1. An imaging apparatus for producing Magnetic Resonance (MR) images of a subject, the apparatus comprising: a magnet assembly for producing a static magnetic field; a gradient coil assembly for generating a magnetic field gradient for use in producing MR images; at least one radiofrequency (rf) coil assembly for transmitting a radiofrequency pulse and for detecting a plurality of magnetic resonance (MR) signals induced from the subject; a positioning device for supporting the subject and for translating the subject into the magnet assembly; and, a plurality of receivers for receiving the plurality of MR signals, the receivers each being adapted to be adjusted in at least one of phase and frequency in response to translation of the positioning device.