High-resolution multishot spiral diffusion tensor imaging with inherent correction of motion-induced phase errors.
High-resolution multishot spiral diffusion tensor imaging with inherent correction of motion-induced phase errors.
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DOI：
10.1002/mrm.24709
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发表时间：
2014-02
影响因子：
3.3
通讯作者：
Guidon, Arnaud
中科院分区：
文献类型：
--
作者：
Trong-Kha Truong;Guidon, Arnaud
旨在开发和比较三种新型重建方法，这些方法旨在对多次激发螺旋扩散张量成像（DTI）中的运动诱导相位误差进行固有校正，而无需可变密度螺旋轨迹或导航回波。第一种方法简单地平均从每个镜头用灵敏度编码（SENSE）重建的幅度图像，而第二种和第三种方法依赖于SENSE来估计每个镜头的运动引起的相位误差，并且随后分别使用直接相位减法或迭代共轭梯度（CG）算法来校正所产生的伪影。对健康志愿者进行了数值模拟和体内实验，以评估这些方法的性能。前两种方法遭受低信噪比（SNR）或重建的扩散加权图像和分数各向异性图中的残留伪影。相比之下，第三种方法提供了高质量，高分辨率的DTI结果，揭示了精细的解剖细节，如皮质灰质中的径向扩散各向异性。所提出的SENSE+CG方法可以固有地和有效地校正相位误差，信号丢失，以及在多激发螺旋DTI中由刚性和非刚性运动引起的混叠伪影，而不增加扫描时间或降低SNR。
To develop and compare three novel reconstruction methods designed to inherently correct for motion-induced phase errors in multi-shot spiral diffusion tensor imaging (DTI) without requiring a variable-density spiral trajectory or a navigator echo. The first method simply averages magnitude images reconstructed with sensitivity encoding (SENSE) from each shot, whereas the second and third methods rely on SENSE to estimate the motion-induced phase error for each shot, and subsequently use either a direct phase subtraction or an iterative conjugate gradient (CG) algorithm, respectively, to correct for the resulting artifacts. Numerical simulations and in vivo experiments on healthy volunteers were performed to assess the performance of these methods. The first two methods suffer from a low signal-to-noise ratio (SNR) or from residual artifacts in the reconstructed diffusion-weighted images and fractional anisotropy maps. In contrast, the third method provides high-quality, high-resolution DTI results, revealing fine anatomical details such as a radial diffusion anisotropy in cortical gray matter. The proposed SENSE+CG method can inherently and effectively correct for phase errors, signal loss, and aliasing artifacts caused by both rigid and nonrigid motion in multi-shot spiral DTI, without increasing the scan time or reducing the SNR.
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影响因子：
3.3
作者：
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影响因子：
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