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. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: IEEE Trans Nucl Sci. 2009 Oct 1;56(5):2728–2738. doi: 10.1109/TNS.2009.2016196

Fig. 5.

Fig. 5

2D NURBS surface developed to follow the tag lines of the image planes. The knots (solid lines) of the surface were setup to form a 2D grid. Knot lines running in the v direction were spaced with the tag spacing of the images which was 7.97 mm. The knot lines running in the u direction were spaced more frequently at 1.65 mm for increased sampling. For our work, the 2D NURBS surface was defined with n = 23 and m = 103. The control points and grid points (squares) of the initial surface are located at the intersection of the knot lines.