公开(公告)号：WO2016180983A1

公开(公告)日：2016-11-17

申请号：PCT/EP2016/060920

申请日：2016-05-13

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： KARAMPINOS, Dimitrios ,  RUSCHKE, Stefan ,  KOOIJMAN-KURFUERST, Hendrik ,  HOLGER, Eggers

IPC: G01R33/48 ,  G01R33/561 ,  G01R33/565

CPC classification number: G01R33/4828 ,  G01R33/5615 ,  G01R33/5616 ,  G01R33/56581

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).

Abstract translation: 本发明涉及放置在MR装置（1）的检查体积中的物体的MR成像方法。 本发明的目的是提供一种多回波成像技术，其避免伴随的梯度引起的相位误差效应造成的伪像和/或误差。 本发明的方法包括以下步骤：a）通过对象进行至少一个RF脉冲和切换磁场梯度的多回波成像序列，产生不同回波时间的回波信号; b）获取回波信号; c）校正所获取的回波信号以用于伴随的梯度诱发相位误差，其包括：从在该回波时间产生的回波信号中重构每个回波时间的复数MR图像; 根据成像序列的梯度波形计算每个回波时间和每个图像位置的累积伴随梯度相位误差; 以及 - 根据相应的回波时间和图像位置的计算出的累积伴随梯度诱发相位误差，对每个MR图像的每个体素施加相位校正。 此外，本发明涉及MR装置（1）以及要在MR装置（1）上运行的计算机程序。