according to a second possibility the k domain can be scanned along parallel planes each of which may be covered by a complete spiral pattern in accordance with fig2 a however it is not necessary to measure the mr data in all of these planes this is illustrated in fig6 which shows the position of the planes in the k domain the plane 30 containing the origin of the k domain the planes in the k domain which are situated around this origin i e the low spatial frequencies must be completely scanned this is not necessary for the planes which are situated further from the zero point and which are associated with the high spatial frequencies for example as is indicated in fig6 the third plane 33 and the fifth plane 35 above the central plane 30 can be omitted and the mr data associated with these planes can be reconstructed from the mr data of the mirrored planes 33 39 and 35 39 it being assumed that ignoring the phase shift u03b2 mirrored points on the planes 33 or 33 39 have complex conjugate mr data however it is also possible to vary the magnetic gradient fields in such a manner that the planes outside the center of the k domain are covered by an incomplete.