Szeverenyi N M, Kieffer S A, Cacayorin E D
Department of Radiology, State University of New York Health Science Center, Syracuse 13210.
AJNR Am J Neuroradiol. 1988 Nov-Dec;9(6):1069-74.
A modification of the standard spin-echo pulse sequence designed to suppress motion artifacts was clinically evaluated on T2-weighted MR images of the cervicocranial region. A retrospective study involving 40 patients, half of whom were examined with a standard T2-weighted multislice spin-echo sequence and half of whom were examined with a gradient waveform modification of the same sequence, uniformly demonstrated restoration of CSF signal intensity on images obtained with the gradient modified sequence. The cervical subarachnoid spaces, cisterna magna, medullary cistern, pontine cistern, fourth ventricle, and aqueduct were more consistently and brightly represented. However, the phase-encoding artifacts arising from CSF motion were not significantly reduced by using the gradient waveform modified pulse sequence. Digital subtraction of an image obtained with the standard sequence from an image of the same slice with the gradient modified sequence provides a direct image representation of CSF flow.
为抑制运动伪影而设计的标准自旋回波脉冲序列的一种改进方法，在颈颅区域的T2加权磁共振图像上进行了临床评估。一项涉及40名患者的回顾性研究中，一半患者用标准的T2加权多层自旋回波序列检查，另一半患者用同一序列的梯度波形改进序列检查，结果一致显示，用梯度改进序列获得的图像上脑脊液信号强度得以恢复。颈蛛网膜下腔、枕大池、延髓池、脑桥池、第四脑室和导水管显示得更连贯且更清晰。然而，使用梯度波形改进脉冲序列并未显著减少由脑脊液流动产生的相位编码伪影。用标准序列获得的同一层面图像与用梯度改进序列获得的图像进行数字相减，可直接呈现脑脊液流动图像。
