Higher-order harmonic transmission-line RF coil design for MR applications
✍ Scribed by Xiaoliang Zhang; Xiao-Hong Zhu; Wei Chen
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 455 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
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. Magn Reson Med 53:1234–1239, 2005. © 2005 Wiley‐Liss, Inc.