Fast 3D radiofrequency field mapping using echo-planar imaging

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023001%3A_____%2F06%3A00000665" target="_blank" >RIV/00023001:_____/06:00000665 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Fast 3D radiofrequency field mapping using echo-planar imaging

Original language description

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.

Czech name

Rychlé 3D mapování RF pole s použitím echo-planar imaging techniky

Czech 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 narychlé 3D mapování RF pole s použitím současného měření spinového a stimulovaného echa. Přesnost metody byla stanoven na 2 stupně

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

FH - Neurology, neuro-surgery, nuero-sciences

OECD FORD branch

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Project

<a href="/en/project/LC554" target="_blank" >LC554: Neuroscience Centre</a><br>

Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2006

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Magnetic resonance in medicine

ISSN

0740-3194

e-ISSN

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Volume of the periodical

56

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

5

Pages from-to

1375-1379

UT code for WoS article

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EID of the result in the Scopus database

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