Hi Mark,
You only get weighted least squares in dtifit if you use the -w or --wls
options, right?
That is, the default is ordinary least squares, right?
cheers,
-MH
--
Michael Harms, Ph.D.
-----------------------------------------------------------
Conte Center for the Neuroscience of Mental Disorders
Washington University School of Medicine
Department of Psychiatry, Box 8134
660 South Euclid Ave. Tel: 314-747-6173
St. Louis, MO 63110 Email: [log in to unmask]
On 10/30/12 10:52 AM, "Mark Jenkinson" <[log in to unmask]> wrote:
>Hi,
>
>To answer your other specific questions:
>
>> - Does it mean that FSL uses for eddy current correction a
>>slice by slice correction (not a whole brain global affine
>
>FSL (i.e. eddy_correct) does _not_ do slice by slice correction. It
>_does_ use a whole brain global affine correction. Essentially it just
>runs FLIRT with 12 DOF, so referencing FLIRT is also worth doing.
>
>> - Manginšs paper describes the Geman-McLure M-estimator
>>algorithm for the diffusion tensor estimation. Does FSL use this
>>algorithm?
>
>Within the eddy current correction there is no diffusion tensor
>estimation. It does weighted linear least squares inside dtifit.
>
>All the best,
> Mark
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