shifting gradient the axis of which is perpendicular to a reading gradient with a constant direction for example for a cross section the reading gradient could be the gradient x and the phase shifting gradient could be the gradient y the image is reconstructed through a two dimensional fourier transform whence the name of the method although the invention is described herein with a 2dft type imaging method it is nonetheless applicable to other imaging methods especially methods of the 3dft type which are deduced from the above method by generalization in the case of the invention the radiofrequency excitations are of the ssfp type they are shown in fig2 a this figure shows a typical representation of the excitation pulses and signals corresponding to nmr in response to these excitations in an ssfp type of method the dynamic equilibrium of the longitudinal magnetization m z and the transversal magnetization m xy was got for excitations e which cause the orientation of the magnetic moments of the particles in a body to flip by an angle u03b1 pre determined by the spin lattice relaxation time t 1 of the body 39 s particles on the one hand and by the repetition time tr between different excitations on the other hand if the angle u03b1 is accurately adjusted the presence of two nmr signals s is noted a first free precession signal 10 and a second so called rising signal 11 in one sequence the signal 11 is presented just before the application of an excitation pulse 12 of a following sequence the signal 11 is weaker than the signal 10 firstly because of the combined effects of the non homogeneity of the orienting field b o and secondly.