3D luminal contour reconstruction.

<p>An initial circular luminal contour on a cross-sectional plane (diameter <i>d</i>′<sub><i>k</i>,<i>N</i></sub>) and its control points; four (top) and six (bottom) interpolatory control points Q<sub>k</sub> are reconstructed; the initial control points are adjusted as described in the text; the final contour is obtained.</p>