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  System Identification and Signal Processing for PID Control of B0 Shim Systems in Ultra-High Field Magnetic Resonance Applications

Chang, Y.-C., Avdievich, N., & Henning, A. (2014). System Identification and Signal Processing for PID Control of B0 Shim Systems in Ultra-High Field Magnetic Resonance Applications. IFAC Proceedings Volumes, 47(3), 7517-7522.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-8094-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-2CF6-9
Genre: Conference Paper

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 Creators:
Chang, Y-C1, 2, Author
Avdievich, N1, 2, Author              
Henning, A1, 2, Author              
Affiliations:
1Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_2528692              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Magnetic resonance (MR) scanners are important tools in medical diagnostics and in many areas of neuroscience. MR technology is moving towards ultra-high field (UHF) 7T and 9.4Tscanners which provide more signal intensity. However, they also suffer from inhomogeneity of the static magnetic field (B0 field) which can lead to artifacts and uninterpretable data. B0 shimming is a technique used to reduce inhomogeneities but MR scanners use a constant shim setting for a duration of the experiment. Dynamic shim updating (DSU) updates the shim in real-time while the scan is in process and can hence reduce any fluctuations in B0 field which may arise due to patient breathing, mechanical vibrations and soforth. However, DSU is currently very slow and if we want to increase the update rate, control theory needs to be applied. This paper presents an application of basic system identification and signal processing in the context of MR systems for DSU. Although system identification of these systems has been done before, they are non-parametric frequency domain approaches. These systems can be modelled as linear multivariable systems.

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 Dates: 2014-08
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.3182/20140824-6-ZA-1003.01828
ISBN: 978-3-902823-62-5
BibTex Citekey: ChangAH2014
 Degree: -

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Title: 19th World Congress of the International Federation of Automatic Control (IFAC 2014)
Place of Event: Cape Town, South Africa
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Title: IFAC Proceedings Volumes
Source Genre: Journal
 Creator(s):
Boje , E., Editor
Xia, X, Editor
Affiliations:
-
Publ. Info: Oxford, UK : Pergamon Press
Pages: - Volume / Issue: 47 (3) Sequence Number: - Start / End Page: 7517 - 7522 Identifier: -