1. A method for reducing Nyquist ghosts in a tomographic image acquired by magnetic resonance imaging, comprising the steps of: (S 1 ) for an EPI magnetic resonance imaging pulse sequence comprising a readout gradient pulse train defined as to pulse shape, pulse amplitude and pulse duration, under which echo signals are respectively readout, said echo signals having echo numbers respectively associated therewith, determining at least one progressive curve for at least one characterizing quantity of the respective echo signals dependent on the echo number thereof; (S 2 ) subjecting an examination subject to a diagnostic EPI pulse sequence comprising a readout gradient pulse train comprised of gradient pulses of alternating polarity with a simultaneously activated phase coding gradient, to acquire diagnostic phase-coded magnetic resonance data; (S 3 ) correcting said phase-coded diagnostic data using said at least one progression curve, to obtain a corrected diagnostic data set; and (S 4 ) Fourier transforming said corrected diagnostic data set to obtain an image data set with reduced Nyquist ghost artifacts.