MR IMAGING OF MOTION WITH SPATIAL MODULATION OF MAGNETIZATION
MR IMAGING OF MOTION WITH SPATIAL MODULATION OF MAGNETIZATION
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DOI：
10.1148/radiology.171.3.2717762
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发表时间：
1989-06-01
期刊：
影响因子：
19.7
通讯作者：
DOUGHERTY, L
中科院分区：
文献类型：
--
作者：
AXEL, L;DOUGHERTY, L
一种新颖的磁共振成像技术通过在成像之前空间调制磁化程度来提供运动的直接成像。预成像脉冲序列由产生横向磁化的射频（RF）脉冲、沿着梯度方向“包裹”相位的磁场梯度以及将调制的横向磁化与纵向磁化混合的第二RF脉冲组成。所得到的图像显示出由于调制而产生的周期性条纹。条纹化时间和图像形成时间之间的运动直接表现为条纹的相应位移。该技术可用于研究心壁运动，区分缓慢移动的血液和血栓，以及研究血液和脑脊液的流动。
A novel magnetic resonance imaging technique provides direct imaging of motion by spatially modulating the degree of magnetization prior to imaging. The preimaging pulse sequence consists of a radio-frequency (RF) pulse to produce transverse magnetization, a magnetic field gradient to "wrap" the phase along the direction of the gradient, and a second RF pulse to mix the modulated transverse magnetization with the longitudinal magnetization. The resulting images show periodic stripes due to the modulation. Motion between the time of striping and image formation is directly demonstrated as a corresponding displacement of the stripes. This technique can be used to study heart wall motion, to distinguish slowly moving blood from thrombus, and to study the flow of blood and cerebrospinal fluid.