Description Usage Arguments Value
Fits the one-tissue compatment 82-rubidium model
implemented in lortie.model
.
1 2 3 4 5 6 7 | lortie.fit(input.function, tissue, time.start, time.end,
a = 0.77, b = 0.63, FLV.start = 0.1, FLV.lower = 0,
FLV.upper = 1, flow.start = 0.5, flow.lower = 0,
flow.upper = 8, k2.start = 0.1, k2.lower = 0,
k2.upper = 8, left.ventricle = input.function,
weight = time.end - time.start, plot = FALSE,
interpolation.type = 1, ...)
|
input.function |
Input function TAC (typically, left ventricle). |
tissue |
Tissue (myocardium) TAC. |
time.start |
Initial time for each frame (in minutes). |
time.end |
End time for each frame (in minutes). |
a |
Parameter |
b |
Parameter |
FLV.start,flow.start,k2.start |
Initial parameter values for the non-linear squares fitting. |
FLV.lower,flow.lower,k2.lower |
Lower bounds. |
FLV.upper,flow.upper,k2.upper |
Upper bounds. |
left.ventricle |
Left ventricle TAC, used for
spill-over corretion. Defaults to
|
weight |
Weights for the non-linear least squares. Defaults to frame length. |
plot |
Should the results be plotted. Defaults to
|
interpolation.type |
Interpolation type selection.
Passed to |
... |
If plotting is used, optional parameters are passed to the plot function. |
Returns a list with three fields: kparms
, the
computed kinetic parameters; stderrors
, the
standard errors for each parameter as a percentage;
fit
, the actual fitted object.
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