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Fenomén nehomogenity materiálu v NMR
Fiala, P. ; Kroutilová, E. ; Steinbauer, M. ; Dohnal, P. ; Bartušek, Karel
This article deals with the verification of experimental results obtained by numerical simulation. We solved the effect of changes in the homogeneity of magnetic fields evoked by different samples from conductive and/or magnetic materials and the different types of inhomogeneity in the MR tomograph. Moreover, the paper will describe the suitable magnetic resonance techniques.
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Odstranění šumu vlnkovou filtrací ze signálu nukleární magnetické resonance
Kubásek, R. ; Geschneidtová, E. ; Bartušek, Karel
The wavelet transform is an up-to-date method for digital signal processing used in many branches of technology. One of its applications is the suppression of noise in useful signal. The paper deals with suppressing noise in a signal scanned on the NMR tomograph. The method of sub-band thresholding using the wavelet transform is discussed. This method is used in double denoising filtering of an FID signal and an instantaneous frequency signal. Using a filter bank with uniform ripple, designed by the Remez algorithm, is of advantage
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Odstranění šumu z NMR signálu pomocí sub-pásmového prahování vlnek
Kubásek, R. ; Steinbauer, M. ; Gescheidtová, E. ; Bartušek, Karel
The wavelet transform is an up-to-date method for digital signal processing used in many branches of technology. One of its applications is the suppression of noise in useful signal. The paper deals with suppressing noise in a signal scanned on the NMR tomograph. The method of sub-band thresholding using the wavelet transform is discussed. This method is used in double denoising filtering of an FID signal and an instantaneous frequency signal. Using a filter bank with uniform ripple, designed by the Remez algorithm, is of advantage
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