Numerical model of magnetic stimulation with metal implants

Sawicki, Bartosz; Starzyński, Jacek; Wincenciak, S.

doi:10.1109/tmag.2006.872012

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…The average size of these magnetic entities can be assessed from the magnitude of the temperature at which the maximum on the ZFC is seen. This maximum defines the so-called (mean) blocking temperature ( T B ) of the distribution, which is related to the (mean) volume ( V ) occupied by the supermoments through T normalB = K V 25 italick normalB where K , the anisotropy constant in (Ga,Mn)As, ranges between 5000 to 50000 erg/cm 3 , and the factor 25 represents the typical acquisition time in SQUID magnetometry of about 100 s. From these numbers, we obtain that the mean volume occupied by the supermoments corresponds to a sphere of a diameter between 15 to 30 nm. The lower bound fits perfectly to the typical NWs shell width, and the larger values still can be realized here if the FM coupled volumes assume oblate shapes sprawled around the perimeter of the NWs shell.…”

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confidence: 97%

All-Wurtzite (In,Ga)As-(Ga,Mn)As Core–Shell Nanowires Grown by Molecular Beam Epitaxy

et al. 2014

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confidence: 97%

All-Wurtzite (In,Ga)As-(Ga,Mn)As Core–Shell Nanowires Grown by Molecular Beam Epitaxy

et al. 2014

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“…The effectiveness of therapy with using the electromagnetic field depends mainly on the value of magnetic induction and its distribution inside the applicator. Simulation and graphical visualization of the field distribution in appropriate choice of the user's specific needs [7][8][9].…”

Section: Fig 1 Examples Of Solenoid Applicatorsmentioning

confidence: 99%

The Impact of Applicator Size on Distribution of Electromagnetic Field Used In Magnetotherapy

Łada-Tondyra¹

2019

ELECTROTECHNICAL REVIEW

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Electromagnetic field is used in magnetotherapy. The therapy effectiveness depends on the value of magnetic induction and its distribution in applicators. An important problem is an appropriate choice of an applicator to be used in the therapy. The results presented in the paper shows that the applicators size determines the magnetic induction distribution inside the solenoid, generated for the same excitation conditions. Streszczenie. Pole elektromagnetyczne jest używane w magnetoterapii. Skuteczność terapii zależy od wartości indukcji magnetycznej i jej rozkładu wewnątrz aplikatora. Istotnym problemem jest odpowiedni wybór aplikatora zastosowanego w terapii. Wyniki przedstawione w artykule pokazują, że rozmiar aplikatora ma wpływ na rozkład indukcji magnetycznej wewnątrz solenoidu przy jednakowych warunków wzbudzenia. (Wpływ rozmiaru aplikatora na rozkład pola elektromagnetycznego stosowanego w magnetoterapii)

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“…To enhance stability and increase speed, magnetic stimulation has been modeled with a variety of equation systems derived from Maxwell’s equations. Alternative equation systems are, for instance, the T-Ω formulation to enforce stability by a more appropriate choice of potentials, and various ways to decouple the coil and the induced currents so that the back-action of the small induced current on the coil current (Goetz, Afinowi, et al, 2013; Golestanirad, Mattes, Mosig, & Pollo, 2010; Miranda, Hallett, & Basser, 2003; Opitz, et al, 2011; Sawicki, Starzynski, & Wincenciak, 2006; Thielscher, Opitz, & Windhoff, 2011; Wagner et al, 2008; Wagner et al, 2014; Yang et al, 2006). The so-called A - V formulation of the magnetic field first solves the magnetic vector potential ( A ), then in a second step, derives the electric scalar potential ( V ).…”

Section: Models Of the Induced Electric Field Distributionmentioning

confidence: 99%

The development and modelling of devices and paradigms for transcranial magnetic stimulation

Goetz

Deng

2017

International Review of Psychiatry

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Magnetic stimulation is a noninvasive neurostimulation technique that can evoke action potentials and modulate neural circuits through induced electric fields. Biophysical models of magnetic stimulation have become a major driver for technological developments and the understanding of the mechanisms of magnetic neurostimulation and neuromodulation. Major technological developments involve stimulation coils with different spatial characteristics and pulse sources to control the pulse waveform. While early technological developments were the result of manual design and invention processes, there is a trend in both stimulation coil and pulse source design to mathematically optimize parameters with the help of computational models. To date, macroscopically highly realistic spatial models of the brain as well as peripheral targets, and user-friendly software packages enable researchers and practitioners to simulate the treatment-specific and induced electric field distribution in the brains of individual subjects and patients. Neuron models further introduce the microscopic level of neural activation to understand the influence of activation dynamics in response to different pulse shapes. A number of models that were designed for online calibration to extract otherwise covert information and biomarkers from the neural system recently form a third branch of modeling.

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Numerical model of magnetic stimulation with metal implants

Cited by 9 publications

References 5 publications

All-Wurtzite (In,Ga)As-(Ga,Mn)As Core–Shell Nanowires Grown by Molecular Beam Epitaxy

All-Wurtzite (In,Ga)As-(Ga,Mn)As Core–Shell Nanowires Grown by Molecular Beam Epitaxy

The Impact of Applicator Size on Distribution of Electromagnetic Field Used In Magnetotherapy

The development and modelling of devices and paradigms for transcranial magnetic stimulation

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