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Tracing fibers requires computation of weighted averages of tensor fields within the filter radius (1-3 voxel sizes) and finding tensor eigenvalues and eigenvectors on every step. These are the most expensive computations in the algorithm and are performed using SVD decomposition and LU factorization using routines from [Press et al. 1992]. We employ standard Euler and Runge-Kutta forward integration scheme [Press et al. 1992] to evaluate the line integrals in tracing procedure.

Leonid Zhukov 2003-09-10