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Finding neuroelectric activity under magnetic-field oscillations (NAMO) with magnetic resonance imaging in vivo
2006
Proceedings of the National Academy of Sciences of the United States of America
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Electrical stimulation of the median nerve was achieved by applying a series of 1 ms-long current pulses, triggered at the onset of the negative lobes of the oscillating gradients. ...
We therefore extended this technique by incorporating a series of oscillating magnetic field gradients applied in synchrony with the stimulation to drastically increase its sensitivity, and we recently ...
Tozer for their assistance with the MRI scanning; R. Segal and C. Lin for performing the electromyography measurements; A. Perkins and T. ...
doi:10.1073/pnas.0605486103
pmid:16894177
pmcid:PMC1567924
fatcat:lwcdmnbjyrerpnbgtedgo64aci
Lorentz effect imaging of ionic currents in solution
2008
Journal of magnetic resonance (San Diego, Calif. 1997 : Print)
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oscillating gradients. ...
References Fig. 1 : 1 (A) Axial images of the phantom acquired with different current amplitudes and polarities. (B) Difference images with the reference image acquired without current. ...
doi:10.1016/j.jmr.2007.12.005
pmid:18180187
fatcat:tfjsb7l5jrc5fnerixbr2s3eum
Synchronized detection of minute electrical currents with MRI using Lorentz effect imaging
2006
Journal of magnetic resonance (San Diego, Calif. 1997 : Print)
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its feasibility for imaging randomly oriented electrical currents on the order of microamperes with a temporal resolution on the order of milliseconds in gel phantoms. ...
The blood oxygenation level-dependent (BOLD) effect is the most commonly used contrast mechanism in functional magnetic resonance imaging (fMRI), due to its relatively high spatial resolution and sensitivity ...
Axial images were acquired with oscillating gradients applied in the direction orthogonal to both the wire and the main magnetic field, since the Lorentz force-induced displacement occurs in that direction ...
doi:10.1016/j.jmr.2005.11.012
pmid:16343959
pmcid:PMC1540538
fatcat:jdnkrec3yzen5ei5ixcoz77fdi
The role of magnetic forces in biology and medicine
2011
Experimental biology and medicine
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of conductivity, 4) magneto-acoustic tomography with magnetic induction, and 5) Lorentz force imaging of action currents using magnetic resonance imaging. ...
The Lorentz force (the force acting on currents in a magnetic field) plays an increasingly larger role in techniques to image current and conductivity. ...
I focus on magnetic forces that act on electric current, with an emphasis on how these forces can be used to image current or conductivity. ...
doi:10.1258/ebm.2010.010236
pmid:21321309
pmcid:PMC3079438
fatcat:tal4xkrixzaijmfoiwaaxsglsi
Reduction of flow- and eddy-currents-induced image artifacts in coronary magnetic resonance angiography using a linear centric-encoding SSFP sequence
2007
Magnetic Resonance Imaging
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Flow and gradient switching induced eddy currents are important sources of such phase errors, especially under off-resonant condition. ...
In conclusion, flow and eddy currents induced imaging artifacts in coronary MRA using SSFP sequence can be markedly reduced with LCE acquisition of PE lines. ...
Eddy current is induced by the electric fields resulting from changing magnetic flux (6) . ...
doi:10.1016/j.mri.2007.01.004
pmid:17905246
pmcid:PMC2084053
fatcat:74rxukb7qfhajau4jqtwb4wk2a
High resolution in-operando microimaging of solar cells with pulsed electrically-detected magnetic resonance
2015
Journal of magnetic resonance (San Diego, Calif. 1997 : Print)
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electric current of the device while inducing electron spin-flip transitions. ...
the electrical current of the sample. ...
(a) Drawing of the cryogenic pEDMRI probe with electrical and optical supply lines, the gradient coil array, and the resonator insertion module with mounted solar cell. ...
doi:10.1016/j.jmr.2014.11.008
pmid:25557860
fatcat:35tnsttvkvaxxes3ktf7bqpsve
Electromagnetohydrodynamic modeling of Lorentz Effect Imaging
2013
Journal of magnetic resonance (San Diego, Calif. 1997 : Print)
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Three computational models of an electrolyte-filled phantom subject to an applied current dipole, synchronized to oscillating magnetic field gradients of an LEI protocol, were developed to determine the ...
The simulated images were compared to images from previous LEI phantom experiments with identical properties for different stimulus current amplitudes and polarities. ...
The motion-induced phase accumulation of each particle spin, p, is therefore enhanced by the application of oscillating gradients over the total oscillating gradient period. ...
doi:10.1016/j.jmr.2013.08.011
pmid:24056273
pmcid:PMC3818387
fatcat:fqucfzxm35evjn5jsyqc2mg7a4
Ultrasensitive mechanical detection of magnetic moment using a commercial disk drive write head
2016
Nature Communications
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In addition, we demonstrate quantitative imaging of the pole field with about 10 nm spatial resolution. ...
Sensitive detection of weak magnetic moments is an essential capability in many areas of nanoscale science and technology, including nanomagnetism, quantum readout of spins, and nanoscale magnetic resonance ...
The oscillating field in turn induces an oscillating sample magnetization M ¼ wB/m 0 . ...
doi:10.1038/ncomms12714
pmid:27647039
pmcid:PMC5034305
fatcat:57cnisqqvbgovnut33frw7tjye
Selective addressing of solid-state spins at the nanoscale via magnetic resonance frequency encoding
2017
npj Quantum Information
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Tailored application of gradient fields and resonant microwaves allow site-selective nitrogen vacancy spin manipulation and sensing applications, including Rabi oscillations, imaging, and nuclear magnetic ...
Microcoils fabricated on the diamond chip provide electrically tuneable magnetic field gradients~0.1 G/nm. ...
We gratefully acknowledge the provision of diamond samples by Element 6 and helpful technical and theoretical discussions with Liang Jiang and Nathalie de Leon. ...
doi:10.1038/s41534-017-0033-3
fatcat:g5rc4iaolbhofox2dpuiguyec4
Magnetic resonance imaging of time-varying magnetic fields from therapeutic devices
2013
NMR in Biomedicine
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While magnetic resonance imaging of static magnetic fields generated by external probes has been previously demonstrated, there is an unmet need to image time-varying magnetic fields, such as those generated ...
The method is able to reconstruct the three-dimensional components of the oscillating magnetic field vector. ...
of the electrical properties (permittivity, conductivity, …, etc.) of the tissue is known. ...
doi:10.1002/nbm.2919
pmid:23355446
pmcid:PMC3645268
fatcat:dkbezf2pjvadhh6qmet2y2nbly
Magnetic-Resonance-Based Electrical Properties Tomography: A Review
2014
IEEE Reviews in Biomedical Engineering
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in quantifying radiofrequency (RF) coil induced Specific Absorption Rate (SAR) which is a major safety concern in high-and ultrahigh-field Magnetic Resonance Imaging (MRI) applications. ...
Recently introduced Electrical Properties Tomography (EPT) approaches utilize the measurable RF magnetic field induced by the RF coil in an MRI system to quantitatively reconstruct the EP distribution ...
from Magnetic Resonance Current Density Imaging (MRCDI) [30] , [31] , measures the local magnetic field induced by surface current injection, and reconstructs static cross-sectional conductivity images ...
doi:10.1109/rbme.2013.2297206
pmid:24803104
pmcid:PMC4113345
fatcat:g74halcdmzgfjge4m3qv7mezpe
Selective addressing of solid-state spins at the nanoscale via magnetic resonance frequency encoding
[article]
2016
arXiv
pre-print
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Tailored application of gradient fields and resonant microwaves allow site-selective NV spin manipulation and sensing applications, including Rabi oscillations, imaging, and nuclear magnetic resonance ...
Microcoils fabricated on the diamond chip provide electrically tuneable magnetic-field gradients ~0.1 G/nm. ...
We gratefully acknowledge the provision of diamond samples by Element 6 and helpful technical and theoretical discussions with Liang Jiang and Nathalie de Leon.
Author Contributions ...
arXiv:1610.06630v1
fatcat:4ppheyeqlvh27mek3ayni7wpku
Magnetic Resonance Imaging System Based on Earth's Magnetic Field
2004
Instrumentation Science & Technology
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This article describes both the setup and the use of a system for magnetic resonance imaging (MRI) in the Earth's magnetic field. ...
A reference signal of a fixed-frequency oscillator cannot be used since the Larmor frequency changes with time, following temporal fluctuations of Earth's magnetic field. ...
As the current in the coils decays after a few oscillations, the magnetization remains in the plane perpendicular to B 0 and free induction signal is induced. ...
doi:10.1081/ci-200037034
fatcat:k4nqkis7vrdcrkppkudgsy4emu
Artifacts in Magnetic Resonance Imaging
[chapter]
2016
Image Principles, Neck, and the Brain
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With the expected proliferation of these neural probes and potential clinical adoption, the magnetic resonance imaging (MRI) compatibility of GC microstructures needs to be established to help validate ...
We also showed that because of their low magnetic susceptibility and lower conductivity, the GC microelectrodes caused almost no susceptibility shift artifacts and no eddy-current-induced artifacts compared ...
circuit mode. d Measurement of the induced current using a shunt resistor of 1 Ω Comparison of magnetic resonance imaging artifact of GC and Pt microelectrode from T1 -weighted and T2-weighted images captured ...
doi:10.1201/b19609-10
fatcat:qsyhl4zxbngtjp3vttbfz2ir4m
Spin readout of trapped electron qubits
2017
Physical Review A
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We propose a scheme to read out the spin of a single electron quantum bit in a surface Paul trap using oscillating magnetic field gradients. ...
An analysis of the the four procedures shows short measurement times (25 μs) and high fidelities (99.7%) are achievable with realistic experimental parameters. ...
Leibfried for pointing out the problem with the electric field produced by current-carrying wires. ...
doi:10.1103/physreva.95.012312
fatcat:b45pts5bgvhw5p4tigm2lwnvuq
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