A technique of double-resonant operation of 19F and 1H quadrature birdcage coils.
A technique was developed to change the resonant frequency of a rotating field birdcage coil from 19F resonance (76.14 MHz) to 1H resonance (80.92 MHz). This was done by inserting an additional shield with a smaller radius on the coil which resonates at 19F. It was shown that the inhomogeneity introduced by reducing the shield radius is not significant. A working coil built with this technique produced both 19F and 1H images satisfactorily.
Lu
D F
DF
Department of Radiology, University of Pennsylvania, Philadelphia 19104.
Joseph
P M
PM
D006801:Humans; D008279:Magnetic Resonance Imaging / Q000295:instrumentation* / Q000379:methods; D008961:Models, Structural