PARTICLE IMAGE VELOCIMETRY SUITABLE FOR X-RAY PROJECTION IMAGING

摘要

A 2D or 3D velocity field is reconstructed from cross-correlation analysis of image pairs of a sample, without first reconstructing images of the sample spatial structure. The method can be implemented via computer tomographic X-ray particle image velocimetry, using multiple projection angles, with phase contrast images forming dynamic speckle patterns. Estimated cross-correlations may be generated via convolution of a measured autocorrelation function with a velocity probability density function, and the velocity coefficients iteratively optimised to minimise the error between the estimated cross-correlations and the measured cross-correlations. The method may be applied to measure blood flow, and the motion of tissue and organs such as heart and lungs.

主权项

1. A method for providing an image of a sample comprising the steps of:
1. recording images encoding data for the sample in terms of Cartesian coordinates; 2. reconstructing a 2D or 3D data field from the information encoded in the recorded images; 3(a) segmenting an image of the sample; and 3(b) associating each segment with regions of the 2D or 3D data fieldwherein steps 1 to 3 are automated.