Multichannel Magnetic Stimulation System Design Considering Mutual Couplings Among the Stimulation Coils

Han, Byung Hee; Chun, In Kon; Lee, S.C.; Lee, S.Y.

doi:10.1109/tbme.2004.824123

Cited by 42 publications

(25 citation statements)

References 14 publications

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“…Other designs such as single-layer coil arrays have no way to address dead zones, and even other multi-layer arrays do not have full control over the current direction, so they are not able to fully manipulate the return currents. Proximity effects such as mutual coupling [29], degraded Q and distorted current waveforms, caused by coil to coil interaction, are mitigated by our ability to power down, ground non-energized coils and control individual coil current levels. This bears further study and is being reported in a forthcoming paper.…”

Section: B Excitation Principles Using Multi-coil or Dense Arraysmentioning

confidence: 99%

“…In this specific use case, with all coils energized the benefit of closer proximities provided by hexagonal coils is increased coupling cancellation. To reiterate, proximity effects such as mutual coupling [29], degraded Q and distorted current waveforms, caused by unwanted coil to coil interaction, is mitigated by our ability to power down, ground non-energized coils and control individual coil current levels. It has also been reported in the literature that hexagonal shaped coils have more uniform fields than that of circular or square coils [39].…”

Section: B Controllable Depth Of Penetrationmentioning

confidence: 99%

See 1 more Smart Citation

A Multifunction Dense Array System With Reconfigurable Depth of Penetration

Smith

Sievenpiper

2021

IEEE J. Electromagn. RF Microw. Med. Biol.

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Noninvasive neuromodulation techniques such as Transcranial Magnetic Stimulation are enabled by electromagnetic induction with applications in neuroscience research and the treatment of neurological disorders. Current systems are effective but research continues on improving key performance metrics such as precise targeting, focality, and depth of penetration. Additional functions are also being studied; tunable excitation field patterning, reconfigurable depth of penetration, multiple excitation sites, power efficient waveforms and reduced extraneous excitation. Multichannel, multi-coil arrays show promise in achieving many of these parameters in one multifunctional array as opposed to the single-function commercial coils (circular, figure-8 or H coil) being used today.As such, our central focus is to determine whether multifunction dense arrays, despite their many challenges, are a tractable technical approach for future neuromodulation systems. Therefore, the results in this paper are twofold. First, we report the design, fabrication and demonstration of a scalable multichannel (12 channels) or multifunction dense array system to assess the potential to perform these functions in one system. Second, we demonstrate that the depth of penetration of the magnetic field can be reconfigured by varying current magnitude and phase of the smaller coil diameters in the array to achieve the same decay profile performance of a larger diameter coil. Only simulations exist in the literature to date, to the best of our knowledge, we report the first measurements of hexagonal shaped coils in multi-coil arrays have increased depth of penetration over circular shaped coil-based arrays.

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Section: B Excitation Principles Using Multi-coil or Dense Arraysmentioning

confidence: 99%

Section: B Controllable Depth Of Penetrationmentioning

confidence: 99%

A Multifunction Dense Array System With Reconfigurable Depth of Penetration

Smith

Sievenpiper

2021

IEEE J. Electromagn. RF Microw. Med. Biol.

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“…Several approaches use a flat or curved grid of approximately equally sized loops (Han, Chun, Lee, & Lee, 2004; Ho, et al, 2009; Laudani, et al, 2015; Ruohonen & Ilmoniemi, 1998; Ruohonen, et al, 1999; X. Wang, Chen, Guo, & Wang, 2005).…”

Section: What Are the Major Developments In Tms Technology?mentioning

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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“…The mutual coupling could induce currents at adjacent coils, which could influence the spatial localization of the stimulation when the coil array has a high magnetic coupling configuration. However, the coupling effect can be compensated by proper control of the charge voltages [9]. When the figure-of-8 coils have the current of the same direction, different type has different focality.…”

Section: Figure-of-8 Coilsmentioning

confidence: 99%

Comprehention of Coils Overlappings Effects —Magnetic Resonance Imaging

Khoozani¹,

Kelk²,

Khoozani³

2015

OALib

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A typical medical Magnetic Resonance Imaging (MRI) contains a Local transmit/receive coil. Magnetic coil design is very important in study of the human brain and for neurological therapeutics technique. Precise spatial localization of stimulation sites is the key of efficient functional magnetic stimulations. Others have examined this issue at radio frequencies. This paper develops circular coils, figure-of-8 coils and coil array elements in order to realize a transcranial magnetic stimulator, and analyses the coil properties. The tests are done here with the applied DC excitation. The results show that different coils have different focus. The most important feature of these simulations is the ability to expand it. With these tests, the procedure of construction is determined. I simulate all procedures by MAXWELL 16.0.

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Multichannel Magnetic Stimulation System Design Considering Mutual Couplings Among the Stimulation Coils

Cited by 42 publications

References 14 publications

A Multifunction Dense Array System With Reconfigurable Depth of Penetration

A Multifunction Dense Array System With Reconfigurable Depth of Penetration

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

Comprehention of Coils Overlappings Effects —Magnetic Resonance Imaging

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