cpmg: Quantitative T2
In dcemriS4: A Package for Medical Image Analysis (S4 implementation)

Description Usage Arguments Details Value Author(s) See Also Examples

...

T2.lm(signal, TE, guess, control=nls.lm.control())
## S4 method for signature 'array'
T2.fast(cpmg, cpmg.mask, TE, control=nls.lm.control(maxiter=150),
         multicore=FALSE, verbose=FALSE)

`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.