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The Effect of Coating Material of Copper-wire RF Coil on the Signal-to-Noise Ratio in MR Images
Journal of the Korean Society of Magnetic Resonance in Medicine ; : 171-176, 2009.
Article in Korean | WPRIM | ID: wpr-204156
ABSTRACT

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.
Subject(s)

Full text: Available Index: WPRIM (Western Pacific) Main subject: Polyesters / Polyurethanes / Copper / Signal-To-Noise Ratio Language: Korean Journal: Journal of the Korean Society of Magnetic Resonance in Medicine Year: 2009 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Polyesters / Polyurethanes / Copper / Signal-To-Noise Ratio Language: Korean Journal: Journal of the Korean Society of Magnetic Resonance in Medicine Year: 2009 Type: Article