Demo bi-transparency - Diagnostic image sequence 405 (back)

Description

This sequence illustrate the ability of the method to estimate interventional tools motions, if they are moving coherently with organs.

It involves a single significant layer. An other layer can be assigned to the coronary containing the stent, but it is little textured: only the stent is informative.

The estimated displacements are directed toward the past to respect the notations of the Transparent Motion Constraint. As a result they are in the opposite direction compared to the usual represented velocity direction.

Estimation result at two interesting time instants

We present two frames, where the motion of the stent was correctly handled. The overall field is strange on the first example, but it is correct in the area corresponding to the stent.

Whole processed sequence

We also present the overall processed sequence. It shows the estimated affine motion fields, along with the corresponding frames.

The results are satisfactory for about 60% of time instants, though the second layer is poorly textured. The motion of the stent is often correctly estimated.

When the corresponding layer is not moving, our method estimates an incoherent motion corresponding to the noise.