Hi,
You can also use midtrans to derive a transformation to the mid-space for any number of transformations.
This either needs you to pick one as an initial reference or to use a template. In your case I'd arbitrarily pick one as a reference and then use it like this:
midtrans -o C2mid.mat A2C.mat B2C.mat ident.mat
where this is an example for 3 images, and you'll need to extend to 6 (just put in the five transformations to the chosen reference plus the identity matrix). You can then either get out one transformation from the chosen reference to the mid-space (as shown here) or a separate matrix for each image, taking it directly to the mid-space (using the --separate option).
Hope this does what you want.
All the best,
Mark
On 15 Jan 2013, at 21:01, Andreas Bartsch <[log in to unmask]> wrote:
> Hi,
> you can try Martin Reuter's mri_robust_template (part of FreeSurfer).
> Cheers,
> Andreas
>
> Am 15.01.13 21:50 schrieb "Brett Harton" unter <[log in to unmask]>:
>
>> Hello,
>>
>> I have a subject who I collected DTI data on at six time points. This
>> question was brought up in an earlier post, but did not appear to get
>> answered. Is there a way to perform a halfway transform for more than
>> two time points so that all FA maps can be registered in the same space?
>> Normalization to a template is not an option for this patient. I've
>> tried using Baseline as the Reference image, week 1 as the input image,
>> and the other weeks as secondary images and applying the halfway
>> transform to all of the weeks but this does not seem to do the trick.
>> I've also tried registering each of the consecutive weeks to the baseline
>> image and used each week's halfway forward transform, but that doesn't
>> seem to work either. Any suggestions/solutions would be greatly
>> appreciated.
>>
>> Brett
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