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首页> 外文期刊>Journal of magnetic resonance >Single-shot velocity mapping by rewinding of velocity encoding with Echo-Planar Imaging
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Single-shot velocity mapping by rewinding of velocity encoding with Echo-Planar Imaging

机译：通过使用回声平面成像的速度编码速度通过速度进行单次速度映射

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摘要

The ability of single-shot NMR imaging methods to follow the time evolution of a velocity distribution within an object is strongly limited by the phase errors accumulated as velocity maps are acquired. In the particular case of Carr-Purcell based sequences combined with Echo Planar Imaging acquisition, phase accumulates through subsequent images, hampering the possibility to acquire several velocity maps, which would be useful to determine transient behavior. In this work, we propose the use of a rewinding velocity encoding module applied after the acquisition of each image during the CPMG echo train. In this way, the first velocity module imparts a velocity dependent phase prior to the image acquisition and the second pair cancels this phase out before the next refocusing radiofrequency pulse is applied. The performance and limits of this method are studied by acquiring 100 images of a co-rotating Couette cell over a period of 1.6 s as a function of the rotation speed. The method is applied to determine the kinematic viscosity of a water/alcohol mixture, which is a relevant topic in many physical, chemical and biological processes. (C) 2019 Elsevier Inc. All rights reserved.
机译：单次射击NMR成像方法以遵循对象内的速度分布的时间演变的能力受到累积的相位误差，因为获取了速度图。在基于Carr-purcell基的序列的特定情况下，与回波平面成像采集结合，阶段通过后续图像累积，阻碍了获取若干速度图的可能性，这将是确定瞬态行为的有用。在这项工作中，我们建议在CPMG回声列车期间在获取每个图像之后应用的倒带速度编码模块。以这种方式，第一速度模块在图像获取之前赋予速度相关的相位，并且第二对在施加下一次重新剖足的射频脉冲之前取消该阶段。通过在1.6秒的时间内获取100旋转耦合电池的100个图像来研究该方法的性能和限制。该方法用于确定水/醇混合物的运动粘度，这是许多物理，化学和生物过程中的相关主题。 （c）2019 Elsevier Inc.保留所有权利。

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