fit_exp 2.8.2 © 1994-2012 by Turku PET Centre

Non-linear fitting of the sum of 1-3 exponential functions to plasma and tissue time-activity curves (TACs). Function: f(x) = p1*exp(p2*x) + p3*exp(p4*x) + p5*exp(p6*x) Usage: fit_exp [Options] <TAC file> [Fit or Result file] General options: -h or --help Print this message and exit --version or --build Print software build information and exit --silent Program works silently, printing only error and warning messages --verbose Program prints more information about what it is doing. Options for selecting the exponential function; selection between 1-3 exponentials can also be made by renaming the executable as fit_3e, fit_2e or fit_1e : -3[e] Sum of three exponentials (default) -2[e] Sum of two exponentials -1[e] Single exponential function -nonneg p1, p3 and p5 are constrained to values >= 0 -expneg p2, p4 and p6 are constrained to values <= 0. Other options: -starttime=<<Time (min)>|Peak> Set the sample time from where fitting is started (0 by default), or 'peak' to start fitting from common peak time -endtime=<Time (min)> Set the sample time where fitting is stopped (last sample by default) -fit=<Filename> Fitted TACs are written in DFT format -svg=<Filename> Fitted and measured TACs are plotted in specified SVG file -autoname Names for fit file and fitted TAC file are set automatically -w1 All weights are set to 1.0 (no weighting) -wf Less frequent samples are given more weight. TAC file must be in DFT format (1). Function parameters are written in fit (2) or result (3) format, depending on filename extension (.fit or .res). References: 1. http://www.turkupetcentre.net/analysis/doc/format_dft.html 2. http://www.turkupetcentre.net/analysis/doc/format_fit.html 3. http://www.turkupetcentre.net/analysis/doc/format_res.html See also: fit_fexp, fit_ratf, fit_hiad, fit2dat, extrapol, paucinf, dftcut Keywords: DFT, input, simulation, extrapolation This program comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to redistribute it under GNU General Public License.