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Determination of pre-emphasis constants for eddy current reduction
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SYSNO ASEP 0350811 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Determination of pre-emphasis constants for eddy current reduction Author(s) Bartušek, Karel (UPT-D) RID, ORCID, SAI
Kubásek, R. (CZ)
Fiala, P. (CZ)Number of authors 3 Source Title Measurement Science and Technology. - : Institute of Physics Publishing - ISSN 0957-0233
Roč. 21, č. 10 (2010), 105601:1-9Number of pages 9 s. Language eng - English Country GB - United Kingdom Keywords magnetic field gradient ; magnetic resonance imaging ; measurement technique Subject RIV JA - Electronics ; Optoelectronics, Electrical Engineering R&D Projects GA102/09/0314 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20650511 - UPT-D (2005-2011) UT WOS 000281787100042 EID SCOPUS 78149363774 DOI 10.1088/0957-0233/21/10/105601 Annotation Magnetic field gradients play a fundamental role in fast magnetic resonance imaging (MRI) methods and spectroscopy imaging. Precise information on gradient waveform shape and rise times is often very useful in experimental MRI. We present a simple method for the measurement of the gradient time course and static magnetic field changes. The method does not require any specialized hardware and can be used with a standard volume coil and a special phantom filled with deionized or doped water. The method is based on an analysis of the instantaneous frequency variation of an MR signal in the time domain, acquired from a mechanically selected thin slice of phantom located at the gradient isocentre. The measurement and approximation of the course of time gradients and of the changes in the static magnetic field result in pre-emphasis constants that substitute the constants determined manually in a time-consuming manner. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2011
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