Re: [Teem-users] Non-linear least squares tensor estimates...

[Gordon L. K. <gl...@uc...>]

Its sad that such an old page <http://wiki.na-mic.org/Wiki/index.php/NAMIC_Wiki:DTI:TeemExamples 
 > is still accurate.  Completing the implementation of the non-linear  
estimation has never been on anyone's critical path, or something like  
that.

However, this page <http://wiki.na-mic.org/Wiki/index.php/NAMIC_Wiki:DTI:Nrrd_format 
 > documents how to specify non-equal b values in the Nrrd header; and  
these can be used as part of the log-linear fitting, and I believe  
that implementation is reliable.

Gordon

On Feb 17, 2011, at 5:34 PM, Daniel Ennis wrote:

> Hi All - We are considering moving to non-linear least squares methods
> for tensor estimation, but noticed the "disclaimer" on the NAMIC wiki:
>
> "The API used by this code (in the "ten" library of Teem) also
> includes methods for non-linear-least squares and
> weighted-least-squares, but these are not stable and reliable enough
> to be advertised at this point."
>
> Is that advice current?  Any tips for proceeding?  We have numerous
> directions and non-constant (but nearly constant) b-values.
>
> Best,
>
>            -Dan-
>
> -- 
> Daniel B. Ennis, Ph.D.
> Assistant Professor
> University of California,  Los Angeles
> David   Geffen   School   of   Medicine
> Department of Radiological Sciences
> Diagnostic   Cardiovascular   Imaging
>
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