metab_sigmoid_model: Sigmoid Model for Parent Fraction

In mathesong/kinfitr: Kinetic Modelling of PET Time Activity Curves

Sigmoid Model for Parent Fraction

Description

This is the model function for fitting of the sigmoid function by Guo et al. (2013).

Usage

metab_sigmoid_model(time, a, b, c, ppf0 = 1, delay = 0)

Arguments

time	Time in seconds.
a	Parameter A.
b	Parameter B.
c	Parameter C.
ppf0	The starting point of the parent fraction curve.
delay	The delay of the metabolism curve.

Value

Predicted values

References

Guo Q, Colasanti A, Owen DR, et al. Quantification of the specific translocator protein signal of 18F-PBR111 in healthy humans: a genetic polymorphism effect on in vivo binding. J Nucl Med 2013; 54: 1915–1923.

Examples

metab_sigmoid_model(seq(0, 60 * 60, by = 120), 7, 0.6, 0.04, 1, 0)

mathesong/kinfitr documentation built on Jan. 15, 2024, 11:07 p.m.