Suppression of Static Magnetic Field in Diffusion Measurements of Heterogeneous Materials

0336699 - ÚPT 2010 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Gescheidtová, E. - Bartušek, Karel
Suppression of Static Magnetic Field in Diffusion Measurements of Heterogeneous Materials.
PIERS 2009 Beijing: Progess in Electromagnetics Research Symposium - Proceedings. Cambridge: Electromagnetic Academy, 2009 - (Kong, J.), s. 1114-1118. ISBN 978-1-934142-08-0. ISSN 1559-9450.
[Progress in Electromagnetics Research Symposium 2009 Beijing. Beijing (CN), 23.04.2009-27.04.2009]
Grant CEP: GA ČR(CZ) GA102/07/0389
Výzkumný záměr: CEZ:AV0Z20650511
Klíčová slova: NMR-diffusion * simulated echo * background gradient suppression
Kód oboru RIV: JA - Elektronika a optoelektronika, elektrotechnika

The paper describes a magnetic resonance (MR) method for establishing the diffusion coefficients in heterogeneous materials. The pulsed field gradient stimulated-echo methods have a reduced coupling between the applied magnetic field gradient and a constant internal magnetic field gradient caused by different susceptibilities throughout the sample. When studying systems where it is necessary to keep the duration of the pulse sequence at a minimum or to study diffusion as a function of observation time, the spin-echo method should be chosen. The basic idea is to acquire the spin echo amplitude with pulsed field gradient of opposite signs and to subtract in a suitable way the NMR signals measured. The measuring method and the digital signal processing enable eliminating the effect of static magnetic field on the accuracy of measuring.
Trvalý link: http://hdl.handle.net/11104/0180881