Reproducible and highly miniaturized bazooka RF Balun using a printed capacitor

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Radio Frequency (RF) Engineering
• Electrical Engineering

Background:

• High-density, lightweight, and flexible RF coils are crucial for modern MRI.
• Baluns are essential components for RF coil functionality and sensitivity.
• Miniaturization of baluns is key for advanced coil designs.

Purpose of the Study:

• To develop and apply reproducible, highly miniaturized baluns for RF coil design.
• To explore the use of printed coaxial capacitors for balun fabrication.
• To assess the performance of miniaturized baluns in various MRI field strengths.

Main Methods:

• Introduction of a novel approach using printed coaxial capacitors for Bazooka baluns.
• Electromagnetic simulations and hardware fabrication for design validation.
• Testing across 1.5T, 3T, and 7T MRI systems.

Main Results:

• The proposed balun achieves acceptable common-mode rejection ratio despite miniaturization.
• Printed capacitors significantly reduce balun length and ensure high reproducibility.
• No RF field distortion observed, making it suitable for flexible, wearable, and high-density coils in high-field MRI.

Conclusions:

• The manufacturing process of printed coaxial capacitors ensures simple fabrication and production consistency.
• Advancements enable the development of next-generation flexible, wearable, and high-density RF coils.
• This work supports the trend towards more sophisticated and adaptable MRI coil technology.