3D-2D Deformable Image Registration Using Feature-Based Nonuniform Meshes

Table 2

Evaluation of reconstruction accuracy based on a digital XCAT male phantom.

	Uniform orthogonal grid	Uniform tetrahedron mesh	Nonuniform tetrahedron mesh	Nonuniform tetrahedron mesh	Voxel-based method
Number of vertices	1,050	987	1,005	10,004	8,650,762
NCC of images	0.9829	0.9835	0.9855	0.9858	0.9872
NRMSE of images	0.1749	0.1705	0.1612	0.1593	0.1514
NCC of DVF	0.7690	0.7829	0.8150	0.8265	0.6061
NRMSE of DVF	1.2366	1.0923	0.8118	0.8059	1.2484

Note. The three mesh-based methods are run through 100 iterations, while the voxel-based method needs 200 iterations.