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Table 1 RMS tracking errors (in pixels) of estimated displacements compared with known flow fields measured in three Cartesian directions (x, y and z).

From: Deformation analysis of 3D tagged cardiac images using an optical flow method

β Angle RMSx RMSy RMSz
0 0.627 0.634 0.687
15 0.626 0.640 0.705
30 0.626 0.645 0.689
45 0.629 0.646 0.705
60 0.649 0.677 0.832
75 0.631 0.652 0.776
90 0.638 0.654 0.945
  1. Orientation of the third oblique tag plane is controlled by adjusting the angle between the z-axis and the tagging plane (β).