| 摘要 |
The invention relates to a method for magnetic resonance imaging (MRI) of at least a portion of a body placed in a stationary and substantially homogeneous main magnetic field. The method comprises the steps of subjecting the body to a diffusion-weighting sequence (DW 1 ), generating a train of M echoes (E 1, E 2, E 3, E 4, E 5 ) by an imaging sequence (EPI 1 ), and measuring this train of MR echoes. These steps are repeated until a complete imaging data set with a sufficient number of phase-encoding steps is measured. Thereafter, the imaging data set is corrected for macroscopic motions by means of an individual phase-correction of each train of MR echoes. Finally, an image is reconstructed from the imaging data. In order to provide a method for diffusion-weighted imaging, which requires a minimum additional measurement time for determining the phase errors of the imaging signals and which also guarantees a robust compensation of image artifacts caused by macroscopic motions of the body of the examined patient, the invention suggests to select the phase-encoding scheme of the imaging sequence such that each train of MR echoes (E 1, E 2, E 3, E 4, E 5 ) comprises at least one initial MR navigator echo (E 1 ), which forms and integral part of the imaging data set, wherein the phase-correction is derived from the MR navigator echo.
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