Usage
T2.lm(signal, TE, guess, control=minpack.lm::nls.lm.control())
## S3 method for class 'array':
T2.fast(cpmg, cpmg.mask, TE,
control=minpack.lm::nls.lm.control(maxiter=150),
multicore=FALSE, verbose=FALSE)Arguments
signal
is the vector of signal intensities as a function of
echo times.
TE
is the vector of echo times (in seconds).
guess
is the vector of initial values for the parameters of
interest: $\rho$ and $T2$.
control
An optional list of control settings for nls.lm.
See nls.lm.control for the names of the settable control
values and their effect.
cpmg
is a multidimensional array of signal intensities. The
last dimension is assumed to be a function of the echo times, while
the previous dimenions are assued to be spatial.
cpmg.mask
is a (logical) multidimensional array that
identifies the voxels to be analyzed.
multicore
is a logical variable (default = FALSE) that
allows parallel processing via multicore. verbose
is a logical variable (default = FALSE) that
allows text-based feedback during execution of the function.