2019
DOI: 10.48084/etasr.2683
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Design and Modeling of a Radiofrequency Coil Derived from a Helmholtz Structure

Abstract: This paper focuses on radiofrequency (RF) coils that can produce a high electromagnetic field homogeneity to be used for magnetic resonance imaging (MRI) applications. The proposed structure is composed of four wire loops symmetrically located on an ellipsoidal surface. The main objective of this work is to improve field homogeneity compared to a standard Helmholtz coil. Numerical simulation was carried out to assess the RF electromagnetic field behavior of the proposed coil. Different electrical modeling and … Show more

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Cited by 7 publications
(6 citation statements)
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“…The structure has a reduced dimension compared to the wavelength, so it is possible to apply the law of Biot-Savart and the principle of superposition to obtain the total field [9] on their axis [10]. The magnetic field of a circular loop of N turns whose plane of the coil is centered at z=+R/2 (field B 1 (z)), is written [11][12] as:…”
Section: Calculation Of the B 1 Magnetic Fieldmentioning
confidence: 99%
“…The structure has a reduced dimension compared to the wavelength, so it is possible to apply the law of Biot-Savart and the principle of superposition to obtain the total field [9] on their axis [10]. The magnetic field of a circular loop of N turns whose plane of the coil is centered at z=+R/2 (field B 1 (z)), is written [11][12] as:…”
Section: Calculation Of the B 1 Magnetic Fieldmentioning
confidence: 99%
“…In this experiment, four ASBR reactors [8] were used, with an effective volume of 2 L, and electrified coils [9] were set outside the reactors to control the magnetic field intensity. In the experiment, the average magnetic field strengths in the four reactors were controlled to be 0 mT, 35 mT, 50 mT and 80 mT, respectively.…”
Section: Test Materials and Devicesmentioning
confidence: 99%
“…To calculate the electromagnetic field (B 1 ) produced by the proposed square and circular Helmholtz structures which consist of two symmetrical elements and have small dimensions compared to the wavelength, the superposition principle can be applied to obtain the total field as indicated in (2) and ( 5) for circular and square patterns [11][12][13]. The simulation code for the double square coil is programmed in MATLAB for a typical input data of I=1A, d=2.77cm, a=5cm, N=1, and µ 0 =4π×10 -7 mkgs -2 A -2 .…”
Section: Field Calculation and Pattern Plotmentioning
confidence: 99%