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KMID : 0858520090130020171
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Journal of the Korean Society of Magnetic Resonance in Medicine
2009 Volume.13 No. 2 p.171 ~ p.176
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The Effect of Coating Material of Copper-wire RF Coil on the Signal-to-Noise Ratio in MR Images
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Lee Hyeon-Seung
Chang Yong-Min
Moon Hye-Young
Hong Kwan-Soo
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Abstract
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Purpose : To investigate the effect of coating material in RF coil, which is one of main parts in MRI machine, on the Q-factor and SNR(signal-to-noise ratio) in MR images.
Materials and Methods : RF coils with inner diameter of 1.7 mm were made by using copper wires coated with polyester, polyurethane, polyimide, polyamideimide, and polyester-imide, and by using copper wires in which coating materials had been removed. Q-factors of the RF coils were measured by network analyzer, and SNR values in the spin-echo MR images obtained by 600 MHz (14.1 T, Bruker DMX600) micro-imaging system for the coated and uncoated cases.
Results : The measured SNRs were almost same for the RF coils with coat-removed copper wires, however SNRs and Q-factors were different for the coated cases depending on the coating material. They were maximized in the polyurethane-coated case in which the SNR was > 30% greater than polyester-coated case.
Conclusion : We made solenoid-type RF coils which were easily used for MR micro-imaging in Bruker MRI probe. There was a significant coating-material dependence in the measured Q values and SNRs for the home-made RF coils. The study demonstrated that the choice of coating material of RF coil may be a critical factor in the MRI sensitivity based on SNR value.
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KEYWORD
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MRI, RF coil, Coating material, SNR
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