磁共振六通道线圈阵列的数字化仿真与设计

doi:10.3969/j.issn.0258-8021.2017.06.011

Abstract
Figure/Table
References
Related Citation (3)

Download: PDF (2827 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract The multi-channel array coil has been widely applied in MRI to improve the quality of images in recent years. Aimed at optimizing the radio frequency (RF) field in the local region of interest (ROI), we proposed a model of a 6-channel array coil consisting of elements of different dimensions, which was proved to be able to optimize the RF field in the local region of interest in the pelvic cavity. The model was made up of coils with two different widths (10 cm and 20 cm). In this paper, geometry overlapping and capacitive network methods were adopted to decouple coils, and the finite difference time domain (FDTD) method was applied to simulation and calculation. The RF field in ROI produced by the proposed array coil was analyzed and evaluated. The simulation results showed that the decoupling levels S₁₂ and S₁₃ of the proposed array coil combined with the elliptic cylinder electromagnetic model were -27.19 dB and -33.46 dB, respectively. Additionally, the RF field B⁺₁ mean value in ROI was approximately 5.21% larger than a conventional array coil made up of same elements with width of 15 cm. In conclusion, the array coil made up of elements with different dimensions improved the RF field in ROI, thereby providing inspiration for the design of RF coils for MRI.

Key words： array coil decoupling electromagnetic model finite difference time domain(FDTD) method RF field

Received: 30 September 2016

PACS:

R318

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	Li Huayong
	Cao Shuangliang
	Wang Peipei
	Chen Meiling
	Lu Lijun
	Chen Wufan

Cite this article:

Li Huayong,Cao Shuangliang,Wang Peipei, et al. The Numerical Simulation and Design of a 6-Channel Array Coil for MRI[J]. Chinese Journal of Biomedical Engineering, 2017, 36(6): 711-717.

URL:

http://cjbme.csbme.org/EN/10.3969/j.issn.0258-8021.2017.06.011 OR http://cjbme.csbme.org/EN/Y2017/V36/I6/711

[1] Roemer PB, Edelstein WA, Hayes CE, et al. NMR phased array [J]. Magnetic Resonance in Medicine, 1990, 16(2):192-225.
[2] Lee RF, Giaquinto RO, Hardy CJ. Coupling and decoupling theory and its application to the MRI phased array [J]. Magnetic Resonance in Medicine, 2002, 48(1):203-213.
[3] Reykowski A, Steven MWPD, Porter JR. Design of matching networks for low noise preamplifiers [J]. Magnetic Resonance in Medicine, 1995, 33(6):848-852.
[4] Guclu CC, Boskamp E, Zheng TH, et al. A method for preamplifier-decoupling improvement in quadrature phased-array coil [J]. Journal of Magnetic Resonance Imaging, 2004, 19(2):255-258.
[5] Zhang Xiaozhong, Webb A. Design of a capacitively decoupled transmit/receive NMR phased array for high field microscopy at 14.1T [J]. Journal of Magnetic Resonance, 2004, 170(1):149-155.
[6] Rengle A, Armenean M, Bolbos R, et al. A dedicated two-channel phased-array receiver coil for high-resolution MRI of the rat knee cartilage at 7 T [J]. IEEE Transactions on Bio-medical Engineering, 2009, 56(12):2891-2897.
[7] Perrier AL, Grenier D, Ravel N, et al. Capacitive approach to restore decoupling between channels for four-element MR coil array [J]. Electronics Letters, 2013, 49(13):815-816.
[8] Bing KL, Hua W, Trakic A, et al. An orthogonal-based decoupling method for MRI phased array coil design [J]. NMR in Biomedicine, 2012, 25(6):835-842.
[9] Giulio G, Valentina H, Vittorio V, et al. Low field elliptical MR coil array designed by FDTD [J]. Concepts in Magnetic Resonance Part B Magnetic Resonance Engineering, 2008, 33B(1):32-38.
[10] 黄绮华, 高勇, 辛学刚. 高场和超高场MR下人体内B_1场均匀性及SAR随场强变化规律的研究[J]. 中国生物医学工程学报, 2013, 32(1):21-27.
[11] 辛学刚, 韩继钧, 陈武凡. FDTD方法在磁共振射频线圈仿真中的应用[J]. 电路与系统学报, 2010, 15(4):133-136.
[12] Hartwig V, Vivoli G, Tassano S, et al. Decoupling and shielding numerical optimization of MRI phased-array coils [J]. Measurement, 2016, 82:450-460.
[13] Giovannetti G, Frijia F, Hartwig V, et al. A novel magnetic resonance phased-array coil designed with FDTD algorithm [J]. Applied Magnetic Resonance, 2010, 39(3):225-231.
[14] Kim J, Krishnamurthy N, Santini T, et al. Experimental and numerical analysis of B1(+) field and SAR with a new transmit array design for 7T breast MRI [J]. Journal of Magnetic Resonance, 2016, 269:55-64.
[15] While PT, Forbes LK, Crozier S. An inverse method for designing RF phased array coils in MRI—theoretical considerations [J]. Measurement Science & Technology, 2007, 18(1):245-259.
[16] Gabriel C. Compilation of the dielectric properties of body tissues at F and microwave frequencies [R]. N.AL/OE-TR-1996-0037, 1996.
[17] Christ A, Kainz W, Hahn EG, et al. The virtual family—development of surface-based anatomical models of two adults and two children for dosimetric simulations [J]. Phys Med Biol, 2010, 55(2):N23-N38.
[18] Balidemaj E, Astrid LHMW, Crezee H, et al. Feasibility of Electric Property Tomography of pelvic tumors at 3T[J]. Magnetic Resonance in Medicine, 2015, 73(4):1505-1513.
[19] 张雪雷,邹贵弘,房震,等. 磁共振成像相控阵射频线圈电磁去耦方法的研究[J]. 低温与超导, 2015, 43(2):1-4.
[20] 李磊, 徐俊成, 蔡昕, 等. 猕猴脑部多通道接收线圈的仿真与设计[J]. 磁共振成像, 2016, 7(6): 449-453.
[21] Mogatadakala KV, Bankson JA, Narayana PA. Three-element phased-array coil for imaging of rat spinal cord at 7T [J]. Magnetic Resonance in Medicine, 2008, 60(6):1498-1505.
[22] Pierre‐François VDM, Akgun C, Adriany G, et al. B1 destructive interferences and spatial phase patterns at 7 T with a head transceiver array coil [J]. Magnetic Resonance in Medicine, 2005, 54(6):1503-1518.
[23] Axel L, Hayes C. Surface coil magnetic resonance imaging [J]. Archives Internationales de Physiologie, 1985, 8(5):381-384.
[24] Son HW, Cho YK, Yoo H. A novel RF resonator for human-body MRI at 3 T [J]. Journal of the Korean Physical Society, 2014, 64(6):813-816.
[25] Vaidya MV, Collins CM, Sodickson DK, et al. Dependence of B1- and B1+ field patterns of surface coils on the electrical properties of the sample and the MR operating frequency [J]. Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering, 2016, 46(1):25-40.
[26] Hoult DI. The principle of reciprocity in signal strength calculations-A mathematical guide [J]. Concepts in Magnetic Resonance, 2000, 12(4):173-187.
[27] Yoo H, Gopinath A, Vaughan JT. A method to localize RF B₁ field in high-field magnetic resonance imaging systems [J]. IEEE Transactions on Biomedical Engineering, 2012, 59(12):3365-3371.
[28] Son HW, Cho YK, Yoo H. A novel RF resonator using microstrip transmission line for human body MRI at 3T[C]// Proceedings of the International Symposium on Antennas & Propagation. Nanjing: IEEE, 2014:1141-1144.
[29] Keil B, Wald LL. Massively parallel MRI detector arrays [J]. Journal of Magnetic Resonance, 2013, 229(2):75-89.