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. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: Comput Model Eng Sci. 2011;72(1):53–77.

Table 1.

R2 values of the least-squares fitting results using the four growth functions. (x-in, y-in) are coordinates of inner (lumen) boundary points. (x-out, y-out) are coordinates of out boundary points.

GF Feature x-in y-in x-out y-out
GF1 x, y 0.994228 0.996873 0.998681 0.999154
GF2 (x,y) + σ 0.995197 0.998232 0.999215 0.999476
GF3 (x,y) + τ 0.997174 0.998164 0.999146 0.999423
GF4 (x,y) + σ + τ 0.997737 0.999088 0.999540 0.999696