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Noise properties of a NMR transceiver coil array
Robert G Pinkerton1, Enzo A Barberi, Ravi S Menon
1Department of Medical Biophysics, University of Western Ontario, Ont., Canada.
Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 27, 2004
Summary
This study characterizes noise correlation in 50 Ohm radiofrequency (RF) coils for Magnetic Resonance Imaging (MRI). Results show decoupling with discrete components is feasible, enabling conventional amplifiers for advanced imaging techniques.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Radiofrequency (RF) Coil Technology
- Medical Physics
Background:
- Multiple radiofrequency (RF) surface coil elements are crucial for fast parallel and conventional MRI.
- Achieving 50 Ohm matching in transceive chains enables use of standard RF amplifiers.
- Noise correlation in 50 Ohm coils decoupled with discrete components remains uncharacterized.
Purpose of the Study:
- To characterize the noise correlation between 50 Ohm RF coils decoupled using discrete components.
- To evaluate the feasibility of using conventional amplifiers with decoupled 50 Ohm coils for MRI.
Main Methods:
- Implemented a magnetic decoupling network for 50 Ohm matching in RF transmitter and receiver chains.
- Measured coil quality factor (Q-factor) and noise correlation as a function of coil separation.
- Conducted measurements at 4 Tesla (170 MHz).
Main Results:
- Demonstrated that 50 Ohm matching is achievable using a simple magnetic decoupling network.
- Measured coil Q-factor and noise correlation showed consistency with theoretical predictions.
- Noise correlation dependence on coil separation was quantified.
Conclusions:
- A 50 Ohm coil system for NMR signal transmission and reception can be constructed.
- This system leverages benefits of conventional array coils and standard amplifiers.
- Discrete component decoupling offers a viable alternative for advanced MRI coil design.