Figures 2(a) and (b) show the results of the DPIV cross-correlation for an instantaneous frame of the left ventricle data, (a) showing the data without the ROI matrix, and (b) using the ROI matrix to eliminate all false vectors. The result of this process is clear, as the true shape of the ventricle appears, and our experimental data shows close to zero velocity at the walls, approaching the no-slip condition (a close-up of the data at the walls is shown in Figure 3). Having the exact instantaneous velocities at the wall, we can accurately calculate the wall shear stresses.
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