Guo Q, Kashmar G, Nalcioglu O
Department of Radiological Sciences, University of California, Irvine 92717.
Magn Reson Imaging. 1991;9(2):129-39. doi: 10.1016/0730-725x(91)90001-3.
Flow dephasing effects in NMR images can be significantly reduced by the use of gradient quasi-half-echo signals. They can also be reduced by moment-nulling techniques. In this paper, an efficient imaging pulse sequence, the flow-insensitive enhanced quasi-half-echo method is developed in which these two techniques are combined. This pulse sequence is used to reduce dephasing effects in images acquired to enhance blood vessels in gradient echo subtraction angiography. Both phase corrected and uncorrected quasi-half-echo reconstruction techniques are used to determine the effect on image resolution and vessel enhancement.
通过使用梯度准半回波信号，核磁共振成像中的流动失相效应可显著降低。也可通过矩归零技术来降低这些效应。本文开发了一种高效的成像脉冲序列——流动不敏感增强准半回波方法，该方法将这两种技术结合在一起。此脉冲序列用于减少在梯度回波减影血管造影中采集的用于增强血管的图像中的失相效应。相位校正和未校正的准半回波重建技术均用于确定对图像分辨率和血管增强的影响。
