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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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Datensatz-Permalink: https://hdl.handle.net/11858/00-001M-0000-0027-8094-4 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0001-2CF6-9
Genre: Konferenzbeitrag

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externe Referenz:
http://www.sciencedirect.com/science/article/pii/S1474667016427977?np=y (Verlagsversion)
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 Urheber:
Chang, Y-C1, 2, Autor
Avdievich, N1, 2, Autor           
Henning, A1, 2, Autor           
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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 Zusammenfassung: 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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 Datum: 2014-08
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.3182/20140824-6-ZA-1003.01828
ISBN: 978-3-902823-62-5
BibTex Citekey: ChangAH2014
 Art des Abschluß: -

Veranstaltung

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Titel: 19th World Congress of the International Federation of Automatic Control (IFAC 2014)
Veranstaltungsort: Cape Town, South Africa
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Quelle 1

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Titel: IFAC Proceedings Volumes
Genre der Quelle: Zeitschrift
 Urheber:
Boje , E., Herausgeber
Xia, X, Herausgeber
Affiliations:
-
Ort, Verlag, Ausgabe: Oxford, UK : Pergamon Press
Seiten: - Band / Heft: 47 (3) Artikelnummer: - Start- / Endseite: 7517 - 7522 Identifikator: -