fit_dexp - tpcclib 0.7.3 © 2019 by Turku PET Centre

Non-linear fitting of the sum of 1-5 exponential functions to decaying
time-activity curve (TAC).
  f(x) = a1*exp(k1*x) + a2*exp(k2*x) + a3*exp(k3*x) + ...
, where a's > 0 and k's < 0.
Usage: fit_dexp [Options] tacfile parfile
 -5 | -4 | -3 | -2 | -1
     Fit to sum of specified number of exponential functions; by default
     determined automatically.
     All weights are set to 1.0 (no weighting); by default, weights in
     data file are used, if available.
     Weight by sampling interval.
     Fitted and measured TACs are plotted in specified SVG file.
     Number of basis functions, used in determination of initial parameter
     estimates and number of exponentials for nonlinear fitting;
     default is 100.
 -peak | -peak1
     Fit is started only at the TAC peak, or at the next sample after peak.
 -h, --help
     Display usage information on standard output and exit.
 -v, --version
     Display version and compile information on standard output and exit.
 -d[n], --debug[=n], --verbose[=n]
     Set the level (n) of debugging messages and listings.
 -q, --quiet
     Suppress displaying normal results on standard output.
 -s, --silent
     Suppress displaying anything except errors.
If TAC file contains more than one TAC, only the first is used.
Function parameters are written in fit format.
See also: fit_exp, fit_fexp, fit_ratf, fit2dat, extrapol, paucinf, tacln
Keywords: TAC, curve fitting, extrapolation