[Insight-users] RE: Error: jointPDFSum == 0!

[Miller, James V (Research)]

George, 

What is the origin of the other image? 

It looks like the origin of one image is [0, 0, -1264.5].

Your transform is probably initially the identity, resulting in
an assumption that the two image set overlap in physical space
(meaning if you laid out the two images pinned down at their
respective origins, and the sizes of the image took into account
the spacing of the pixels, then the two images would overlap).

Whenever you get the message 

Too many samples map outside moving image buffer: 0 / 10000

It means the fixed and moving image are not overlapping (after the
application of the current transform).  A set of points is selected 
in on of the images and mapped through the transform to identify
locations in the other image.  If the mapping puts all the samples
outside the other image, then an exception occurs.

If you "know" the images are supposed to span the same region 
of anatomy, then the two image series may simply have had different
landmarks prescribed during acquisition.  In this case, you can either
set the initial transformation to be a translation of 

	movingImageReader->GetOutput()->GetOrigin() -
fixedImageReader->GetOutput()->GetOrigin()

or you can use the ChangeInformationImageFilter to override the origin of
one of the images.

Jim




-----Original Message-----
From: Li, George (NIH/NCI) [mailto:ligeorge at mail.nih.gov]
Sent: Wednesday, December 08, 2004 10:08 AM
To: 'Miller, James V (Research)'; 'insight-users at itk.org'
Subject: RE: [Insight-users] RE: Error: jointPDFSum == 0!


Jim:

Thanks for the tip to print out the image. Here is the print
out content about the image and the exception. Maybe it will
give a clue to what has gone wrong. This time, the exception
seems thrown out a bit earlier in the GetValue() method. It
complains "Too many samples map outside moving image buffer"
at the end.


Argument[1]: ..\ITK_Data\PQ_HDR_VR-vr
Argument[2]: ..\ITK_Data\PQ_HDR_VR-vr

Now reading series:

2.16.840.1.113662.2.2534022882858481901029150326.1
Image (0166FE68)
  RTTI typeinfo:   class itk::Image<unsigned short,3>
  Reference Count: 1
  Modified Time: 2805
  Debug: Off
  Observers:
    none
  Source: (0166DA80)
  Source output index: 0
  Release Data: Off
  Data Released: False
  Global Release Data: Off
  PipelineMTime: 1447
  UpdateMTime: 2806
  LargestPossibleRegion:
    Dimension: 3
    Index: [0, 0, 0]
    Size: [512, 512, 43]
  BufferedRegion:
    Dimension: 3
    Index: [0, 0, 0]
    Size: [512, 512, 43]
  RequestedRegion:
    Dimension: 3
    Index: [0, 0, 0]
    Size: [512, 512, 43]
  Spacing: [0.742188, 0.742188, 10]
  Origin: [0, 0, -1264.5]
  PixelContainer:
    ImportImageContainer (0166FF80)
      RTTI typeinfo:   class itk::ImportImageContainer<unsigned long,
unsigned short>
      Reference Count: 1
      Modified Time: 1515
      Debug: Off
      Observers:
        none
      Pointer: 0166FFB0
      Container manages memory: true
      Size: 11272192
      Capacity: 11272192

ExceptionObject caught !

itk::ExceptionObject (0104FBE4)
Location: "Unknown"
File: C:\Programming\ITK_1.8.0\InsightToolkit-1.8.0\Code\Algorithms\
itkMattesMutualInformationImageToImageMetric.txx
Line: 623
Description: itk::ERROR:
MattesMutualInformationImageToImageMetric(01667B50): 
Too many samples map outside moving image buffer: 0 / 10000


I checked the origin with another image series, it has all 
zero value but with the same exception, so the negative z0
should not be the cause.

Any idea about "Too many samples map outside moving image 
Buffer"?

Thanks,

George




-----Original Message-----
From: Miller, James V (Research) [mailto:millerjv at crd.ge.com] 
Sent: Tuesday, December 07, 2004 2:49 PM
To: Li, George (NIH/NCI); 'insight-users at itk.org'
Subject: RE: [Insight-users] RE: Error: jointPDFSum == 0!


George, 

Are the images being read in correctly?  After you do a
fixedImageReader->Update(), can you print out the image

	fixedImageReader->GetOutput()->Print(std::cout);

(and the same for the moving image) to make sure the images have the proper
resolution?

Jim

-----Original Message-----
From: Li, George (NIH/NCI) [mailto:ligeorge at mail.nih.gov]
Sent: Tuesday, December 07, 2004 1:48 PM
To: 'insight-users at itk.org'
Subject: [Insight-users] RE: Error: jointPDFSum == 0!


BTW, even if I used the identical dicom image series
for both fixedImage and movingImage, this problem is
still there. In this case, jointPDFSum must equal to
1.0. So, it shouldn't be image data related problem,
unless the data is not read properly or completely.

As a matter of fact, I think jointPDFSum is assigned
by a value that is not initialized, because in VC6++
debug tool, jointPDFSum value is 1.#QNAN00000000000. 

Anyone can help me with this?

Thanks,

George


>>

Hi, Luis and insight users:

I did a test to combine two examples together and
see how image registration can be applied to 3D
image series. Enclosed please find my code for the
registration of 3D image series.

Basically, I used the ImageRegistration4.cxx as the
major code but replaced the image reading part with corresponding code in
DicomSeriesReadImageWrite.cxx.

Unfortunately, I got an exception that is related a
zero sum for the jointPDFSum, which supposed to be 1,
inside itkMattesMutualInformationImageToImageMetric::
GetValue().

What could be done wrong here? Is there extra things 
need to be done for the image series, comparing with 
single image file?

Thanks a lot.

George

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