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Design and Test of Magnetic Wall Decoupling for Dipole Transmit/Receive Array for MR Imaging at the Ultrahigh Field of 7T
Yan XQ(燕新强); Yan, XQ; Wei L(魏龙); Zhang, XL; Wei, L; Xue, R
2015
发表期刊APPLIED MAGNETIC RESONANCE
卷号46期号:1页码:59-66
文章类型Article
摘要Radio-frequency coil arrays using dipole antenna technique have been recently applied for ultrahigh field magnetic resonance (MR) imaging to obtain the better signal-noise-ratio (SNR) gain at the deep area of human tissues. However, the unique structure of dipole antennas makes it challenging to achieve sufficient electromagnetic decoupling among the dipole antenna elements. Currently, there is no decoupling methods proposed for dipole antenna arrays in MR imaging. The recently developed magnetic wall (MW) or induced current elimination decoupling technique has demonstrated its feasibility and robustness in designing microstrip transmission line arrays, L/C loop arrays and monopole arrays. In this study, we aim to investigate the possibility and performance of MW decoupling technique in dipole arrays for MR imaging at the ultrahigh field of 7T. To achieve this goal, a two-channel MW decoupled dipole array was designed, constructed and analyzed experimentally through bench test and MR imaging. Electromagnetic isolation between the two dipole elements was improved from about -3.6 dB (without any decoupling treatments) to -16.5 dB by using the MW decoupling method. MR images acquired from a water phantom using the MW decoupled dipole array and the geometry factor maps were measured, calculated and compared with those acquired using the dipole array without decoupling treatments. The MW decoupled dipole array demonstrated well-defined image profiles from each element and had better geometry factor over the array without decoupling treatments. The experimental results indicate that the MW decoupling technique might be a promising solution to reducing the electromagnetic coupling of dipole arrays in ultrahigh field MRI, consequently improving their performance in SNR and parallel imaging.
学科领域Physics; Spectroscopy
DOI10.1007/s00723-014-0612-9
收录类别SCI
WOS类目Physics, Atomic, Molecular & Chemical ; Spectroscopy
WOS记录号WOS:000347883700006
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被引频次:11[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228185
专题核技术应用研究中心
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Yan XQ,Yan, XQ,Wei L,et al. Design and Test of Magnetic Wall Decoupling for Dipole Transmit/Receive Array for MR Imaging at the Ultrahigh Field of 7T[J]. APPLIED MAGNETIC RESONANCE,2015,46(1):59-66.
APA 燕新强,Yan, XQ,魏龙,Zhang, XL,Wei, L,&Xue, R.(2015).Design and Test of Magnetic Wall Decoupling for Dipole Transmit/Receive Array for MR Imaging at the Ultrahigh Field of 7T.APPLIED MAGNETIC RESONANCE,46(1),59-66.
MLA 燕新强,et al."Design and Test of Magnetic Wall Decoupling for Dipole Transmit/Receive Array for MR Imaging at the Ultrahigh Field of 7T".APPLIED MAGNETIC RESONANCE 46.1(2015):59-66.
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