A multiply-tuned volume resonator comprises a generally cylindrical
birdcage comprising a pair of end rings and generally parallel column
elements bridging the end rings at generally equal circumferentially
spaced locations. The column elements carry at least two distinct-valued,
alternating impedance components. A plurality of capacitors is disposed
on the end rings. Each capacitor is positioned between a pair of adjacent
column elements. The capacitors on the end rings are tuned to the
resonant frequency associated with a low frequency paramagnetic nuclei
and the impedance components on the column elements are tuned to the
resonant frequency associated with at least one high frequency
paramagnetic nuclei. Direct drives are provided for high frequency and
low frequency sections of the volume resonator.