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Updated: Jan 29, 2026
Noninvasive In Vivo Small Animal MRI and MRS: Basic Experimental Procedures
Published on: October 20, 2009
A dual 1H/19F birdcage coil for small animals at 7 T MRI
Palmira Villa-Valverde1,2, Ignacio Rodríguez3,4, Daniel Padró5
1Unidad de RMN, CAI Bioimagen Complutense, Universidad Complutense, Paseo Juan XXIII, 1, 28040, Madrid, Spain. palmira@ucm.es.
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.
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