Computed tomographic x-ray velocimetry
Abstract
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.
- Publication:
-
Applied Physics Letters
- Pub Date:
- January 2010
- DOI:
- 10.1063/1.3285173
- Bibcode:
- 2010ApPhL..96b3702D
- Keywords:
-
- blood flow measurement;
- cardiovascular system;
- computerised tomography;
- image reconstruction;
- least squares approximations;
- synchrotrons;
- velocity measurement;
- 87.57.Q-;
- 06.30.Gv;
- 87.85.gf;
- 87.19.U-;
- 87.19.Hh;
- 87.57.nf;
- Computed tomography;
- Velocity acceleration and rotation;
- Fluid mechanics and rheology;
- Hemodynamics;
- Cardiac dynamics;
- Reconstruction