[Insight-users] How to set the fixed image region in the registration framework v4 ?

[Tim Allman]

This is interesting. I get the same problem with the non-v4 version of 
MeanSquaresImageToImageMetric but it goes away if I set the number of 
threads to 1. It might be worth a try to see if this cures your problem too.

Tim

On 13-01-21 03:58 AM, Champ Frédéric wrote:
> Hi,
>
> I'm working on a slice-by-slice registration method for diffusion MRI. 
> The method works with the registration framework but the 
> itk::MattesMutualInformationImageToImageMetric (which gives best 
> results) is not thread safe.
>
> I tried to optimize this method be using the framework v4 but I get 
> some problems.
> To compute a slice-by-slice registration, In the old framework I set 
> the current slice as the fixed image region at each iteration. In the 
> new framework, this region is used to create the mask of fixed image 
> set in the metric (It's the only way I found to specify the image 
> region...) but it doesn't work and returns the following message:
>
> Description: itk::ERROR: 
> MattesMutualInformationImageToImageMetricv4(0x7f7eb004b360): *Too many 
> samples map outside moving image buffer. There are only 4 valid points 
> out of 471 total points*. The images do not sufficiently overlap. They 
> need to be initialized to have more overlap before this metric will 
> work. For instance, you can align the image centers by translation.
>
> However if I don't set any mask the registration works but it 
> registers the whole volume...
> I tried to use the same Image as the fixed and moving one (expecting 
> an overlap) or to use fixed sample point sets but in both cases I had 
> the same error message.
> Did I missed some step ? Is there any way to specify the fixed region ?
>
> Thanks,
>
> Fred
>
>
>
>
>
>
>
>
>
> _____________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Kitware offers ITK Training Courses, for more information visit:
> http://www.kitware.com/products/protraining.php
>
> Please keep messages on-topic and check the ITK FAQ at:
> http://www.itk.org/Wiki/ITK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.itk.org/mailman/listinfo/insight-users

-- 
Tim Allman, Ph.D.
35 Margaret Street,
Guelph Ontario N1E 5R6
Canada

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.itk.org/pipermail/insight-users/attachments/20130121/bb3befde/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: dr_tim_allman.vcf
Type: text/x-vcard
Size: 159 bytes
Desc: not available
URL: <http://www.itk.org/pipermail/insight-users/attachments/20130121/bb3befde/attachment.vcf>