, Germany (Porzig, K.; Brauer, H.; Toepfer, H.)
Abstract	Power loss density and energy converted into heat considering dispersive biological tissue was investigated in the framework of transcranial magnetic stimulation (TMS). The solutions were obtained by applying an analytic method of Eaton [1] and a finite-element method (FEM). A commercial available figure-of-8 coil with a biphasic current pulse operates as the source of excitation. The calculations were performed in the frequency domain by using 1000 complex harmonics at different frequencies in order to reconstruct the transient signal in the excitation coil. The displacement current density was taken into account to provide an accurate estimate of the total energy. The human head was modeled as a homogeneous isotropic dispersive volume conductor consisting of grey matter (GM). The dielectric properties of GM were calculated in dependence on the frequency by means of the Cole-Cole model from Gabriel et al. [2]. The induced electric field as well as the current density are compared against those obtained in the non-dispersive case. The results revealed an increased magnitude of the peak value of the current density by 22.3% compared to the non-dispersive case. However, the induced electric field was not influenced by tissues dispersivity. Finally it was shown that the frequency dependent biological tissue affects the time development of the power loss density but has only minor effects on the total energy converted into heat.
Starting Page	1
Ending Page	5
File Size	1757703
Page Count	5
File Format	PDF
ISBN	9789532900408
DOI	10.1109/SoftCOM.2013.6671857
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-18
Publisher Place	Croatia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	dispersive material finite-element method transcranial magnetic stimulation
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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