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Title: Approximate Fourier Domain Expression for Bloch-Siegert Shift
Authors: Türk, Esra Abacı
İder, Yusuf Ziya
Ergün, Arif Şanlı
Atalar, Ergin
Keywords: B-1 mapping
Bloch-Siegert shift
magnetic resonance imaging
Issue Date: Jan-2015
Publisher: Wiley-Blackwell
Source: Turk, E. A., Ider, Y. Z., Ergun, A. S., & Atalar, E. (2015). Approximate Fourier domain expression for Bloch–Siegert shift. Magnetic resonance in medicine, 73(1), 117-125.
Abstract: PurposeIn this study, a new simple Fourier domain-based analytical expression for the Bloch-Siegert (BS) shift-based B-1 mapping method is proposed to obtain vertical bar b(1)(+)vertical bar more accurately while using short BS pulse durations and small off-resonance frequencies. Theory and MethodsA new simple analytical expression for the BS shift is derived by simplifying the Bloch equations. In this expression, the phase is calculated in terms of the Fourier transform of the radiofrequency pulse envelope, and thus making the off- and on-resonance effects more easily understandable. To verify the accuracy of the proposed expression, Bloch simulations and MR experiments are performed for the hard, Fermi, and Shinner-Le Roux pulse shapes. ResultsAnalyses of the BS phase shift-based B-1 mapping method in terms of radiofrequency pulse shape, pulse duration, and off-resonance frequency show that vertical bar b(1)(+)vertical bar can be obtained more accurately with the aid of this new expression. ConclusionsIn this study, a new simple frequency domain analytical expression is proposed for the BS shift. Using this expression, vertical bar b(1)(+)vertical bar values can be predicted from the phase data using the frequency spectrum of the radiofrequency pulse. This method works well even for short pulse durations and small offset frequencies. Magn Reson Med 73:117-125, 2015. (c) 2014 Wiley Periodicals, Inc.
ISSN: 0740-3194
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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