Multi channel high-T/sub c/ scanning SQUID microscope

The recent results of Holzer and co-workers reveal the existence of net currents that flow along the front of a planar wave propagating through cardiac tissue. This is an important contribution toward the better understanding of the physics of biomagnetic fields. However, although the authors claim their results reveal particular bidomain properties, we show in this short letter that the results allow multiple interpretations. For instance, cardiac anisotropy by itself may also explain the existence of a net current along the wave front. Based on our calculations, we suggest additional experiments that would allow distinguishing between these two explanations and thus provide further evidence on the basic physics behind cardiac biomagnetism.

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“…1. A SQUID microscope design with a vertical pickup coil (Matthews et al, 2003) would be able to measure the horizontal B y and B x components.…”

Section: Proposal Of Additional Experimentsmentioning

confidence: 99%

Interpreting Biomagnetic Fields of Planar Wave Fronts in Cardiac Muscle

Santos

Koch

2005

Biophysical Journal

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“…In other cases, the research focused in the development of specific devices, such as in the growth of nitride films in the development of LED devices or in the fabrication of thin waveguiding films [26,27]. PLD has also proven to be very effective in the growth of crystalline oxides, [28] or PLD-grown of high-temperature superconducting films (HTS), whose applications include high-frequency electronics for radio frequency, microwave communications, and superconducting quantum interference devices (SQUIDs) for the detection of magnetic fields [29]. In the area of wireless communication, radio frequency filters based on HTS thin films presents excellent results by reducing interference from out-of-band signals due to the low loss in the microwave frequency range for epitaxial oxide superconducting films in which PLD is extremely effective at production [30,31].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a Cell Electrostimulator Using Pulse Laser Deposition and Laser Selective Thin Film Removal

Beloso¹,

Varela²,

Rodríguez³

et al. 2017

Laser Ablation - From Fundamentals to Applications

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In this work, we present a laser-based process for fabricating a cell electrostimulator. The fabrication methodology comprises two laser processes: a pulse laser deposition (PLD) of an aluminum thin film on soda-lime glass and a laser-based selectively removal of the thin film. The laser set-up for PLD consist of Nd:YVO 4 Rofin Power line 20E (1064 nm wavelength, 20 ns pulse width) focused by a lens of 160 mm focal length inside a vacuum chamber to strike a target of the deposited material. The same laser is used for selectively removing the thin film but focused by a lens of 100 mm focal length. The geometry design is made in CAD-like software. Before microfabrication, a thin aluminum layer (1 μm thickness) is deposited on soda-lime glass using the PLD method. In order to assemble the device, the electrical stimulator is placed between two polycarbonate sheets of 1.5 mm thickness. To prevent any contact with the electric circuit, a thin silicate glass (100 μm) is placed over the electrostimulator. Simulations were performed using ANSYS Maxwell software, verifying that the induced electrical field achieves the minimum for cell stimulation.

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Superconducting Magnets in Accelerators

Sharma

2021

Springer Series in Materials Science

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Multi channel high-T/sub c/ scanning SQUID microscope

Cited by 7 publications

References 9 publications

Interpreting Biomagnetic Fields of Planar Wave Fronts in Cardiac Muscle

Interpreting Biomagnetic Fields of Planar Wave Fronts in Cardiac Muscle

Fabrication of a Cell Electrostimulator Using Pulse Laser Deposition and Laser Selective Thin Film Removal

Superconducting Magnets in Accelerators

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