Meyer C H, Pauly J M, Macovski A, Nishimura D G
Information Systems Laboratory, Stanford University, California 94305.
Magn Reson Med. 1990 Aug;15(2):287-304. doi: 10.1002/mrm.1910150211.
Using a k-space interpretation of small-tip excitation, a single excitation pulse has been designed that is simultaneously selective in space and resonant frequency. An analytic expression for the response of this pulse has been derived. The pulse has been implemented on a 1.5-T imaging system. The pulse has been applied to a rapid gradient-echo imaging sequence that forms both water and fat images within a breath-holding interval. These rapid images are free of the chemical shift artifacts at organ boundaries that typically afflict conventional rapid images. The pulse can be applied to a variety of other sequences, such as multislice water/fat sequences and rapid k-space scanning sequences.
利用小角度激发的k空间解释，设计了一种单激发脉冲，该脉冲在空间和共振频率上同时具有选择性。已推导出该脉冲响应的解析表达式。该脉冲已在1.5-T成像系统上实现。该脉冲已应用于快速梯度回波成像序列，该序列在屏气间隔内形成水和脂肪图像。这些快速图像没有通常困扰传统快速图像的器官边界处的化学位移伪影。该脉冲可应用于各种其他序列，如多层水/脂肪序列和快速k空间扫描序列。
