Automated rectilinear self-gated cardiac cine imaging
Automated rectilinear self-gated cardiac cine imaging
复制标题
DOI：
10.1002/mrm.20212
复制
发表时间：
2004-10-01
影响因子：
3.3
通讯作者：
Simonetti, OP
中科院分区：
文献类型：
--
作者：
Crowe, ME;Larson, AC;Simonetti, OP
心脏MR成像中基于ECG的门控需要额外的患者准备时间，易受RF和磁干扰的影响，并且对相当大比例的患者无效。已经描述了使用交错的中心k空间线或投影重建来获得与心动周期同步的MR信号的“无线”或“自选通”技术。然而，交错的中心线方法导致采集时间加倍，而投影重建方法会遇到径向条纹伪影。在这项工作中，提出了一种新的自门控技术，以克服这些限制。对回顾性门控TrueFISP电影序列进行了修改，以在读数和相位梯度回卷后采集短秒回波。从该第二回波获得的信息用于导出选通信号。在10名健康志愿者中，将该技术与基于ECG的门控进行了比较，结果显示图像质量无显著差异。结果表明，这种方法可以作为一种替代的门控策略，而不需要外部生理信号检测。(C)2004 Wiley-Liss，Inc.
ECG-based gating in cardiac MR imaging requires additional patient preparation time, is susceptible to RF and magnetic interference, and is ineffective in a significant percentage of patients. "Wireless" or "self-gating" techniques have been described using either interleaved central k-space lines or projection reconstruction to obtain MR signals synchronous with the cardiac cycle. However, the interleaved, central line method results in a doubling of the acquisition time, while radial streak artifacts are encountered with the projection reconstruction method. In this work, a new self-gating technique is presented to overcome these limitations. A retrospectively gated TrueFISP cine sequence was modified to acquire a short second echo after the readout and phase gradients are rewound. The information obtained from this second echo was used to derive a gating signal. This technique was compared to ECG-based gating in 10 healthy volunteers and shown to have no significant difference in image quality. The results indicate that this method could serve as an alternative gating strategy without the need for external physiological signal detection. (C) 2004 Wiley-Liss, Inc.