Department of Experimental Physics 5, University of Wuerzburg, Germany.
J Magn Reson Imaging. 2013 Mar;37(3):727-32. doi: 10.1002/jmri.23798. Epub 2012 Sep 17.
To use the acquisition of the k-space center signal (DC signal) implemented into a Cartesian three-dimensional (3D) FLASH sequence for retrospective respiratory self-gating and, thus, for the examination of the whole human lung in high spatial resolution during free breathing.
Volunteer as well as patient measurements were performed under free breathing conditions. The DC signal is acquired after the actual image data acquisition within each excitation of a 3D FLASH sequence. The DC signal is then used to track respiratory motion for retrospective respiratory gating.
It is shown that the acquisition of the DC signal after the imaging module can be used in a 3D FLASH sequence to extract respiratory motion information for retrospective respiratory self-gating and allows for shorter echo times (TE) and therefore increased lung parenchyma SNR.
The acquisition of the DC signal after image signal acquisition allows successful retrospective gating, enabling the reconstruction of high resolution images of the whole human lung under free breathing conditions.
利用在笛卡尔三维（3D）FLASH 序列中实现的 k 空间中心信号（DC 信号）采集进行回顾性呼吸门控，从而在自由呼吸时以高空间分辨率检查整个人类肺部。
在自由呼吸条件下进行志愿者和患者的测量。在每个 3D FLASH 序列的激发后实际采集图像数据后采集 DC 信号。然后，使用 DC 信号来跟踪呼吸运动以进行回顾性呼吸门控。
结果表明，在成像模块之后采集 DC 信号可以用于 3D FLASH 序列中，以提取呼吸运动信息，用于回顾性呼吸门控，并允许更短的回波时间（TE），从而提高肺实质 SNR。
在图像信号采集之后采集 DC 信号可以成功地进行回顾性门控，从而能够在自由呼吸条件下重建整个人类肺部的高分辨率图像。
