Publikace

Research of interactions between Electromagnetic (EM) Field and biological systems is of growing interests elsewhere. In this area of research very important activity are studies of prospective medical applications of microwaves (i.e. a possibility to use microwave energy and/or microwave technique and technology for treatment purposes) are a quite new and a very rapidly developing field. Microwave thermotherapy is being used in medicine for the cancer treatment and for some other diseases since early eighties. Most common methods used for treatment of cancer are radiotherapy and chemotherapy. These therapeutic methods have many undesirable effects, such as usage of ionizing radiation. Another method used for treatment of cancer is hyperthermia.

The chapter deals with an electrical description of biological tissues, analysis of the reflection coefficient measurement method, feasibility study of different measurement probes, development of model for numerical modeling and simulations and experimental measurement of various biological substances for applications in the basic research on biological effects of electromagnetic fields and for medical diagnostics and imaging. A non-destructive and non-invasive method based on the reflection coefficient measurement is used. Relation between the reflection coefficient and complex permittivity is derived using the Deschamps? theorem. Two types of coaxial probes are under investigation and feasibility study of waveguide probes is presented. Vector measurements of the reflection coefficient are performed in the frequency range from 300 kHz to 3 GHz. Numerical modeling is compared with measurement. Measurement uncertainty is evaluated.

Paper deals with a study of dynamic permitivity for various modes configurations, which are excited in annular resonator.

Paper deals with modes configurations, which are excited in annular resonator.

Paper deals with a study of evanescent mode aplikcator for superficial and subcutaneous hyperthermia for cancer treatment.

Analysis and evaluation of a new antenna array system for microwave hyperthermia is being described in this paper.This antenna array was evaluated by the focusing method based on the time-reversal principle.Power absorption distributions in a cylindrical homogeneous and inhomogeneous phantom were calculated for the frequency range 500-900 MHz. Two set-ups with 12 and 16 antennas were analysed by comparing changes in focusing areas enclosed by the 50%, 75% and 90% iso-SAR contours. The sharpest focusing area in the centre of the phantom, 151mm2 (920mm) (90% iso-SAR), was obtained by using 16 antennas at frequency 900 MHz. The largest focusing area of 280mm2 (1324mm) (90% iso-SAR) was obtained by using 16 antennas at 500 MHz. The conducted study confirms the feasibility of the time-reversal-based focusing methods for microwave hyperthermia. The proposed system shows promise and is suitable for further development in the treatment of head and neck tumours, and extremities applicatio

This paper deals with a reserach of intracavitary applicators for microwave thermotherapy (e.g. cancer treatment or Benign Prostate Hyperplasia treatment). During this feasibility study sbove all combination of monopole and helix structure were studied and experimentaly evaluated.