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Table 1 Functions to approximate PSF shape parameters

From: Signal processing in urodynamics: towards high definition urethral pressure profilometry

PSF shape parameter Depends on model parameters Approximation
\(a_1\) D Polynomial (degree 1)
\(a_2\) D, \(\nu\) Bilinear interpolation
\(a_3\) D, \(\nu\) Bilinear interpolation
\(a_4\) D Cubic interpolation
\(\alpha\) D Polynomial (degree 4)
\(\beta\) D, \(\nu\) Rational polynomial along D (degree 2/2), linear interpolation along \(\nu\)