Patent ID: 6297636
Filing Date: 2001-10-02
Classification: G01R

Abstract:
An RF coil apparatus comprising:a pair of planar coil devices disposed parallel to each other and forming a space therebetween for placement of a subject, said space having an area for an RF magnetic field, each of said devices comprising:a first annular electric path having a first diameter;a plurality of radially extending electric paths, each having two ends, and each being connected at one end to said first annular electric path, said plurality of radially extending electric paths providing a main RF magnetic field in said area of said space, anda second annular electric path having a second diameter larger than said first diameter and connected to other ends of said plurality of radially extending electric paths, said second annular electric path being disposed a distance from said area at which said main RF magnetic field is provided; andRF signal supply means for supplying at least two separate RF signals to said second annular electric path at positions which are 90.degree. from each other, wherebyRF magnetic field produced by said second annular electric path has a reduced cancellation effect on said main RF magnetic field provided by said plurality of radially extending electric paths in said area of said space.