Duyn J H, Yang Y, Frank J A, van der Veen J W
Laboratory of Diagnostic Radiology Research and CBDB, National Institutes of Health, Bethesda, Maryland 20892, USA.
J Magn Reson. 1998 May;132(1):150-3. doi: 10.1006/jmre.1998.1396.
A method is presented to correct for the imperfections of spatial encoding gradients in MRI. The approach is simple and fast, can be performed with standard scanner hardware, and does not require separate measurements with reference phantoms. The new method, using the MR signal to accurately measure the k-space trajectory of the imaging sequence, allows for correction of gradient hardware imperfections and eddy-current effects. Initial measurements are presented which demonstrate the efficacy of the method to correct images acquired with spiral and EPI scan techniques.
本文提出了一种校正磁共振成像（MRI）中空间编码梯度缺陷的方法。该方法简单快速，可使用标准扫描仪硬件执行，且无需使用参考体模进行单独测量。这种新方法利用磁共振信号精确测量成像序列的k空间轨迹，能够校正梯度硬件缺陷和涡流效应。文中给出了初步测量结果，证明了该方法对校正采用螺旋和回波平面成像（EPI）扫描技术采集的图像的有效性。
