9.4T磁共振成像系统高通鸟笼射频线圈的研制
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摘要
设计并制作了一个发射/接收一体的鸟笼线圈,该线圈采用正交激发/接收,谐振频率可以达到400 MHz,在9.4T成像系统中,可对H原子成像。Workbench测试表明,该线圈Q值较高,两个通道的隔离度达到20 d B。进行了样品测试,结果显示图像均匀、信噪比高、对比清晰。该线圈设计工艺简单,成本较低,对于超高场磁共振成像射频线圈的设计与制作具有一定的借鉴意义。
Based on quadrature exciting and receiving technologies, a set of transmitting and receiving bird cage coil was designed and manufactured. The resonance can reach 400 MHz and imaging of atom H can also be attained on the 9. 4 T imaging system.The workbench test result indicated that the bird cage coil reached a high Q value and the isolation of the two channels was 20 d B. At the same time, the sample test was conducted whose results showed that the image was of high uniformity, image SNR and clearness. Featuring simple design process and low cost, the birdcage coil has the model significance to the design and manufactur-ing of RF coils in ultra-high magnetic field imaging.
Based on quadrature exciting and receiving technologies, a set of transmitting and receiving bird cage coil was designed and manufactured. The resonance can reach 400 MHz and imaging of atom H can also be attained on the 9. 4 T imaging system.The workbench test result indicated that the bird cage coil reached a high Q value and the isolation of the two channels was 20 d B. At the same time, the sample test was conducted whose results showed that the image was of high uniformity, image SNR and clearness. Featuring simple design process and low cost, the birdcage coil has the model significance to the design and manufactur-ing of RF coils in ultra-high magnetic field imaging.
引文
[1]赵喜平.磁共振成像系统的原理及其应用[M].北京:科学出版社,2000.
[2]张宏杰,宋枭禹,包尚联,等.磁共振成像射频线圈技术[J].中国医学影像技术,2005,21(9):1440-1441.
[3]ACKERMAN J J H.An historical introduction to surface coils:The EARLY DAYS[M].Encyclopedia of Magnetic Resonance,2012.
[4]VAUGHAN J T,HETHERINGTON H P,OTU J O,et al.High frequency volume coils for clinical NMR imaging and spectroscopy[J].Magnetic Resonance in Medicine,1994,32(2):206-218.
[5]HAYES C E,EDELSTEIN W A,SCHENCK J F,et al.An efficient,highly homogeneous radiofrequency coil for wholebody NMR imaging at 1.5 T[J].Journal of Magnetic Resonance,1985,63(3):622-628.
[6]CHEN C N,HOULT D I,SANK V J.Quadrature detection coils—A further姨2 improvement in sensitivity[J].Journal of Magnetic Resonance,1983,54(2):324-327.
[7]LEIFER M C.Resonant modes of the birdcage coil[J].Journal of Magnetic Resonance,1997,124(1):51-60.
[8]CHIN C,COLLINS C M,LI S,et al.Birdcage Builder:Design of specified-geometry birdcage coils with desired current pattern and resonant frequency[J].Concepts in Magnetic Resonance,2002,15(2):156-163.
[9]PETERSON D M,BECK B L,DUENSING G R,et al.Common mode signal rejection methods for MRI:Reduction of cable shield currents for high static magnetic field systems[J].Concepts in Magnetic Resonance Part B Magnetic Resonance Engineering,2003,19B(1):1-8.
[10]HAYES C E,EASH M G.Shield for decoupling RF and gradient coils in an NMR apparatus:US,US 4642569 A[P].1987.
[11]李永明,耿力东,俞集辉,等.多根贯通导线对屏蔽体内电路电磁干扰影响的仿真研究[J].电子技术应用,2007(11):133-135,138.
[2]张宏杰,宋枭禹,包尚联,等.磁共振成像射频线圈技术[J].中国医学影像技术,2005,21(9):1440-1441.
[3]ACKERMAN J J H.An historical introduction to surface coils:The EARLY DAYS[M].Encyclopedia of Magnetic Resonance,2012.
[4]VAUGHAN J T,HETHERINGTON H P,OTU J O,et al.High frequency volume coils for clinical NMR imaging and spectroscopy[J].Magnetic Resonance in Medicine,1994,32(2):206-218.
[5]HAYES C E,EDELSTEIN W A,SCHENCK J F,et al.An efficient,highly homogeneous radiofrequency coil for wholebody NMR imaging at 1.5 T[J].Journal of Magnetic Resonance,1985,63(3):622-628.
[6]CHEN C N,HOULT D I,SANK V J.Quadrature detection coils—A further姨2 improvement in sensitivity[J].Journal of Magnetic Resonance,1983,54(2):324-327.
[7]LEIFER M C.Resonant modes of the birdcage coil[J].Journal of Magnetic Resonance,1997,124(1):51-60.
[8]CHIN C,COLLINS C M,LI S,et al.Birdcage Builder:Design of specified-geometry birdcage coils with desired current pattern and resonant frequency[J].Concepts in Magnetic Resonance,2002,15(2):156-163.
[9]PETERSON D M,BECK B L,DUENSING G R,et al.Common mode signal rejection methods for MRI:Reduction of cable shield currents for high static magnetic field systems[J].Concepts in Magnetic Resonance Part B Magnetic Resonance Engineering,2003,19B(1):1-8.
[10]HAYES C E,EASH M G.Shield for decoupling RF and gradient coils in an NMR apparatus:US,US 4642569 A[P].1987.
[11]李永明,耿力东,俞集辉,等.多根贯通导线对屏蔽体内电路电磁干扰影响的仿真研究[J].电子技术应用,2007(11):133-135,138.