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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