Patent ID: 6573719
Filing Date: 2003-06-03
Classification: G01R

Abstract:
An magnetic resonance method including the steps of:generating a navigator pulse to excite a nuclear magnetization in a spatially limited volume by means of at least one RF pulse and at least two gradient magnetic fields having gradients which extend differently with respect to time and space, receiving at least one MR signal from the volume, in conjunction with a further gradient magnetic field for evaluation, wherein a variation in time of the gradient magnetic fields results in the generation of at least two MR signals which correspond to an excitation in k space along mutually offset trajectories, and combining the MR signals; wherein a first gradient magnetic field (Gx) is generated during the RF pulse, its gradient extending in a first direction and its polarity being repeatedly reversed between a positive and a negative value; wherein a second gradient magnetic field (Gy1; Gy2), having a gradient extending in a second direction, is generated during the polarity reversal of the first gradient magnetic field (Gx), the time integral over this gradient being smaller than that during the RF pulse; wherein a third gradient magnetic field (Gz) is generated after the RF pulse; wherein a respective MR signal is read out each time for a polarity of the third gradient magnetic field, and wherein said MR signals are combined; and wherein the polarity of the third gradient magnetic field is reversed once, and the time integral over the second gradient amounts to half the time integral over this gradient during a polarity reversal of the first gradient magnetic field.