Equivalent magnetization current method applied to the design of gradient coils for magnetic resonance imaging

Sanchez Lopez, Hector, Liu, Feng, Poole, Michael and Crozier, Stuart (2009). Equivalent magnetization current method applied to the design of gradient coils for magnetic resonance imaging. In: , , (767-775). . doi:10.1109/TMAG.2008.2010053


Author Sanchez Lopez, Hector
Liu, Feng
Poole, Michael
Crozier, Stuart
Title of paper Equivalent magnetization current method applied to the design of gradient coils for magnetic resonance imaging
Journal name IEEE Transactions on Magnetics   Check publisher's open access policy
Publication Year 2009
Sub-type Fully published paper
DOI 10.1109/TMAG.2008.2010053
Open Access Status Not yet assessed
ISSN 0018-9464
Volume 45
Issue 2
Start page 767
End page 775
Total pages 9
Language eng
Abstract/Summary A new method is described for the design of gradient coils for magnetic resonance imaging systems. The method is based on the known equivalence between a magnetized volume surrounded by a conducting surface and its equivalent representation by a surface current density. The curl of a vertical magnetization vector of a magnetized thin volume is equivalent to a surface current density whose stream line defines a coil current pattern. This concept is applied to the design of gradient coils of arbitrary shape. The thin magnetized volume is discretized in small triangular elements. By calculating the contribution of each magnetized block at target points a field source matrix is obtained. The equivalent magnetization current concept is applied to obtain the equivalent coil impedance, force and torques. A quadratic programming optimization algorithm is used to obtain the stream-magnetization-thickness function value at each node such that coils of optimal performance are obtained. This method can be used for gradient coils wound on arbitrary surface shapes and can be applied to hybrid current/iron solutions. A variety of examples are shown to demonstrate the versatility of the method. A novel partially shielded 3-D biplanar gradient coil for open MRI magnets is presented.
Subjects 2208 Electrical and Electronic Engineering
2504 Electronic, Optical and Magnetic Materials
Keyword Biplanar gradient coil design
Magnetic resonance imaging (MRI)
Three-dimensional gradient coil structure
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Sub-type: Fully published paper
Collection: Scopus Import - Archived
 
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Created: Fri, 22 Dec 2017, 20:05:46 EST