不均匀磁场中的交叉编码磁共振成像。

Cross-encoded magnetic resonance imaging in inhomogeneous fields.

机构信息

Département de Chimie, associé au CNRS, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France.

出版信息

J Magn Reson. 2009 Dec;201(2):199-204. doi: 10.1016/j.jmr.2009.09.008. Epub 2009 Sep 11.

DOI:10.1016/j.jmr.2009.09.008

PMID:19796973

Abstract

In magnetic resonance imaging (MRI), it is possible to cancel the effects of severe inhomogeneities of the magnetic field even if the field profile is unknown. The new 'cross-encoded' method is based on adiabatic frequency-modulated pulses combined with two orthogonal gradients that are applied simultaneously during encoding and decoding. Undistorted two- and three-dimensional images can be obtained in inhomogeneous fields where the breadth of the water resonance extends over several kHz.

摘要

在磁共振成像（MRI）中，即使磁场轮廓未知，也有可能消除严重的磁场不均匀性的影响。新的“交叉编码”方法基于绝热调频脉冲，结合在编码和解码过程中同时施加的两个正交梯度。在水共振带宽扩展到几个千赫兹的不均匀场中，可以获得未失真的二维和三维图像。