Quadrature surface coil

A quadrature surface coil arrangement for use in the magnetic resonance (MR) examinations, said surface coil arrangement comprising:

• a first coil means for generating a circular field responsive to currents generated in the first coil means by FID signals in the MR system,
• second coil means proximate to the first coil means for producing a magnetic field aligned normal to the plane of the second coil means at the center of the second coil means responsive to the generation of current induced by said FID signals in the MR system,
• said first coil means comprising:
• a first outer, a second outer and a centrally located longitudinal conductor apart from and parallel to each other,
• a pair of parallel spaced-apart transverse conductors being connected to said first outer, second outer and centrally located longitudinal conductors to form a plurality of loops,
• means for tuning said first coil means,
• means for matching said first coil means,
• said second coil means comprising first and second spaced-apart longitudinal conductors,
• parallel, spaced-apart, transverse conductors connecting said first and second longitudinal conductors of said second coil means to form a single loop,
• means for tuning said second coil means, and
• means for matching said second coil means,
• isolating means in said first coil means and in said second coil means for isolating said first and second coil means from transmissions during radio frequency (RF) pulse transmission in said MR system,
• said isolating means comprising:
• pin diode means and
• means for connecting said pin diode means across said means for tuning said first coil means and said second coil means whereby when RF pulses are being transmitted in said MR system then the said means for tuning said first and second coil means are shorted out by said pin diode means.