Abstract
A novel concept based on the use of higher-order harmonic resonances in a transmission-line resonator is introduced for the design of high-frequency RF coils at high and ultrahigh fields, where conventional RF coil designs present difficulties and limitations. To demonstrate this concept, we successfully designed and fabricated a 400-MHz RF coil for rat imaging using a second-harmonic resonant microstrip transmission line. This coil has a high Q-factor, reduces coil-cable interactions without the use of a matching balun, and has a broad range for tuning the coil's resonant frequency at the loaded condition. This work demonstrates that the use of higher-order harmonics in a transmission-line resonator provides an alternative, efficient approach to the design of large and high-frequency RF coils.
Original language | English (US) |
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Pages (from-to) | 1234-1239 |
Number of pages | 6 |
Journal | Magnetic resonance in medicine |
Volume | 53 |
Issue number | 5 |
DOIs | |
State | Published - May 2005 |
Keywords
- Brain
- High field
- Higher-order harmonic resonance
- MR imaging
- Microstrip transmission line
- RF coil