fit_ratf 2.3.0 © 1996-2005 by Turku PET Centre

Non-linear fitting of 1st-3rd degree rational function to PET plasma and tissue time-activity curves (TACs). Function: (Fixed parameters: p1=0, p2=1) p1 + p3*x + p5*x^2 + p7*x^3 f(x) = --------------------------- p2 + p4*x + p6*x^2 + p8*x^3 Usage: fit_ratf [Options] <Data file> [<Fit file> [Fitted data]] Options for selecting the rational function: -p3p3 3rd degree plonymial/3rd degree polynomial (default) -p3p2 3rd degree plonymial/2nd degree polynomial -p2p2 2nd degree plonymial/2nd degree polynomial -p2p1 2nd degree plonymial/1st degree polynomial -p1p1 1st degree plonymial/1st degree polynomial Function can also be selected by renaming the program executable as fit_p3p2, fit_p2p2, fit_p2p1 or fit_p1p1. Program writes the fit start and end times, nr of points, WSS/n, and parameters (p1, p2, ...) of the fitted function to the fit file, in format: http://www.turkupetcentre.net/analysis/doc/format_fit.html See also: fit2dat, extrapol Keywords: DFT, input, simulation