Hi Gwenaelle,
and thanks a lot for sharing this valuable info. I don't have a particular
reason, except I thought that there, actually could be enough contrast in
nodif. It seems I could be wrong, as your experiences show. I am going to
give a try to FA. Thanks again.
cheers,
Martin
On Sat, 3 Nov 2007, Gwenaëlle DOUAUD wrote:
> Hi Martin,
>
> is there any reason why you would like particularly to
> use b0 instead of FA?
> My experience with different non-linear registrations
> is that they don't handle very nicely the nodif to T1
> trasnformation as there is not a sufficient contrast
> in the nodif images (once again with my own,
> non-methodological words!). If you have the
> possibility, I suggest to swap to FA maps instead...
>
> Cheers,
> Gwenaëlle
>
>
> --- Martin Kavec <[log in to unmask]> a écrit :
>
>> Hi Steve,
>>
>> coincidentally I work on similar problem as
>> Gwenaelle, but registering
>> nodif to anatomical mprage. Even if I use input
>> parameters from $DR which use
>> NMI as a cost function for both affine and nonlinear
>> registrations, the
>> results are not OK. The affine registration look
>> very good, but the
>> nonrigid looks as if everything around ventricles
>> and corpus callosum was
>> squashed. I am not sure what parameter(s) should I
>> change to improve it.
>> It seems as the nonrigid deformation is dominated by
>> a low frequency
>> component. Would you have any recommendation?
>>
>> cheers,
>>
>> Martin
>>
>> On Sat, 3 Nov 2007, Steve Smith wrote:
>>
>>> Hi - if you want to register an FA to a structural
>> you would need to use
>>> different areg/nreg settings so that you use one
>> of the intermodal cost
>>> functions - that's probably why this isn't working
>> well, as at present you
>>> are using a intra-modal cost function.
>>>
>>> Cheers, Steve.
>>>
>>>
>>>
>>> On 2 Nov 2007, at 23:13, Bhargav Kumar Errangi
>> wrote:
>>>
>>>> Hello Gwenaelle,
>>>> I tried registering the diffusion data to
>> structural data using nreg. But
>>>> the result looks weird to me. Iam uploading the
>> structural , FA and
>>>> transformation matrix along with the transformed
>>>> image(FA2Structural.nonlinear).The reference
>> number is 735629.Please, look
>>>> into this as iam not sure about what happened to
>> the image. Also, i would
>>>> like to mention that the transformed image still
>> has the resolution of the
>>>> FA image.
>>>> Thank you,
>>>> Bhargav.
>>>
>>>
>>>
>>
> ---------------------------------------------------------------------------
>>> Stephen M. Smith, Professor of Biomedical
>> Engineering
>>> Associate Director, Oxford University FMRIB
>> Centre
>>>
>>> FMRIB, JR Hospital, Headington, Oxford OX3 9DU,
>> UK
>>> +44 (0) 1865 222726 (fax 222717)
>>> [log in to unmask]
>> http://www.fmrib.ox.ac.uk/~steve
>>>
>>
> ---------------------------------------------------------------------------
>>
>
>
>
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