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Statements

Subject Item
n2:RIV%2F00216305%3A26220%2F06%3APU61629%21RIV07-MSM-26220___
rdf:type
skos:Concept n15:Vysledek
dcterms:description
Zobrazovací techniky pracující na bázi magnetické resonance mohou být využity pro studium transportních dějů v biologických systémech pomocí difúzních procesů. Přesné určení difúzních konstant závisí na přesnosti gradientních pulsů. Pro určení časových charakteristik gradientních pulsů byla vyvinuta a experimentálně ověřena měřicí metoda. Ta je založena na měření okamžité frekvence MR signálu za přítomnosti gradientního pulsu po excitaci tenké vrstvy vyšetřovaného vzorku v poloze mimo střed gradientu. Touto metodou byly zjištěny chyby v amplitudě a integrálu gradieního pulsu a při stanovení difúzního koeficientu v biologických tkáních. Imaging techniques based on the principle of nuclear magnetic resonance (MRI) can be used in the study of molecular transport phenomena in biological systems such as self-diffusion processes. The precision of determining the diffusion constants depends on generating the gradient pulse with high precision. For the purpose of determining the characteristics of time behaviour of gradient pulses a simple measuring method was developed and experimentally tested on a 4.7 T tomograph. The method is based on the principle of measuring the instantaneous frequency of MR signal in the presence of gradient pulse after the excitation of a thin defined layer of the examined specimen placed outside the gradient field centre. Using the above method, errors were found in the amplitude and time integral of generated gradient fields and in determining the diffusion constants for biological tissues. Imaging techniques based on the principle of nuclear magnetic resonance (MRI) can be used in the study of molecular transport phenomena in biological systems such as self-diffusion processes. The precision of determining the diffusion constants depends on generating the gradient pulse with high precision. For the purpose of determining the characteristics of time behaviour of gradient pulses a simple measuring method was developed and experimentally tested on a 4.7 T tomograph. The method is based on the principle of measuring the instantaneous frequency of MR signal in the presence of gradient pulse after the excitation of a thin defined layer of the examined specimen placed outside the gradient field centre. Using the above method, errors were found in the amplitude and time integral of generated gradient fields and in determining the diffusion constants for biological tissues.
dcterms:title
Checking the quality of gradient magnetic fields Checking the quality of gradient magnetic fields Kontrola kvality gradientních magnetických polí
skos:prefLabel
Checking the quality of gradient magnetic fields Kontrola kvality gradientních magnetických polí Checking the quality of gradient magnetic fields
skos:notation
RIV/00216305:26220/06:PU61629!RIV07-MSM-26220___
n4:strany
207-210
n4:aktivita
n21:Z
n4:aktivity
Z(AV0Z20650511), Z(MSM0021630513)
n4:dodaniDat
n5:2007
n4:domaciTvurceVysledku
n6:4095499 n6:6157165 n6:5918367
n4:druhVysledku
n9:D
n4:duvernostUdaju
n20:S
n4:entitaPredkladatele
n11:predkladatel
n4:idSjednocenehoVysledku
468494
n4:idVysledku
RIV/00216305:26220/06:PU61629
n4:jazykVysledku
n7:eng
n4:klicovaSlova
gradient magnetic field, magnetic resonance
n4:klicoveSlovo
n14:magnetic%20resonance n14:gradient%20magnetic%20field
n4:kontrolniKodProRIV
[02F024A903EA]
n4:mistoKonaniAkce
Gliwice-Ustroń, Polsko
n4:mistoVydani
Gliwice-Ustron
n4:nazevZdroje
INTERNATIONAL CONFERENCE ON FUNDAMENTALS OF ELECTROTECHNICS AND CIRCUIT THEORY 2006
n4:obor
n13:JA
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
3
n4:rokUplatneniVysledku
n5:2006
n4:tvurceVysledku
Bartušek, Karel Gescheidtová, Eva Kubásek, Radek
n4:typAkce
n19:WRD
n4:zahajeniAkce
2006-05-24+02:00
n4:zamer
n18:MSM0021630513 n18:AV0Z20650511
s:numberOfPages
4
n12:hasPublisher
Silesian University of Technology
n16:isbn
83-85940-28-6
n8:organizacniJednotka
26220