About: Fast 3D radiofrequency field mapping using echo-planar imaging

Facets (new session)
Description
Metadata
Settings
- owl:sameAs
- Inference Rule:

About: Fast 3D radiofrequency field mapping using echo-planar imaging Goto Sponge NotDistinct Permalink

An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Nehomogenní radiofrekvemční pole (RF) je významným zdrojem chyb při kvantifikaci parametrů MR zpbrazování a MR spektroskopie.Pro korekce efektu nehomogenního RF v 3D datech je nutná znalost 3D rozložení RF ve vzorku. V tomto článku je navržena metoda na rychlé 3D mapování RF pole s použitím současného měření spinového a stimulovaného echa. Přesnost metody byla stanoven na 2 stupně (cs) An inhomogeneous radiofrequency (RF) magnetic field is an essential source of error for the quantification of MRI and MRS parameters. To correct for effects of RF inhomogeneities in 3D data sets, it is necessary to have knowledge of the 3D RF distribution in the sample. In this paper a method for fast 3D RF mapping is presented. The method is based on the simultaneous acquisition of a spin echo (SE) and a stimulated echo (STE) using echo-planar imaging (EPI). The acquisition of the 3D RF map using 64 partitions and TR = 500 ms requires 1.5 min. The use of the sequence in vivo is demonstrated by the calculation of the RF maps in the human brain at 3T. The comparison of calculated flip angles with the flip angles obtained by fitting signal behavior in the 3D stimulated-echo acquisition mode (STEAM)-EPI sequence and the analysis of errors due to spatially dependent T(1) values in the brain show that the accuracy of the calculated flip angles in the human brain is about 2 degrees. An inhomogeneous radiofrequency (RF) magnetic field is an essential source of error for the quantification of MRI and MRS parameters. To correct for effects of RF inhomogeneities in 3D data sets, it is necessary to have knowledge of the 3D RF distribution in the sample. In this paper a method for fast 3D RF mapping is presented. The method is based on the simultaneous acquisition of a spin echo (SE) and a stimulated echo (STE) using echo-planar imaging (EPI). The acquisition of the 3D RF map using 64 partitions and TR = 500 ms requires 1.5 min. The use of the sequence in vivo is demonstrated by the calculation of the RF maps in the human brain at 3T. The comparison of calculated flip angles with the flip angles obtained by fitting signal behavior in the 3D stimulated-echo acquisition mode (STEAM)-EPI sequence and the analysis of errors due to spatially dependent T(1) values in the brain show that the accuracy of the calculated flip angles in the human brain is about 2 degrees. (en)
Title	Fast 3D radiofrequency field mapping using echo-planar imaging Rychlé 3D mapování RF pole s použitím echo-planar imaging techniky (cs) Fast 3D radiofrequency field mapping using echo-planar imaging (en)
skos:prefLabel	Fast 3D radiofrequency field mapping using echo-planar imaging Rychlé 3D mapování RF pole s použitím echo-planar imaging techniky (cs) Fast 3D radiofrequency field mapping using echo-planar imaging (en)
skos:notation	RIV/00023001:_____/06:00000665!RIV07-MZ0-00023001
http://linked.open.../vavai/riv/strany	1375-1379
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(LC554), Z(MZ0IKEM2005)
http://linked.open...iv/cisloPeriodika	6
http://linked.open...vai/riv/dodaniDat	2007
http://linked.open...aciTvurceVysledku	Jírů, Filip
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Institut klinické a experimentální medicíny
http://linked.open...dnocenehoVysledku	475603
http://linked.open...ai/riv/idVysledku	RIV/00023001:_____/06:00000665
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	MR (en)
http://linked.open.../riv/klicoveSlovo	MR
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[5D98933D750F]
http://linked.open...i/riv/nazevZdroje	Magnetic resonance in medicine
http://linked.open...in/vavai/riv/obor	FH
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Neuroscience Centre
http://linked.open...UplatneniVysledku	2006
http://linked.open...v/svazekPeriodika	56
http://linked.open...iv/tvurceVysledku	Jírů, Filip Klose, Uwe
http://linked.open...n/vavai/riv/zamer	Výzkum kardiovaskulárních nemocí, diabetu a transplantace životně důležitých orgánů
issn	0740-3194
number of pages	5 (xsd:int)

Faceted Search & Find service v1.16.118 as of Jun 21 2024

Alternative Linked Data Documents: ODE Content Formats:

RDF

ODATA

Microdata

About

OpenLink Virtuoso version 07.20.3240 as of Jun 21 2024, on Linux (x86_64-pc-linux-gnu), Single-Server Edition (126 GB total memory, 48 GB memory in use)
Data on this page belongs to its respective rights holders.
Virtuoso Faceted Browser Copyright © 2009-2024 OpenLink Software