1. A method for maintaining encoded component coherence of nuclear magnetic moments in a material to be imaged in an inhomogeneous magnetic field when using a remotely positioned MRI device, which comprises the steps of: tilting said nuclear magnetic moments of said material with a 90.degree. pulse; encoding said tilted nuclei by imposing a gradient to said material, said gradient consisting of an x-gradient and a y-gradient; repetitively refocussing said tilted nuclear magnetic moments with a train of 180.degree. pulses, said train having a plurality of said 180.degree. pulses and a predetermined pulse repetition rate; and recording the magnetic moment measurements of said refocussed nuclei after each 180.degree. pulse in said train.