Single echo MRI.

Single echo MRI.
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DOI:
10.1371/journal.pone.0086008
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Constable RT
Constable RT
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Galiana G;Constable RT

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以前的非线性梯度研究集中在轨迹重建图像的最小数量的回波。在这里,我们描述的序列中的非线性梯度随时间变化,以获取在一个单一的读出图像。读出被设计为非常平滑,以便它可以被压缩到最小的时间,而不违反周围神经刺激限制,从单个4 ms回波产生图像。该序列的灵感来自于考虑每个体素的编码,即体素通过读出遵循的相位累积,这是一种与传统编码理论相关的方法。我们提出了模拟的初始序列,低转换速率模拟,和更高的分辨率重建。可以实现极快的采集,但正如人们所预期的那样,由于高梯度强度,SNR相对于较慢的笛卡尔采样方案有所降低。非线性梯度可以在单个<10 ms回波中获取图像的前景使其成为图像编码的新颖且有趣的方法。
Previous nonlinear gradient research has focused on trajectories that reconstruct images with a minimum number of echoes. Here we describe sequences where the nonlinear gradients vary in time to acquire the image in a single readout. The readout is designed to be very smooth so that it can be compressed to minimal time without violating peripheral nerve stimulation limits, yielding an image from a single 4 ms echo. This sequence was inspired by considering the code of each voxel, i.e. the phase accumulation that a voxel follows through the readout, an approach connected to traditional encoding theory. We present simulations for the initial sequence, a low slew rate analog, and higher resolution reconstructions. Extremely fast acquisitions are achievable, though as one would expect, SNR is reduced relative to the slower Cartesian sampling schemes because of the high gradient strengths. The prospect that nonlinear gradients can acquire images in a single <10 ms echo makes this a novel and interesting approach to image encoding.
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