Mapping of magnetic field around small coils using the magnetic resonance method

Bartušek, K.; Dokoupil, Z.; Gescheidtová, E.

doi:10.1088/0957-0233/18/7/056

Cited by 17 publications

(12 citation statements)

References 17 publications

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“…This method is very sensitive to inhomogeneities of the static magnetic field and this can be useful for susceptibility measurement [12]. Because the reaction field is generated proportionally to material susceptibility, it is possible to use the GE method for its measurement [13]. The GE sequence depicted in Fig.…”

Section: Methods Of Mri Measurementmentioning

confidence: 99%

Multiparametric data collection of animal tissues in magnetic resonance imaging

Marcoň

Bartušek

2012

2012 35th International Conference on Telecommunications and Signal Processing (TSP)

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In this article a magnetic resonance multiparametric data collection is described. The spin echo and the gradient echo sequences for magnetic resonance measurement were used. Images obtained by a nuclear magnetic resonance tomographare proton density, longitudinal relaxation time T 1 , transversal relaxation time T 2 and magnetic susceptibility weighted. As a measured sample chicken wing was used. Several parameters as a maximal value, minimal value, mean value and standard deviation were evaluated in skin, fat, muscle, bone and bone marrow tissues. Obtained data could be used for multiparametric analysis and for image segmentation.

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Section: Methods Of Mri Measurementmentioning

confidence: 99%

Multiparametric data collection of animal tissues in magnetic resonance imaging

Marcoň

Bartušek

2012

2012 35th International Conference on Telecommunications and Signal Processing (TSP)

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“…Many authors studied arrangements of coils to improve the resulting sensitivity [7], [8]. Authors [9]- [11] present different experiments based on the NMR technique. Some articles solve technical problems of the NMR instrumentation, e.g.…”

Section: Introductionmentioning

confidence: 99%

Analysis of NMR Signal for Static Magnetic Field Standard

Andris

Dermek

Gogola

et al. 2022

Measurement Science Review

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This article describes the analysis of the NMR (Nuclear Magnetic Resonance) stabilizer signal. Magnetic field of the standard is created using an electromagnet. Sufficiently high stability of the magnetic field is achieved with the help of a stabilizer with an NMR probe. The NMR phenomenon makes possible very accurate measurements of the static magnetic field, but the resulting stability depends also on supporting electronics. An analysis has been done and tolerances of the measured quantities have been estimated. The calculated tolerances indicate the needed features of the material. First the probe excites the FID (Free Induction Decay) signal in the water sample and acquires the signal answer. It is Fourier transformed and its spectrum is investigated. The actual magnetic field corresponds to the strongest frequency sample. It is utilized for the magnetic field strength correction and stabilization of it. The article brings many equations for such calculation.

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“…Signal processing and noise matching have been used to optimise NMR results [9][10][11][12][13][14][15], although optimisation must be carried out in a manner specific to the particular experiment.…”

Section: Introductionmentioning

confidence: 99%

Analysis of NMR Spectrometer Receiver Noise Figure

Andris

Emery²,

Frollo

2019

Mathematical Problems in Engineering

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This article describes the measurement and evaluation of the system noise figure of a nuclear magnetic resonance spectrometer. A method was used which involved the console of the spectrometer, calibrated for real voltage (in volts), and used for noise signal digitisation and measurement. The resulting digitised signal was exported and processed, and the root mean square value calculated. This value was utilised for the noise power calculation, which was compared with the theoretical value and the noise figure calculated. The method presented enables analysis of the bandwidth of the noise. Many of the equations that are commonly used for signal processing have been derived for the specific task and require verification. We have verified the technique using a commercial console with two preamplifier pairs. The experimental data agree well with the theoretical values, confirming that the presented method is a valid, simple, and fast tool for the inspection of the spectrometer receiver.

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Mapping of magnetic field around small coils using the magnetic resonance method

Cited by 17 publications

References 17 publications

Multiparametric data collection of animal tissues in magnetic resonance imaging

Multiparametric data collection of animal tissues in magnetic resonance imaging

Analysis of NMR Signal for Static Magnetic Field Standard

Analysis of NMR Spectrometer Receiver Noise Figure

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