Pattany P M, Phillips J J, Chiu L C, Lipcamon J D, Duerk J L, McNally J M, Mohapatra S N
J Comput Assist Tomogr. 1987 May-Jun;11(3):369-77. doi: 10.1097/00004728-198705000-00001.
A technique has been developed that significantly improves the image resolution and reduces motion artifacts in conventional two-dimensional Fourier transform and three-dimensional Fourier transform magnetic resonance imaging sequences. Modifications on the gradient waveforms completely refocus the transverse magnetization at the echo time, regardless of the motion occurring between the time of the 90 degrees radiofrequency excitation and the echo time (within-view). This accomplishes suppression of motion artifacts and regains the signal from flowing blood and CSF. Images of the head, abdomen, chest, and spine are reproduced which show the increase in signal and anatomical detail that would otherwise be degraded and lost in artifact noise. This technique has reduced the practical difficulty of obtaining clinically diagnostic T2-weighted abdominal images. It also has allowed diagnostic quality T1- and T2-weighted images to be obtained with one acquisition per view, thus reducing the total scan time.
已开发出一种技术，可显著提高传统二维傅里叶变换和三维傅里叶变换磁共振成像序列中的图像分辨率并减少运动伪影。对梯度波形的修改可在回波时间完全重新聚焦横向磁化，而不管在90度射频激发时间和回波时间之间（视野内）发生的运动如何。这实现了对运动伪影的抑制，并重新获得了来自流动血液和脑脊液的信号。再现了头部、腹部、胸部和脊柱的图像，这些图像显示出信号增加和解剖细节，否则这些信号和细节会在伪影噪声中退化和丢失。该技术降低了获取临床诊断性T2加权腹部图像的实际难度。它还允许通过每个视野一次采集获得诊断质量的T1加权和T2加权图像，从而减少了总扫描时间。
