Effects of refocusing flip angle modulation and view ordering in 3D fast spin echo.

Effects of refocusing flip angle modulation and view ordering in 3D fast spin echo.
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DOI:
10.1002/mrm.21680
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发表时间:
2008-09
影响因子:
3.3
通讯作者:
Rowley, Howard A.
Rowley, Howard A.
中科院分区:
医学3区
文献类型:
--
作者:
Busse, Reed F.;Brau, Anja C. S.;Vu, Anthony;Michelich, Charles R.;Bayram, Ersin;Kijowski, Richard;Reeder, Scott B.;Rowley, Howard A.

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最近的进展已经减少了三维快速自旋回波(3D-FSE)成像中的扫描时间,包括通过重聚焦翻转角(FA)调制和2D加速并行成像的非常长的回波序列。这项工作描述了一种方法来调制重聚焦FA,产生尖锐的点扩展函数(PSF)从很长的回波序列,同时行使直接控制最小,中心k空间,最大FA,以适应存在的流动和运动,SNR的要求,和RF功率限制。此外,提出了一种新的视图排序方法,将回波序列中的信号调制映射到ky-kz空间,从而实现非矩形k空间网格和自动校准2D加速并行成像。由于编码大矩阵需要较长的回波序列和较少的回波,因此可以在3-6分钟的扫描时间内采集具有高平面内和通过平面分辨率矩阵的大体积,如体积脑、膝和肾成像所示。
Recent advances have reduced scan time in three-dimensional fast spin echo (3D-FSE) imaging, including very long echo trains through refocusing flip angle (FA) modulation and 2D-accelerated parallel imaging. This work describes a method to modulate refocusing FAs that produces sharp point spread functions (PSFs) from very long echo trains while exercising direct control over minimum, center-k-space, and maximum FAs in order to accommodate the presence of flow and motion, SNR requirements, and RF power limits. Additionally, a new method for ordering views to map signal modulation from the echo train into ky-kz space that enables nonrectangular k-space grids and autocalibrating 2D-accelerated parallel imaging is presented. With long echo trains and fewer echoes required to encode large matrices, large volumes with high in- and through-plane resolution matrices may be acquired with scan times of 3–6 min, as demonstrated for volumetric brain, knee, and kidney imaging.
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