NDLI: RF multi-channel head coil design with improved $B^{+}$ Fields uniformity for high field MRI systems

Content Provider	IEEE Xplore Digital Library
Author	Sung-Min Sohn DelaBarre, Lance Vaughan, John Thomas Gopinath, Anand
Copyright Year	2012
Description	Author affiliation: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, 55408, United States (DelaBarre, Lance) \|\| Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, 55455, United States (Sung-Min Sohn; Vaughan, John Thomas; Gopinath, Anand)
Abstract	In ultra high field MRI systems (7 tesla and higher), the wavelength inside the body is short and smaller than the human anatomy at the Larmor frequency. At these shorter wavelengths, interference effects appear; the uniformity of the RF excitation $B^{+}$ field over the whole subject becomes inhomogeneous. The RF $B^{+}$ field generated by the RF coil is a maximum in the center along the length of the coil microstrip element and falls off towards both ends of the coil element and it leads to anomalous contrast in the MR images. In this study, double trapezoid-like shape along the length of the microstrip resonator is proposed to obtain gradual impedance variation and flatten transmission near-field profile along the length of the coil. The conventional and proposed 8 channel head coils were investigated with a phantom in a 7 tesla MRI scanner. The results show very flat field distribution with about 35% increased local transmission magnetic field strengths at the end sides as well as about 13% improvement at the center and the Q (quality factor) ratio between unloaded and loaded is also increased about 45% (from 1.46 to 2.13) compared to the conventional structure.
Starting Page	1
Ending Page	3
File Size	1008207
Page Count	3
File Format	PDF
ISBN	9781467310857
ISSN	0149645X
e-ISBN	9781467310888
e-ISBN	9781467310864
DOI	10.1109/MWSYM.2012.6259669
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-17
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Magnetic resonance imaging Radio frequency Conductors Microstrip Power transmission lines Shape RF shimming Microstrip antennas Magnetic resonance imaging (MRI) RF coils
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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