A computationally efficient method for tracking reference position displacements for motion compensation in magnetic resonance imaging
A computationally efficient method for tracking reference position displacements for motion compensation in magnetic resonance imaging
复制标题
一种计算有效的磁共振成像运动补偿参考位置位移跟踪方法
DOI：
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发表时间：
1999
影响因子：
3.3
通讯作者：
K. King
中科院分区：
文献类型：
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作者：
T. Foo;K. King
描述了一种用于使用MR成像来检测和跟踪身体内的参考结构的位移的快速且计算高效的方法。该方法用于确定横膈膜的位置，以便将数据采集同步到腹部和胸部器官的相同相对位置，从而最小化或消除呼吸运动伪影。所描述的方法使用参考结构的时域线性相移来确定其作为呼吸周期的函数的空间位置位移。来自二维矩形激励柱的信号首先被傅立叶变换到图像域，变迹，然后变换回时域。目标边缘在图像域中的相对位移是从所得时域信息的自相关确定的。研究发现，这种技术所需的计算量比互相关或最小二乘分析少三到八倍，具体取决于导航器参数。Magn Reson Med 42：548-553，1999.© 1999 Wiley利斯公司
A fast and computationally efficient method for detecting and tracking the displacement of a reference structure within the body using MR imaging is described. This method is used to determine the position of the diaphragm in order to synchronize the data acquisition to the same relative position of the abdominal and thoracic organs, thereby minimizing or eliminating respiratory motion artifacts. The method described uses the time domain linear phase shift of a reference structure to determine its spatial positional displacement as a function of the respiratory cycle. The signal from a two‐dimensional rectangular excitation column is first Fourier‐transformed to the image domain, apodized, and then transformed back to the time domain. The relative displacement of a target edge in the image domain is determined from an autocorrelation of the resulting time domain information. This technique was found to require between three and eight times less computation than either cross‐correlation or least‐squares analysis, depending on the navigator parameters. Magn Reson Med 42:548–553, 1999. © 1999 Wiley‐Liss, Inc.
影响因子：
19.7
作者：
Li, DB;Kaushikkar, S;Gutierrez, FR
通讯作者：
Gutierrez, FR