PET plasma time-activity curves model. fit_feng is a non-linear fitting of the model suggested by Feng et al to PET plasma time-activity curves.
Datafile can be any DFT file which can include weights. Program writes the fit start and end times, nr of points, WSS/n, and parameters (p1, p2, p3, p4, p5, p6, tau) of the fitted function to the FIT file.

Usage: fit_feng [Options] <Datafile> <FIT file>

Options:
-wf
Weight by sampling interval
-ext[ended] or -simpl[ified]
Apply extended model (one extra exponential term with two more parameters) or simplified model (p5 and p6 fixed to zero)
-ss
Function approaches steady level; last exponent term is a constant, i.e. either p6 or p8 is 0
-delay=<<value>|mean|median>
Delay time (tau) is constrained to specified value or to mean or median of all TACs
-fast or -safe
Speed up the fitting but increase the chance of failure, or increase the reliability at the cost of computing time
-fit=<Filename>
Fitted TACs are written in DFT format
-svg=<Filename>
Fitted and measured TACs are plotted in specified SVG file
-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 lots of information about what it is doing

The license of this software is Freeware, you can free download and free use this calculator software.