extrapol - tpcclib 0.7.3 © 2019 by Turku PET Centre
Extrapolation of the decreasing tail of PET input curve to given time.
This is accomplished by fitting line to the end-part of the plot of the
natural logarithm of tracer concentration against time.
This approach may be applied to TACs which approach zero; thus this
works best for metabolite-corrected input TACs, and cannot be used with
tracers with very slow clearance, such as radiowater.
Usage: extrapol [Options] inputfile time outputfile
-e[nd]=<Fit end time>
Start the search to fit end time; by default, the search for the best
line fit is started from the last sample.
-minnr=<Minimum nr of samples>
Set the minimum number of samples used in searching the best fit;
by default 3.
-maxnr=<Maximum nr of samples>
Set the maximum number of samples used in searching the best fit;
by default all samples.
Set a minimum time range used in searching the best fit.
Measured and extrapolated TACs are plotted in specified SVG file.
Display usage information on standard output and exit.
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.
Suppress displaying normal results on standard output.
Suppress displaying anything except errors.
Input TAC file must contain a time column, and one or more concentration
columns. The extrapolation time must be given in same units as are the sample
times in the datafile.
See also: paucinf, avgbolus, fit_meb, fit_exp, fit_feng, fit2dat, tacln
Keywords: input, plasma, TAC, modelling, simulation