High-resolution 3D radial bSSFP with IDEAL.

High-resolution 3D radial bSSFP with IDEAL.
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DOI:
10.1002/mrm.24633
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发表时间:
2014-01
影响因子:
3.3
通讯作者:
Block, Walter F.
Block, Walter F.
中科院分区:
医学3区
文献类型:
--
作者:
Moran, Catherine J.;Brodsky, Ethan K.;Bancroft, Leah Henze;Reeder, Scott B.;Yu, Huanzhou;Kijowski, Richard;Engel, Dorothee;Block, Walter F.

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径向轨迹有利于高分辨率平衡稳态自由进动(bSSFP),因为有效的梯度提供了更多的时间来扩展k空间中的轨迹。已经开发了许多支持脂肪-水分离的径向bSSFP方法;然而,这些方法中的大多数需要具有有限B 0不均匀性的环境。在这项工作中,通过将3D径向轨迹与IDEAL化学物质分离方法相结合,在更具挑战性的B 0环境中实现了具有脂肪-水分离的高分辨率bSSFP。使用双通脉冲序列描述了在bSSFP和IDEAL的时序约束内保持非常高的分辨率的方法。研究了在每个回波时间对一组独特的径向线进行采样,以规避IDEAL作为多回波采集而产生的较长扫描时间。欠采样文物在这个轨迹的表现形式和它们对化学物种分离的影响进行了研究,在比较的情况下,其中每个回波样本的径向线相同的集合。这种新的bSSFP方法在5分钟的扫描中达到了0.63 mm的各向同性分辨率,并在困难的体内成像环境中得到了证明,包括在1.5 T下使用ACL重建硬件的乳房和膝关节。
Radial trajectories facilitate high-resolution balanced steady state free precession (bSSFP) because the efficient gradients provide more time to extend the trajectory in k-space. A number of radial bSSFP methods that support fat-water separation have been developed; however, most of these methods require an environment with limited B0 inhomogeneity. In this work, high-resolution bSSFP with fat-water separation is achieved in more challenging B0 environments by combining a 3D radial trajectory with the IDEAL chemical species separation method. A method to maintain very high resolution within the timing constraints of bSSFP and IDEAL is described using a dual-pass pulse sequence. The sampling of a unique set of radial lines at each echo time is investigated as a means to circumvent the longer scan time that IDEAL incurs as a multi-echo acquisition. The manifestation of undersampling artifacts in this trajectory and their effect on chemical species separation are investigated in comparison to the case in which each echo samples the same set of radial lines. This new bSSFP method achieves 0.63 mm isotropic resolution in a 5-minute scan and is demonstrated in difficult in vivo imaging environments, including the breast and a knee with ACL reconstruction hardware at 1.5 T.
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