[Insight-users] problems on deformable registration 8

[Luis Ibanez]

Hi Sean,


The Exception

              itk::InvalidRequestedRegionError


doesn't seem to be related to the registration process.


A) Did you make *any* changes to the source code
    of the DeformableRegistration8.cxx example ?


B) How are you reading your images ?
    Are they DICOM files ?
    Are you using a Series Reader ?


C) How *exactly* have you been removing slices from them.


D) 2Gb of RAM should be enough for registering two images of
    64 slices with 256x256 pixels each.




Something else is going on here....



    Please let us know about (A),(B) and (C)



       Thanks



         Luis





------------------
Sean lee wrote:
> Hi, Luis,
> 
> Thank you for your reply.
> 
> I have 2GB RAM. Here is the error message if I run more than 62 slices: 
> Unhandled exception at 0x7c812afb in RegTest.exe: Microsoft C++ 
> exception: itk::InvalidRequestedRegionError at memory location 0x0013fbbc..
> 
> My CT volumes are liver images from two different phases. 
> 
> I also did another test on these two volumes by switch them (switch 
> fixed and moving volumes). If I run 62 slices,, it would come with same 
> memory problem (see above error message). This time if I run 60 slices, 
> it would reach "CONVERGENCE: REL_REDUCTION_OF_F <= FACTR*EPSMCH" after 
> one iteration; but it seems 59 slices allow me to run 34 iterations and 
> gave me a good result.
> 
> So, it seems the good results came with "reach Projected Gradient 
> Tolerance". If it reaches "CONVERGENCE: REL_REDUCTION_OF_F <= 
> FACTR*EPSMCH" first, it come with a "bad" result. How can I control this 
> situation?
> 
> Thanks.
> 
> Sean
> 
>  > Date: Wed, 8 Jul 2009 17:39:25 -0400
>  > From: luis.ibanez at kitware.com
>  > To: kevinseanlee at live.com
>  > CC: insight-users at itk.org
>  > Subject: Re: [Insight-users] problems on deformable registration 8
>  >
>  >
>  > Hi Sean,
>  >
>  > This is very suspicious.
>  >
>  >
>  > A) your images do not seem to be that big...
>  >
>  > One image of:
>  >
>  > 64 slices of 256 x 256 in 16bits
>  >
>  > will take 8 Mb
>  >
>  >
>  > How much RAM do you have ?
>  >
>  >
>  > B) Just removing one slice (out of 60) from your
>  > dataset shouldn't lead the registration to
>  > behave differently.
>  >
>  >
>  > Unless...
>  >
>  > There is some special content in that slice...
>  >
>  > Are any objects in Slice 60 that have very
>  > different intensities to those objects visible
>  > in slice 59 ?
>  >
>  >
>  > ...and...
>  >
>  >
>  > C) How are you removing that slice ?
>  >
>  > Are you using a region of interest extraction first ?
>  >
>  >
>  >
>  >
>  > Please let us know,
>  >
>  >
>  > Thanks
>  >
>  >
>  >
>  > Luis
>  >
>  >
>  >
>  > ---------------
>  > Sean lee wrote:
>  > > Hello,
>  > >
>  > > I am trying to use the example of deformable registration 8 on two ct
>  > > image volumes (64 256X256 slices). The problem is If i use more 
> than 62
>  > > slices, I would have memory problem; I run 60 slice, I got a perfect
>  > > results with 20 iterations; but if I run 59 slices, it only run one
>  > > iteration and reaches "CONVERGENCE: REL_REDUCTION_OF_F <= 
> FACTR*EPSMCH".
>  > > I tried to reduce the Cost Function Convergence Factor to 1e+1 and it
>  > > still comes same results. What could be the problem and any suggested
>  > > solutions? Thanks. Sean
>  > > >
>  > >
>  > > 
> ------------------------------------------------------------------------
>  > >
>  > > _____________________________________
>  > > Powered by www.kitware.com
>  > >
>  > > Visit other Kitware open-source projects at
>  > > http://www.kitware.com/opensource/opensource.html
>  > >
>  > > 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
> 
> ------------------------------------------------------------------------
> Windows Live™ SkyDrive™: Get 25 GB of free online storage. Get it on 
> your BlackBerry or iPhone. 
> <http://windowslive.com/online/skydrive?ocid=TXT_TAGLM_WL_SD_25GB_062009>