Rotating frame zeugmatography

Abstract A new method of obtaining NMR images is described which retains the inherent sensitivity of the two-dimensional Fourier transform while obviating the need for any changes of field gradient. The conditions applied in the laboratory frame, viz., a homogeneous field plus a field gradient, are also applied in the rotating frame so that the flip angle due to a pulse of length τ is dependent upon position x . The amplitude of the received signal is therefore dependent on τ and x , and these conjugate variables form a Fourier pair allowing resolution in x by variation of τ. Optimization of sensitivity is discussed as well as resolution requirements, and preliminary results are presented demonstrating the viability of the technique.