scholarly journals Evaluation of magnetic field homogeneity using in-out signal cycle mapping in gradient recalled echo images of a mixed water/oil phantom as a rough indication for daily quality control

2016 ◽  
Vol 6 (2) ◽  
Author(s):  
Yoshiyuki Ishimori ◽  
Hiraku Kawamura ◽  
Masahiko Monma
Keyword(s):  
Magnetic Field ◽  
Quality Control ◽  
Magnetic Field Homogeneity ◽  
Field Homogeneity ◽  
Mixed Water

A Least Square Method for Measurement and Optimisation in Selected Physical Experiments

2005 ◽  
Vol 295-296 ◽  
pp. 681-686 ◽  
Author(s):  
I. Frollo ◽  
P. Andris ◽  
I. Strolka ◽  
L. Bačiak
Keyword(s):  
Magnetic Field ◽  
Input Parameter ◽  
Target Function ◽  
Least Square Method ◽  
Least Square ◽  
Physical Experiments ◽  
Magnetic Field Homogeneity ◽  
Field Homogeneity ◽  
Basic Parameters ◽  
Shim Coils

The scope of this paper is to demonstrate a least square method for optimisation of basic parameters for selected physical experiment design where large input parameter measurement and adjustment is needed. The speed of calculation and experimentally verified results are promising to use this method in many physical projects. We have demonstrated this method for computation of feeding currents of correcting coils for stationary magnetic field used in NMR imaging. A set of linear equation definition and determination of a target function and optimisation computations are presented with procedures that provide optimal values of currents for shim coils. The proposed method, because of its simplicity and speed of computation, is convenient for basic adjustment of the magnetic field homogeneity by the first magnet installation. It is also suitable for periodic testing and magnet inhomogeneity correction for MRI magnets.

scholarly journals Optimization of the Magnetic Field Homogeneity Area for Solenoid Type Magnets

2018 ◽  
Vol 173 ◽  
pp. 03018
Author(s):  
Eugene Perepelkin ◽  
Rima Polyakova ◽  
Aleksandr Tarelkin ◽  
Alexander Kovalenko ◽  
Pavel Sysoev ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Homogeneous Field ◽  
Magnetic Field Homogeneity ◽  
Field Homogeneity ◽  
Modern Physics ◽  
Nica Project ◽  
The Magnetic Field

Homogeneous magnetic fields are important requisites in modern physics research. In this paper we discuss the problem of magnetic field homogeneity area maximization for solenoid magnets. We discuss A-model and B-model, which are basic types of solenoid magnets used to provide a homogeneous field, and methods for their optimization. We propose C-model which can be used for the NICA project. We have also carried out a cross-check of the C-model with the parameters stated for the CLEO II detector.

scholarly journals Magnetic field computation and simulation of the coil systems using Comsol software

2018 ◽  
Vol 160 ◽  
pp. 01006 ◽  
Author(s):  
Ivan Zatonov ◽  
Pavel Baranov ◽  
Andrey Kolomeycev
Keyword(s):  
Magnetic Field ◽  
Axial Direction ◽  
Calibration System ◽  
Method Of Calculation ◽  
Helmholtz Coils ◽  
Magnetic Field Homogeneity ◽  
Different Types ◽  
Field Homogeneity ◽  
Magnetic Field Computation ◽  
The Magnetic Field

The article considers the calibration system computation with the inhomogeneity of magnetic field less than 0.1 %. Method of calculation is described. The numerical simulation using finite-element analyze was made for such system as: Helmholtz coils, improved Helmholtz coils, four and six coils system. Authors made the calculation of the magnetic field homogeneity toward axial direction. Based on procure results, authors analyzed magnetic field homogeneity and compared different types of coil systems.

Magnetic field homogeneity of a conical coaxial coil pair

2017 ◽  
Vol 88 (9) ◽  
pp. 095107 ◽  
Author(s):  
F. J. Salazar ◽  
F. J. Nieves ◽  
A. Bayón ◽  
F. Gascón
Keyword(s):  
Magnetic Field ◽  
Magnetic Field Homogeneity ◽  
Field Homogeneity
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