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Hi Tim,<br>
<br>
- In your case the thread must be set to 1 as the<b> non-v4 version
seems to be not thread safe</b>.<br>
- My problem is different: I want a thread safe slice-by-slice
registration method by using the registration frame work v4 but I <b>I
can't specify the fixed image region as a slice without an execution
error</b> (e.g. my previous message).<br>
<br>
Fred<br>
<br>
Le 21/01/2013 17:58, Tim Allman a écrit :
<blockquote cite="mid:50FD73AD.5040504@gmail.com" type="cite">
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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.<br>
<br>
Tim<br>
<br>
<div class="moz-cite-prefix">On 13-01-21 03:58 AM, Champ Frédéric
wrote:<br>
</div>
<blockquote cite="mid:50FD033F.3050504@unistra.fr" type="cite">
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Hi,<br>
<br>
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.<br>
<br>
I tried to optimize this method be using the framework v4 but I get
some problems.<br>
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:<br>
<br>
Description: itk::ERROR:
MattesMutualInformationImageToImageMetricv4(0x7f7eb004b360): <b>Too
many samples map outside moving image buffer. There are only 4 valid
points out of 471 total points</b>. 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.<br>
<br>
However if I don't set any mask the registration works but it registers
the whole volume...<br>
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.<br>
Did I missed some step ? Is there any way to specify the fixed region ?<br>
<br>
Thanks,<br>
<br>
Fred<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
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<pre class="moz-signature" cols="72">--
Tim Allman, Ph.D.
35 Margaret Street,
Guelph Ontario N1E 5R6
Canada
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