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Transverse low-field RF coils in MRI
T Claasen-Vujcić1, H M Borsboom, H J Gaykema
1Spin Imaging Group, Faculty of Applied Physics, Delft University of Technology, The Netherlands.
Magnetic Resonance in Medicine
|July 1, 1996
Summary
Novel radiofrequency (RF) coils for low-field imaging enhance inductance and quality factor (Q) by using multi-turn designs and Litz wire, overcoming limitations of standard birdcage coils.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Radiofrequency (RF) Engineering
- Coil Design
Background:
- Low-field MRI requires RF coils with high quality factor (Q) and inductance due to dominant coil losses and low frequencies.
- Standard birdcage coils have limited inductance due to their strip configuration.
- Increasing capacitance for matching is complex and costly.
Purpose of the Study:
- To present novel transverse RF coil designs for low-field MRI.
- To improve inductance and Q factor beyond conventional birdcage coils.
- To compare the performance of new coil designs against standard coils.
Main Methods:
- Abandoning strip inductors in favor of multi-turn designs for higher inductance.
- Utilizing Litz wire to further enhance the Q factor.
- Designing and comparing three novel transverse RF coils in linear and quadrature modes.
Main Results:
- The novel multi-turn designs achieve significantly higher inductance compared to standard coils.
- Litz wire integration further boosts the Q factor.
- Performance comparison demonstrates advantages of the new designs for low-field applications.
Conclusions:
- Novel multi-turn RF coil designs effectively address the inductance limitations of standard low-field MRI coils.
- These designs, particularly with Litz wire, offer improved Q factors for enhanced imaging performance.
- The presented coils provide viable alternatives for low-field MRI applications.