Epi Ghost Correction Involving Sense

Abstract

In an EPI acquisition sequence for magnetic resonance signals k-space is scanned along sets of lines in k-space along opposite propagation directions, e.g. odd and even lines in k-space. Phase errors that occur due to the opposite propagation directions are corrected for in a SENSE-type parallel imaging reconstruction. The phase error distribution in image space may be initially estimated, calculated form the phase difference between images reconstructed from magnetic resonance signals acquired from the respective sets of k-space lines, or from an earlier dynamic.

Description

technical field [0001] The present invention relates to a magnetic resonance imaging method comprising an echo planar imaging (EPI) acquisition sequence. Background technique [0002] EPI acquisition of magnetic resonance signals is known from M.H. Buoncore and D.C. Zhu in the paper "Image-based ghost correction for interleaved EPI" (MRM 45, 2001, pp. 96-108). [0003] Known magnetic resonance imaging methods solve the problem of artifacts generally caused by phase distortions in the EPI sequence depending on the readout direction (x) and phase encoding direction (y). The image is reconstructed using only left-to-right or right-to-left k-space lines (replacing missing lines with zeros). The optimal phase distortion at each (x,y) position is found according to an iterative solution. [0004] In addition, international application WO2012 / 047771 discloses a magnetic resonance imaging method in which an aliased image is formed from data acquired in multiple EPI shots. Conten...

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Problems solved by technology

[0003] Known magnetic resonance imaging methods solve the problem of artifacts generally caused by phase distortion in EPI sequences according to the readout direction (x) and phase encode direction (y)

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