Computed tomographic x-ray velocimetry
Computed tomographic x-ray velocimetry
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DOI：
10.1063/1.3285173
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发表时间：
2010-01-11
影响因子：
4
通讯作者：
Fouras, A.
中科院分区：
文献类型：
--
作者：
Dubsky, S.;Jamison, R. A.;Fouras, A.
描述了一种X射线测速技术，该技术提供了三维空间中的速度测量的三个分量。目前的X射线测速技术，它使用在一个单一的投影角度拍摄的粒子图像，是有限的速度测量的两个组成部分，并不能在三维测量没有流场的先验知识。所提出的方法使用多个投影角度来克服这些限制。该技术使用最小二乘迭代方案直接从二维图像对互相关断层重建三维速度场，而不需要重建三维粒子图像。同步加速器实验证明了该技术在不透明血管中测量血流的有效性，并应用于心血管疾病的诊断和治疗。
An x-ray velocimetry technique is described which provides three components of velocity measurement in three dimensional space. Current x-ray velocimetry techniques, which use particle images taken at a single projection angle, are limited to two components of velocity measurement, and are unable to measure in three dimensions without a priori knowledge of the flow field. The proposed method uses multiple projection angles to overcome these limitations. The technique uses a least-squares iterative scheme to tomographically reconstruct the three-dimensional velocity field directly from two-dimensional image pair cross-correlations, without the need to reconstruct three-dimensional particle images. Synchrotron experiments demonstrate the effectiveness of the technique for blood flow measurement in opaque vessels, with applications for the diagnosis and treatment of cardiovascular disease.