P. Syrek

Therapy's individualization of bone injuries with the magnetic field applicators

Individualization of therapy for each patient is difficult to carry out because of computational complexity. However, there is a possibility to obtain the view on the construction of the apparatus used in magnetotherapy by series of optimization processes. The results presented in this publication show that the construction and location of the device may vary significantly depending on the criteria.

Parametric curves to trace the TMS coils windings

Unambiguous design of each coil, applied in Transcranial Magnetic Stimulation (TMS) procedure, involves assigning it a set of parameters. The use of just a few or several, real-valued parameters for this purpose is convenient, and renders the optimization procedure less complicated. Hence, using parametric curves is an appropriate method. Several types of coils used in TMS procedure are presented. Each of them is characterized by a set of parameters that, coupled with five others that describe the shift and rotation of the coil in space, allow a clear characterization of the device, as well as its position relative to the patients body. This approach is related to the basic aspects of optimization in biomedical engineering.

Simple hierarchical models of the Transcranial Magnetic Stimulation

This paper proposes simple models of high computational efficiency for Transcranial Magnetic Stimulation (TMS). Since the magnetic field is produced by currents of low frequency, the physical model is based on a unidirectional coupling between a Magneto-“Steady-state” (MG) formulation and an Electric Conduction (EC) formulation. The coupling is ensured by the Faradays law of induction and it is unidirectional because the magnetic effect of the resultant eddy currents is neglected. The models we propose consider simplified geometries. However, the source coil in which an imposed current flows is described by a parametric curve, which can be of any shape. The human head is modeled by a conductive homogeneous sphere. The paper describes all the modeling steps: geometrical, physical, mathematical, analytical, numerical and computational models. Numerical results are compared with analytical ones and, aiming to quantify the uncertainties (UQ), the expression of the modeling error was determined. The result is a hierarchical series of approximate surrogate models, which have different levels of accuracy and complexity. The performed UQ may be used to control the modeling error, keeping the complexity at a minimal level. Three test cases are studied, for different shapes of the source coil: 1-circular, 2-circular planar 8-shaped, 3-circular arranged in the 3D space.

Oddziaływanie aplikatorów pola magnetycznego na stenty

The position of the stent may have a significant impact on its currents induced in the branches. The results are presented for the case that poses the highest danger. The results were obtained for one exemplary construction of the stent. Further research should also take into account a number of other ways of building a stent, and a much more dense mesh created by its branches. (The impact of the magnetic field applicators on stents). Słowa kluczowe: pole magnetyczne, magnetoterapia, stenty, bioelektromagnetyzm, model obwodowy.

Bio-stimulation of camelina seed by magnetic field (Camelina Sativa L.)

It is both physical and chemical factors that affect the crop yield. However, agronomic practices mainly include chemicals, which exhibit a number of side effects. The authors present the study of the impact of pre-sowing magnetic stimulation of camelina seed, with alternating magnetic field, on the germination of seeds. The study of the magnetic field effect was preceded by the analysis of camelina seed shape and distribution of elements on the surface of the seeds, and cross-section scanning with the use of the electron microscope (SEM). The authors also introduce the calculations of the magnetic field distribution inside the model of the seeds placed in the homogeneous magnetic field. Finally, the authors present the result and conclusions drawn from the camelina seed biostimulation with magnetic field, referring to both exposure time and magnetic field induction influencing the seed.