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1. (WO2016180983) MULTI-ECHO MRI WITH CORRECTION OF CONCOMITANT GRADIENT-INDUCED PHASE ERRORS

Pub. No.:    WO/2016/180983    International Application No.:    PCT/EP2016/060920
Publication Date: Fri Nov 18 00:59:59 CET 2016 International Filing Date: Sat May 14 01:59:59 CEST 2016
IPC: G01R 33/48
G01R 33/561
G01R 33/565
Applicants: KONINKLIJKE PHILIPS N.V.
Inventors: KARAMPINOS, Dimitrios
RUSCHKE, Stefan
KOOIJMAN-KURFUERST, Hendrik
HOLGER, Eggers
Title: MULTI-ECHO MRI WITH CORRECTION OF CONCOMITANT GRADIENT-INDUCED PHASE ERRORS
Abstract:
The invention relates to a method of MR imaging of an object placed in an examination volume of a MR device (1). It is an object of the invention to provide a multi echo imaging technique that avoids artifacts and/or errors due the concomitant gradient- induced phase error effect. The method of the invention comprises the steps of: a) generating echo signals at different echo times by subjecting the object to a multi-echo imaging sequence of at least one RF pulse and switched magnetic field gradients; b) acquiring the echo signals; c) correcting the acquired echo signals for concomitant gradient-induced phase errors, which comprises: reconstructing a complex MR image for each echo time from the echo signals generated at this echo time; computing the accumulated concomitant gradient-induced phase error for each echo time and for each image position from the gradient waveforms of the imaging sequence; and - applying a phase correction to each voxel of each of the MR images according to the computed accumulated concomitant gradient-induced phase error for the respective echo time and image position. Moreover, the invention relates to a MR device (1) and to a computer program to be run on a MR device (1).