[Camino-users] Fitting analytic models (choosing number of restricted compartments)

[Eleftheria Panagiotaki]

Hi Andres,

You can synthesize any number of compartments that you want to define with
*datasynth*, but you can only fit the ones listed in the Panagiotaki et al
NeuroImage 2012 paper with *modelfit*.

Best,

Laura


On 15 January 2014 21:57, Andrés Méndez <andres.mendezg at gmail.com> wrote:

> Thanks for the answer.
>
> So I cannot define, for example   "modelfit -  TENSORTENSORCYLINDER"  to
> fit the signal combining two tensors and a cylinder?
>
>
> In the way that ballstickstick are combined in the following example to
> synthetize the signal from a crossing fiber
>
>
> datasynth -synthmodel  compartment 3 BALL 0.4 1.7E-9  Stick 0.3 1E-9 1.2 -4.5 Stick 1E-9 0.0 0.0 -schemefile cross.scheme -voxels 1 -outputfile BSScross.Bfloat
>
>
>
>
>
>
> _______________________________________________
> C. Andrés Méndez G.,   Postdoctoral Research Fellow
> Department of Computer Science, University of Verona
> Ca' Vignal 2 - Strada Le Grazie 15,  37134 VERONA - Italy
> Tel. +39 045 802 7803
>
>
> On Wed, Jan 15, 2014 at 6:47 PM, Ferizi, Uran <uran.ferizi.10 at ucl.ac.uk>wrote:
>
>>  Hello Andrés,
>>
>>
>>  No, in short, it is not possible at present to model many fibers (by
>> the way, modelled through restricted diffusion via Cylinders, and not
>> Tensors).
>>
>>
>>  We intend to produce a more versatile model soon, which would cater for
>> this sort of problem, but that would be a few months away.
>>
>>
>>  Uran
>>
>>
>>  ------------------------------
>> *From:* camino-users-bounces at www.nitrc.org <
>> camino-users-bounces at www.nitrc.org> on behalf of Andrés Méndez <
>> andres.mendezg at gmail.com>
>> *Sent:* 15 January 2014 12:00 PM
>> *To:* camino-users at www.nitrc.org
>> *Subject:* [Camino-users] Fitting analytic models (choosing number of
>> restricted compartments)
>>
>>  Hello, I'd like to ask a question about data fitting and data synthesis
>> using analytic models.
>>
>>  Is it possible to fit the data specifying the number N of restricted
>> compartments?. For example, the CHARMED model that in Camino is codified as
>> "Tensor GDRCylinders".  Let's say I want to fit a single hindered
>> compartment (Cylinders) and two restricted diffusion ones (Tensor) in order
>> to account for crossing fibers . Is it possible to do it?
>>
>>  Thanks in advance. Regards.
>>
>>  Andrés M.
>>
>>
>>
>>  _______________________________________________
>>
>>
>>
>
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>
>


-- 
   --------------------------------------------------
    Eleftheria Panagiotaki
    Centre for Medical Image Computing
    University College London
    Gower Street, London WC1E 6BT,
    United Kingdom
    Email: panagio at cs.ucl.ac.uk
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