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Comparison of Hough and Fourier transform approach in the study of kinetics of red blood cell aggregates

The kinetics of three-dimensional red blood cell (RBC) aggregates during sedimentation using an optical method was studied. The blood was taken from healthy donors. Sedimentation of RBCs and glutaraldehyde hardened RBCs in autologous plasma and the sedimentation of RBCs in Dextran at haematocrits 5% was investigated. Light intensity in the image plane of the suspension of the cells was recorded. The movement of the aggregates was visualized by means of a spatiotemporal analysis of the light intensity. With the use of Hough transform and two-dimensional Fourier transform the velocity of the aggregates was estimated. The velocity depends on the sample height and changes with time. Spatiotemporal distributions of the aggregate velocity were determined. A comparison of velocity distributions obtained with the two methods is presented.