On the handling of stimulation artifacts during simultaneous electroencephalography (EEG) and transcranial low field strength magnetic stimulation (LFMS)

2017 ◽  
Vol 10 (2) ◽  
pp. 343-345
Author(s):  
Vladimir Miskovic ◽  
Karl Kuntzelman ◽  
C. Alex Goddard
Keyword(s):  
Field Strength ◽  
Magnetic Stimulation ◽  
Low Field

Improved Contrast in Ultra-Low-Field MRI with Time-Dependent Bipolar Prepolarizing Fields: Theory and NMR Demonstrations

2013 ◽  
Vol 20 (3) ◽  
pp. 327-336 ◽  
Author(s):  
Jaakko O. Nieminen ◽  
Jens Voigt ◽  
Stefan Hartwig ◽  
Hans Jürgen Scheer ◽  
Martin Burghoff ◽  
...  
Keyword(s):  
Field Strength ◽  
Time Course ◽  
Signal Strength ◽  
Relaxation Rates ◽  
Resonance Imaging ◽  
New Approach ◽  
Spin Lattice ◽  
Low Field ◽  
Low Field Mri ◽  
Magnetic Resonance Imaging Mri

Abstract The spin-lattice (T1) relaxation rates of materials depend on the strength of the external magnetic field in which the relaxation occurs. This T1 dispersion has been suggested to offer a means to discriminate between healthy and cancerous tissue by performing magnetic resonance imaging (MRI) at low magnetic fields. In prepolarized ultra-low-field (ULF) MRI, spin precession is detected in fields of the order of 10-100 μT. To increase the signal strength, the sample is first magnetized with a relatively strong polarizing field. Typically, the polarizing field is kept constant during the polarization period. However, in ULF MRI, the polarizing-field strength can be easily varied to produce a desired time course. This paper describes how a novel variation of the polarizing-field strength and duration can optimize the contrast between two types of tissue having different T1 relaxation dispersions. In addition, NMR experiments showing that the principle works in practice are presented. The described procedure may become a key component for a promising new approach of MRI at ultra-low fields

Comparison of High-Field-Strength Versus Low-Field-Strength MRI of the Shoulder

2003 ◽  
Vol 181 (5) ◽  
pp. 1211-1215 ◽  
Author(s):  
Thomas Magee ◽  
Marc Shapiro ◽  
David Williams
Keyword(s):  
Field Strength ◽  
High Field ◽  
High Field Strength ◽  
Low Field

Chondrolysis of the Glenohumeral Joint After Arthroscopy: Findings on Radiography and Low-Field-Strength MRI

2007 ◽  
Vol 188 (4) ◽  
pp. 1094-1098 ◽  
Author(s):  
Timothy G. Sanders ◽  
Michael B. Zlatkin ◽  
Narayan Babu Paruchuri ◽  
Robert W. Higgins
Keyword(s):  
Field Strength ◽  
Glenohumeral Joint ◽  
Low Field

Accessible Pediatric Neuroimaging Using a Low Field Strength Portable MRI Scanner

2021 ◽  
Author(s):  
Sean Deoni ◽  
Muriel MK Bruchhage ◽  
Jennifer Beauchemin ◽  
Alexandra Volpe ◽  
Viren D'Sa ◽  
...  
Keyword(s):  
Field Strength ◽  
Low Field ◽  
Pediatric Neuroimaging

Information-Guided Surgical Management of Gliomas Using Low-Field-Strength Intraoperative MRI

2010 ◽  
pp. 67-72 ◽  
Author(s):  
Yoshihiro Muragaki ◽  
Hiroshi Iseki ◽  
Takashi Maruyama ◽  
Masahiko Tanaka ◽  
Chie Shinohara ◽  
...  
Keyword(s):  
Field Strength ◽  
Surgical Management ◽  
Intraoperative Mri ◽  
Low Field

A 4 × 4 array multichannel magnetic stimulation system using submillimeter sized planar square spiral coils: The spatial distribution of electromagnetic field

2022 ◽  
pp. 1-18
Author(s):  
Lei Tian ◽  
Limei Song ◽  
Yu Zheng ◽  
Jinhai Wang
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Spatial Distribution ◽  
Field Strength ◽  
Electric Field ◽  
Magnetic Stimulation ◽  
Spiral Coil ◽  
Average Magnetic Field ◽  
Stimulation System ◽  
Field Strengths

Multi-coil magnetic stimulation has advantages over single-coil magnetic stimulation, such as more accurate targeting and larger stimulation range. In this paper, a 4 × 4 array multichannel magnetic stimulation system based on a submillimeter planar square spiral coil is proposed. The effects of multiple currents with different directions on the electromagnetic field strength and the focusing zone of the array-structured magnetic stimulation system are studied. The spatial distribution characteristics of the electromagnetic field are discussed. In addition, a method is proposed that can predict the spatial distributions of the electric and magnetic fields when currents in different directions are applied to the array-structured magnetic stimulation system. The study results show that in the section of z = 2 μm, the maximum and average magnetic field strengths of the array-structured magnetic stimulation system are 6.39 mT and 2.68 mT, respectively. The maximum and average electric field strengths are 614.7 mV/m and 122.82 mV/m, respectively, where 84.39% of the measured electric field values are greater than 73 mV/m. The average magnetic field strength of the focusing zone, i.e., the zone in between the two coils, is 3.38 mT with a mean square deviation of 0.18. Therefore, the array-structured multi-channel magnetic stimulation system based on a planar square spiral coil can have a small size of 412 μm × 412 μm × 1.7 μm, which helps improving the spatial distribution of electromagnetic field and increase the effectiveness of magnetic stimulation. The main contribution of this paper is a method for designing multichannel micro-magnetic stimulation devices.

scholarly journals Opportunities in Interventional and Diagnostic Imaging by Using High-Performance Low-Field-Strength MRI

Radiology ◽  
2019 ◽  
Vol 293 (2) ◽  
pp. 384-393 ◽  
Author(s):  
Adrienne E. Campbell-Washburn ◽  
Rajiv Ramasawmy ◽  
Matthew C. Restivo ◽  
Ipshita Bhattacharya ◽  
Burcu Basar ◽  
...  
Keyword(s):  
Field Strength ◽  
Diagnostic Imaging ◽  
High Performance ◽  
Low Field
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