XIX Sympozjum Srodowiskowe PTZE - materialy.pdf
XIX Sympozjum Srodowiskowe PTZE - materialy.pdf XIX Sympozjum Srodowiskowe PTZE - materialy.pdf
XIX Sympozjum PTZE, Worliny 2009 specimen can be measured by two coils slipped into holes of the specimen. These six signals can be measured by a NI-DAQ card installed on a PC, and a LabVIEW based software controls the measurements. The implemented controller can be used to generate any kind of magnetic flux density pattern. Fig. 2 presents the magnetic field intensity and the magnetic flux density in the case of circular magnetic flux. Higher harmonics can also be generated by the implemented controller. The measurement system, the sensors, and the program will be presented in the full paper. Acknowledgement Fig. 2. Loci of the magnetic field intensity and the magnetic flux density This paper was supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences (BO/00064/06), by Széchenyi István University, and by the Hungarian Scientific Research Fund (OTKA PD 73242), and by Hungarian Science and Technology Foundation (OMFB-00725/2008). References [1] M. Kuczmann, Numerical analysis of a 2D vector hysteresis measurement system under construction, Journal of Electrical Engineering, Vol. 57, No. 8/S, 2006, pp. 44−47. [2] M. Kuczmann, Simulation of a vector hysteresis measurement system taking hysteresis into account by the vector Preisach model,Physica B, vol. 403, 2008, pp. 433-436. [3] M. Kuczmann, A. Iványi, The Finite Element Method in Magnetics, Akadémiai Kiadó, Budapest, 2008. 90
XIX Sympozjum PTZE, Worliny 2009 TEMPERATURE DEPENDENCE IN HUMAN BODY FROM MODEL PARAMETERS IN RF HYPERTHERMIA Eugeniusz Kurgan, Piotr Gas AGH University of Science and Technology Deptartment of Electrical and Power Control Engineering al. Mickiewicza 30, 30-059 Kraków, Poland e-mail: kurgan@agh.edu.pl, piotr.gas@agh.edu.pl Abstract: Knowledge of the temperature distribution in human body is of great importance in hyperthermial treatment of tumors. First distribution of induced current density in tissues is calculated and next bioheat equation is solved. Dependence of sensitivity of the maximum temperature distribution in the body from different model parameters are calculated. Keywords: hyperthermia, Specific Absorption Rate, finite element method. Introduction Electromagnetically induced current in radiofrequency range has recently become the preferred mode of energy delivery for the tumor destruction or sensitization. The high current density near the tumor generates heat which rapidly increases the tissue temperature, causing desiccation and protein structural change in macromolecules. In comparison with other methods as, for example, high-energy direct-current, the advantages of radiofrequency radiation therapy are that energy can be delivered in a graded manner by changing exciting current density, it does not require general anesthesia, it can produce a homogeneous region of necrosis. The synergistic behavior between hyperthermia and chemo- and radiotherapy is a well-known phenomenon and in the last time hyperthermia experiences increasing attention of medical world [1]. In this article distribution of the electromagnetic field components and temperature are calculated. Knowledge of temperature distribution in human body is of great importance in hyperthermial treatment of tumors. First distribution of induced current density in tissues is calculated and next bioheat equation is solved. Computed temperature distribution allow as optimal determination of electric parameters exciting coil in such a way that temperature attain its maximum value in the tumor and surrounding tissues. Main equations Around the human body a cylindrical coil with excitation current is placed as in Figure 1. 91
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<strong>XIX</strong> <strong>Sympozjum</strong> <strong>PTZE</strong>, Worliny 2009<br />
specimen can be measured by two coils slipped into holes of the specimen. These six signals<br />
can be measured by a NI-DAQ card installed on a PC, and a LabVIEW based software<br />
controls the measurements. The implemented controller can be used to generate any kind of<br />
magnetic flux density pattern. Fig. 2 presents the magnetic field intensity and the magnetic<br />
flux density in the case of circular magnetic flux. Higher harmonics can also be generated by<br />
the implemented controller. The measurement system, the sensors, and the program will be<br />
presented in the full paper.<br />
Acknowledgement<br />
Fig. 2. Loci of the magnetic field intensity and the magnetic flux density<br />
This paper was supported by the János Bolyai Research Scholarship of the Hungarian<br />
Academy of Sciences (BO/00064/06), by Széchenyi István University, and by the Hungarian<br />
Scientific Research Fund (OTKA PD 73242), and by Hungarian Science and Technology<br />
Foundation (OMFB-00725/2008).<br />
References<br />
[1] M. Kuczmann, Numerical analysis of a 2D vector hysteresis measurement system under<br />
construction, Journal of Electrical Engineering, Vol. 57, No. 8/S, 2006, pp. 44−47.<br />
[2] M. Kuczmann, Simulation of a vector hysteresis measurement system taking hysteresis into<br />
account by the vector Preisach model,Physica B, vol. 403, 2008, pp. 433-436.<br />
[3] M. Kuczmann, A. Iványi, The Finite Element Method in Magnetics, Akadémiai Kiadó,<br />
Budapest, 2008.<br />
90