Anzeige
Erschienen in:
16.02.2019 | Research Article
A dual 1H/19F birdcage coil for small animals at 7 T MRI
Erschienen in: Magnetic Resonance Materials in Physics, Biology and Medicine | Ausgabe 1/2019
Einloggen, um Zugang zu erhaltenAbstract
Objective
Given the growing interest in fluorine, it is necessary to develop new multi-tuned RF coils. Therefore, our objective is to design a simple and versatile double-tuned RF coil that can be used as a transmitter and receiver double-tuned coil (1H and 19F) or as transmitter-only double-tuned coil.
Materials and methods
A high-pass eight-element birdcage coil was built for 1H and 19F for a 7 T scanner. PIN diodes and cable traps to block unwanted common mode currents in cables were introduced to confer more flexibility to the coil. S-parameters and quality factor were measured in workbench and signal to noise ratio as well as signal intensity profiles in imaging experiments.
Results
Bench measurements show S11 values less than − 33 dB, S21 lower than − 13 dB and quality factors ratio of the order of 1.8 that are in agreement with good performances of a RF coil, as well as values of − 39 dB for 19F and − 30 dB for 1H as good detuning values. Signal intensity profiles prove excellent homogeneity at 1H and 19F.
Discussion
We present a simple structure of a double-tuned high-pass birdcage coil tuned to 1H and 19F that shows a great uniformity and sensitivity for 19F.